diff --git a/bot_bottle/agent_provider.py b/bot_bottle/agent_provider.py
index 28f380d..4a5e01a 100644
--- a/bot_bottle/agent_provider.py
+++ b/bot_bottle/agent_provider.py
@@ -3,18 +3,32 @@
 The manifest owns the user-facing AgentProvider shape. This module is
 the launch-time table that turns a provider template into an executable
 command, default image, and prompt/auth behavior.
+
+Per PRD 0050 the per-provider implementations live under
+`bot_bottle/contrib/<template>/agent_provider.py`. This module exposes:
+
+  - `AgentProvider` (ABC) — the contract each plugin implements.
+  - `get_provider(template)` — lazy-imported registry; the analogue
+    of `bot_bottle/deploy_key_provisioner.get_provisioner`.
+  - `AgentProvisionPlan` (+ helper dataclasses) — declarative shape
+    each provider produces and the backends consume unchanged.
+  - `agent_provision_plan` / `runtime_for` — thin wrappers around the
+    registry kept so existing callers keep working without per-call
+    edits.
 """
 
 from __future__ import annotations
 
-import json
-import os
+from abc import ABC, abstractmethod
 from dataclasses import dataclass, field
 from pathlib import Path
-from typing import Literal
+from typing import TYPE_CHECKING, Literal
 
-from .codex_auth import codex_host_access_token, write_codex_dummy_auth_file
-from .egress import CODEX_HOST_CREDENTIAL_TOKEN_REF, EgressRoute
+from .egress import EgressRoute
+
+
+if TYPE_CHECKING:
+    from .backend import Bottle, BottlePlan
 
 
 PROVIDER_CLAUDE = "claude"
@@ -96,35 +110,88 @@ class AgentProvisionPlan:
     provisioned_env: dict[str, str] = field(default_factory=dict)
 
 
-_REPO_ROOT = Path(__file__).resolve().parent.parent
+class AgentProvider(ABC):
+    """Per-template plugin: produces the provision plan and applies
+    the provider-specific in-guest setup steps (skills, prompt, the
+    declarative `dirs`/`files`/`pre_copy`/`verify` apply loop, and
+    supervise MCP registration). Concrete subclasses live under
+    `bot_bottle/contrib/<template>/agent_provider.py`."""
+
+    @property
+    @abstractmethod
+    def runtime(self) -> AgentProviderRuntime:
+        """The static command / image / prompt-mode table for this
+        template."""
+
+    @abstractmethod
+    def provision_plan(
+        self,
+        *,
+        dockerfile: str,
+        state_dir: Path,
+        guest_home: str,
+        guest_env: dict[str, str] | None = None,
+        auth_token: str = "",
+        forward_host_credentials: bool = False,
+        host_env: dict[str, str] | None = None,
+        trusted_project_path: str = "",
+    ) -> AgentProvisionPlan:
+        """Build the declarative AgentProvisionPlan for one launch.
+        Backends call this during `prepare` and consume the result as
+        before."""
+
+    @abstractmethod
+    def provision_skills(self, plan: "BottlePlan", bottle: "Bottle") -> None:
+        """Copy each of the agent's named skills from the host into
+        the guest. No-op when the agent has no skills. The in-guest
+        layout is provider-specific (claude-code's
+        `~/.claude/skills/` today; future providers may differ)."""
+
+    @abstractmethod
+    def provision_prompt(self, plan: "BottlePlan", bottle: "Bottle") -> str | None:
+        """Copy the prompt file into the guest, fix ownership/mode,
+        and return the in-guest path iff the agent has a non-empty
+        prompt (drives the `--append-system-prompt-file` flag).
+
+        The file is copied either way so the path always exists."""
+
+    @abstractmethod
+    def provision(self, plan: "BottlePlan", bottle: "Bottle") -> None:
+        """Apply the provider's declarative
+        `dirs`/`pre_copy`/`files`/`verify` steps from
+        `plan.agent_provision`. Was called `provision_provider_auth`
+        on `BottleBackend` before PRD 0050."""
+
+    @abstractmethod
+    def provision_supervise_mcp(
+        self,
+        plan: "BottlePlan",
+        bottle: "Bottle",
+        supervise_url: str,
+    ) -> None:
+        """Register the per-bottle supervise sidecar as an MCP server
+        in the provider's in-guest config. Called by the backend after
+        the supervise sidecar is reachable. No-op when
+        `plan.supervise_plan is None`."""
 
 
-_RUNTIMES = {
-    PROVIDER_CLAUDE: AgentProviderRuntime(
-        template=PROVIDER_CLAUDE,
-        command="claude",
-        image="bot-bottle-claude:latest",
-        dockerfile=str(_REPO_ROOT / "Dockerfile.claude"),
-        prompt_mode="append_file",
-        bypass_args=("--dangerously-skip-permissions",),
-        resume_args=("--continue",),
-        remote_control_args=("--remote-control",),
-    ),
-    PROVIDER_CODEX: AgentProviderRuntime(
-        template=PROVIDER_CODEX,
-        command="codex",
-        image="bot-bottle-codex:latest",
-        dockerfile=str(_REPO_ROOT / "Dockerfile.codex"),
-        prompt_mode="read_prompt_file",
-        bypass_args=("--dangerously-bypass-approvals-and-sandbox",),
-        resume_args=("resume", "--last"),
-        remote_control_args=(),
-    ),
-}
+def get_provider(template: str) -> AgentProvider:
+    """Resolve a provider template name to its plugin instance.
+
+    Lazy-imports the contrib module so importing this module doesn't
+    pull provider-specific code paths in. Mirrors the contrib
+    convention PRD 0048 established for deploy key provisioners."""
+    if template == PROVIDER_CLAUDE:
+        from .contrib.claude.agent_provider import ClaudeAgentProvider
+        return ClaudeAgentProvider()
+    if template == PROVIDER_CODEX:
+        from .contrib.codex.agent_provider import CodexAgentProvider
+        return CodexAgentProvider()
+    raise ValueError(f"unknown agent provider template: {template!r}")
 
 
 def runtime_for(template: str) -> AgentProviderRuntime:
-    return _RUNTIMES[template]
+    return get_provider(template).runtime
 
 
 def agent_provision_plan(
@@ -132,118 +199,24 @@ def agent_provision_plan(
     template: str,
     dockerfile: str,
     state_dir: Path,
-    guest_home: str = "/home/node",
+    guest_home: str,
     guest_env: dict[str, str] | None = None,
     auth_token: str = "",
     forward_host_credentials: bool = False,
     host_env: dict[str, str] | None = None,
     trusted_project_path: str = "",
 ) -> AgentProvisionPlan:
-    runtime = runtime_for(template)
-    resolved_guest_env = dict(guest_env or {})
-    trusted_path = trusted_project_path or guest_home
-    env_vars: dict[str, str] = {}
-    provisioned_env: dict[str, str] = {}
-    dirs: list[AgentProvisionDir] = []
-    files: list[AgentProvisionFile] = []
-    pre_copy: list[AgentProvisionCommand] = []
-    verify: list[AgentProvisionCommand] = []
-    egress_routes: list[EgressRoute] = []
-    hidden_env_names: frozenset[str] = frozenset()
-
-    if template == PROVIDER_CODEX:
-        env_vars["CODEX_CA_CERTIFICATE"] = "/etc/ssl/certs/ca-certificates.crt"
-        auth_dir = resolved_guest_env.get("CODEX_HOME", f"{guest_home}/.codex")
-        if forward_host_credentials:
-            env_vars["CODEX_HOME"] = auth_dir
-        dirs.append(AgentProvisionDir(auth_dir))
-        config_path = f"{auth_dir}/config.toml"
-        config_file = state_dir / "codex-config.toml"
-        toml_path = trusted_path.replace("\\", "\\\\").replace('"', '\\"')
-        config_file.write_text(
-            f'[projects."{toml_path}"]\n'
-            'trust_level = "trusted"\n'
-        )
-        config_file.chmod(0o600)
-        files.append(AgentProvisionFile(config_file, config_path))
-
-        for host in CODEX_HOST_CREDENTIAL_HOSTS:
-            egress_routes.append(EgressRoute(
-                host=host,
-                auth_scheme="Bearer" if forward_host_credentials else "",
-                token_ref=CODEX_HOST_CREDENTIAL_TOKEN_REF if forward_host_credentials else "",
-                tls_passthrough=True,
-            ))
-        if forward_host_credentials:
-            _host_env = host_env or dict(os.environ)
-            provisioned_env[CODEX_HOST_CREDENTIAL_TOKEN_REF] = codex_host_access_token(
-                _host_env,
-            )
-            auth_file = state_dir / "codex-auth.json"
-            write_codex_dummy_auth_file(auth_file, _host_env)
-            files.append(AgentProvisionFile(auth_file, f"{auth_dir}/auth.json"))
-            pre_copy.append(AgentProvisionCommand((
-                "find", auth_dir,
-                "-maxdepth", "1",
-                "-type", "f",
-                "(",
-                "-name", "*.sqlite",
-                "-o", "-name", "*.sqlite-*",
-                "-o", "-name", "*.codex-repair-*.bak",
-                ")",
-                "-delete",
-            ), "codex host credentials: could not reset runtime db files"))
-            verify.append(AgentProvisionCommand((
-                "runuser", "-u", "node", "--",
-                "env",
-                f"HOME={guest_home}",
-                f"CODEX_HOME={auth_dir}",
-                "codex", "login", "status",
-            ), (
-                "codex host credentials: dummy auth was copied into the "
-                "guest, but Codex did not accept it"
-            )))
-    if template == PROVIDER_CLAUDE:
-        env_vars["CLAUDE_CODE_DISABLE_NONESSENTIAL_TRAFFIC"] = "1"
-        env_vars["DISABLE_ERROR_REPORTING"] = "1"
-        claude_config = state_dir / "claude.json"
-        claude_projects = {
-            guest_home: {"hasTrustDialogAccepted": True},
-        }
-        claude_projects[trusted_path] = {"hasTrustDialogAccepted": True}
-        claude_config.write_text(json.dumps({
-            "hasCompletedOnboarding": True,
-            "theme": "dark",
-            "bypassPermissionsModeAccepted": True,
-            "projects": claude_projects,
-        }, indent=2) + "\n")
-        claude_config.chmod(0o600)
-        files.append(AgentProvisionFile(claude_config, f"{guest_home}/.claude.json"))
-        egress_routes.append(EgressRoute(
-            host="api.anthropic.com",
-            auth_scheme="Bearer" if auth_token else "",
-            token_ref=auth_token,
-            tls_passthrough=True,
-        ))
-        if auth_token:
-            env_vars["CLAUDE_CODE_OAUTH_TOKEN"] = "egress-placeholder"
-            hidden_env_names = frozenset({"CLAUDE_CODE_OAUTH_TOKEN"})
-
-    return AgentProvisionPlan(
-        template=template,
-        command=runtime.command,
-        prompt_mode=runtime.prompt_mode,
-        image=runtime.image,
+    """Back-compat shim — `prepare` callers stay the same; the work
+    now lives on the provider plugin."""
+    return get_provider(template).provision_plan(
         dockerfile=dockerfile,
-        env_vars=env_vars,
-        guest_env=resolved_guest_env,
-        dirs=tuple(dirs),
-        files=tuple(files),
-        pre_copy=tuple(pre_copy),
-        verify=tuple(verify),
-        egress_routes=tuple(egress_routes),
-        hidden_env_names=hidden_env_names,
-        provisioned_env=provisioned_env,
+        state_dir=state_dir,
+        guest_home=guest_home,
+        guest_env=guest_env,
+        auth_token=auth_token,
+        forward_host_credentials=forward_host_credentials,
+        host_env=host_env,
+        trusted_project_path=trusted_project_path,
     )
 
 
diff --git a/bot_bottle/backend/__init__.py b/bot_bottle/backend/__init__.py
index 6a50ed4..cc408b7 100644
--- a/bot_bottle/backend/__init__.py
+++ b/bot_bottle/backend/__init__.py
@@ -39,7 +39,7 @@ from dataclasses import dataclass
 from pathlib import Path
 from typing import Any, Generic, Sequence, TypeVar
 
-from ..agent_provider import AgentProvisionPlan
+from ..agent_provider import AgentProvisionPlan, get_provider
 from ..egress import EgressPlan
 from ..git_gate import GitGatePlan
 from ..log import die, info
@@ -76,6 +76,7 @@ class BottlePlan(ABC):
 
     spec: BottleSpec
     stage_dir: Path
+    guest_home: str
     git_gate_plan: GitGatePlan
     egress_plan: EgressPlan
     supervise_plan: SupervisePlan | None
@@ -320,24 +321,33 @@ class BottleBackend(ABC, Generic[PlanT, CleanupT]):
         to decide whether to add provider-specific prompt args to the
         agent's argv.
 
-        Default orchestration: ca → prompt → skills → workspace → git →
-        supervise. CA install runs first so the agent's trust store
-        is rebuilt before anything inside the agent makes a TLS call.
-        Subclasses typically don't override this; they implement the
-        sub-methods below.
+        Default orchestration: ca → prompt → provider apply → skills
+        → workspace → git → supervise-mcp. CA install runs first so
+        the agent's trust store is rebuilt before anything inside the
+        agent makes a TLS call.
+
+        Per PRD 0050 the per-provider steps (prompt, skills,
+        declarative provision-plan apply, supervise MCP registration)
+        live on the `AgentProvider` plugin. The backend only owns the
+        steps that are about backend infrastructure (CA, workspace,
+        git) and surfaces the supervise sidecar URL its launch step
+        knows about via `supervise_mcp_url`.
 
         PRD 0017: cred-proxy's agent-side dotfile rewrites (~/.npmrc,
         ~/.gitconfig insteadOf, tea config) are gone. Egress-proxy is
         on the agent's HTTP_PROXY path so every tool that respects
         HTTPS_PROXY (claude-code, git over HTTPS, npm, curl) is
         intercepted without per-tool reconfiguration."""
+        provider = get_provider(plan.agent_provision.template)
         self.provision_ca(plan, bottle)
-        prompt_path = self.provision_prompt(plan, bottle)
-        self.provision_provider_auth(plan, bottle)
-        self.provision_skills(plan, bottle)
+        prompt_path = provider.provision_prompt(plan, bottle)
+        provider.provision(plan, bottle)
+        provider.provision_skills(plan, bottle)
         self.provision_workspace(plan, bottle)
         self.provision_git(plan, bottle)
-        self.provision_supervise(plan, bottle)
+        provider.provision_supervise_mcp(
+            plan, bottle, self.supervise_mcp_url(plan),
+        )
         return prompt_path
 
     def provision_ca(self, plan: PlanT, bottle: "Bottle") -> None:
@@ -349,23 +359,6 @@ class BottleBackend(ABC, Generic[PlanT, CleanupT]):
         backend overrides to docker-cp the cert in and run
         `update-ca-certificates`."""
 
-    def provision_provider_auth(self, plan: PlanT, bottle: "Bottle") -> None:
-        """Install non-secret provider auth marker files into the agent
-        home when a provider needs them to select the right auth mode.
-        The default is no-op."""
-
-    @abstractmethod
-    def provision_prompt(self, plan: PlanT, bottle: "Bottle") -> str | None:
-        """Copy the prompt file into the running bottle. Returns the
-        in-container path iff the agent has a non-empty prompt;
-        callers use the return value to decide whether to add
-        provider-specific prompt args to the agent's argv."""
-
-    @abstractmethod
-    def provision_skills(self, plan: PlanT, bottle: "Bottle") -> None:
-        """Copy the agent's named skills from the host into the
-        running bottle. No-op when the agent has no skills."""
-
     def provision_workspace(self, plan: PlanT, bottle: "Bottle") -> None:
         """Copy the operator workspace into the running bottle when
         the backend cannot bake it into the agent image. Default is
@@ -376,12 +369,16 @@ class BottleBackend(ABC, Generic[PlanT, CleanupT]):
         """Copy the host's cwd `.git` directory into the running
         bottle if the user requested --cwd. No-op otherwise."""
 
-    def provision_supervise(self, plan: PlanT, bottle: "Bottle") -> None:
-        """Write the in-bottle Claude Code MCP config so the agent
-        discovers the per-bottle supervise sidecar (PRD 0013).
-        No-op when bottle.supervise is False or the backend doesn't
-        support the supervise sidecar yet. The Docker backend
-        overrides."""
+    def supervise_mcp_url(self, plan: PlanT) -> str:
+        """Return the agent-side URL of the per-bottle supervise
+        sidecar, or "" when this bottle has no sidecar. The provider
+        plugin's `provision_supervise_mcp` uses it to register the
+        MCP entry inside the guest.
+
+        Default returns "" so backends without supervise support
+        don't have to implement it. Docker and smolmachines override."""
+        del plan
+        return ""
 
     @abstractmethod
     def prepare_cleanup(self) -> CleanupT:
diff --git a/bot_bottle/backend/docker/backend.py b/bot_bottle/backend/docker/backend.py
index e502de2..539369b 100644
--- a/bot_bottle/backend/docker/backend.py
+++ b/bot_bottle/backend/docker/backend.py
@@ -9,6 +9,12 @@ This module is a thin façade. The real work lives in four siblings:
 
 The base class's `prepare` template runs cross-backend host-side
 validation before calling `_resolve_plan` here.
+
+Per PRD 0050 the per-provider provisioning steps (prompt, skills,
+the declarative provision-plan apply, supervise MCP registration)
+live on the `AgentProvider` plugin under `bot_bottle/contrib/`. The
+Docker backend only owns the steps that are about backend
+infrastructure: CA install and git copy-in.
 """
 
 from __future__ import annotations
@@ -18,6 +24,7 @@ from contextlib import contextmanager
 from pathlib import Path
 from typing import Generator, Sequence
 
+from ...supervise import SUPERVISE_HOSTNAME, SUPERVISE_PORT
 from .. import ActiveAgent, Bottle, BottleBackend, BottleSpec
 from . import cleanup as _cleanup
 from . import enumerate as _enumerate
@@ -28,10 +35,6 @@ from .bottle_cleanup_plan import DockerBottleCleanupPlan
 from .bottle_plan import DockerBottlePlan
 from .provision import ca as _ca
 from .provision import git as _git
-from .provision import prompt as _prompt
-from .provision import provider_auth as _provider_auth
-from .provision import skills as _skills
-from .provision import supervise as _supervise_prov
 
 
 class DockerBottleBackend(BottleBackend["DockerBottlePlan", "DockerBottleCleanupPlan"]):
@@ -60,20 +63,16 @@ class DockerBottleBackend(BottleBackend["DockerBottlePlan", "DockerBottleCleanup
     def provision_ca(self, plan: DockerBottlePlan, bottle: Bottle) -> None:
         _ca.provision_ca(plan, bottle)
 
-    def provision_prompt(self, plan: DockerBottlePlan, bottle: Bottle) -> str | None:
-        return _prompt.provision_prompt(plan, bottle)
-
-    def provision_provider_auth(self, plan: DockerBottlePlan, bottle: Bottle) -> None:
-        _provider_auth.provision_provider_auth(plan, bottle)
-
-    def provision_skills(self, plan: DockerBottlePlan, bottle: Bottle) -> None:
-        _skills.provision_skills(plan, bottle)
-
     def provision_git(self, plan: DockerBottlePlan, bottle: Bottle) -> None:
         _git.provision_git(plan, bottle)
 
-    def provision_supervise(self, plan: DockerBottlePlan, bottle: Bottle) -> None:
-        _supervise_prov.provision_supervise(plan, bottle)
+    def supervise_mcp_url(self, plan: DockerBottlePlan) -> str:
+        """Docker bottles reach the supervise sidecar via the
+        compose-network alias `supervise:9100`. No per-bottle URL
+        plumbing needed; the alias resolves inside the bridge."""
+        if plan.supervise_plan is None:
+            return ""
+        return f"http://{SUPERVISE_HOSTNAME}:{SUPERVISE_PORT}/"
 
     def prepare_cleanup(self) -> DockerBottleCleanupPlan:
         return _cleanup.prepare_cleanup()
diff --git a/bot_bottle/backend/docker/prepare.py b/bot_bottle/backend/docker/prepare.py
index da34d22..b9c5df5 100644
--- a/bot_bottle/backend/docker/prepare.py
+++ b/bot_bottle/backend/docker/prepare.py
@@ -63,7 +63,7 @@ def resolve_plan(
     bottle = manifest.bottle_for(spec.agent_name)
     provider = bottle.agent_provider
     provider_runtime = runtime_for(provider.template)
-    guest_home = os.environ.get("BOT_BOTTLE_CONTAINER_HOME", "/home/node")
+    guest_home = "/home/node"
     workspace_plan = resolve_workspace_plan(spec, guest_home=guest_home)
 
     # PRD 0016 follow-up: identity, not bare slug. A fresh `start`
@@ -233,6 +233,7 @@ def resolve_plan(
     return DockerBottlePlan(
         spec=spec,
         stage_dir=stage_dir,
+        guest_home=guest_home,
         slug=slug,
         container_name=container_name,
         container_name_pinned=container_name_pinned,
diff --git a/bot_bottle/backend/docker/provision/__init__.py b/bot_bottle/backend/docker/provision/__init__.py
index 2e87ef9..0c62fa1 100644
--- a/bot_bottle/backend/docker/provision/__init__.py
+++ b/bot_bottle/backend/docker/provision/__init__.py
@@ -1,8 +1,11 @@
-"""Per-provisioner modules for the Docker backend.
+"""Backend-infrastructure provisioners for the Docker backend.
 
-Each module exports one top-level function:
-    provision_<thing>(plan: DockerBottlePlan, bottle: Bottle) -> ...
+Per PRD 0050 the per-provider provisioning steps (prompt, skills,
+declarative provision-plan apply, supervise MCP registration) live on
+the `AgentProvider` plugin under `bot_bottle/contrib/`. The modules
+left in this subpackage handle only the steps that are
+backend-specific:
 
-`DockerBottleBackend.provision_*` methods delegate to these. The
-abstract `BottleBackend.provision_*` surface is unchanged; this
-subpackage exists only to keep `backend.py` from being a god-file."""
+  - ca.py   — install per-bottle CA bundle into the guest trust store
+  - git.py  — copy host cwd `.git` into the guest when --cwd is used
+"""
diff --git a/bot_bottle/backend/docker/provision/git.py b/bot_bottle/backend/docker/provision/git.py
index 34f9525..8d39ade 100644
--- a/bot_bottle/backend/docker/provision/git.py
+++ b/bot_bottle/backend/docker/provision/git.py
@@ -18,7 +18,6 @@ Three concerns, all about git in the agent:
 
 from __future__ import annotations
 
-import os
 import shlex
 
 from ....git_gate import GIT_GATE_HOSTNAME, git_gate_render_gitconfig
@@ -58,8 +57,7 @@ def _provision_git_gate_config(plan: DockerBottlePlan, bottle: Bottle) -> None:
     manifest_bottle = plan.spec.manifest.bottle_for(plan.spec.agent_name)
     if not manifest_bottle.git:
         return
-    container_home = os.environ.get("BOT_BOTTLE_CONTAINER_HOME", "/home/node")
-    container_gitconfig = f"{container_home}/.gitconfig"
+    container_gitconfig = f"{plan.guest_home}/.gitconfig"
 
     content = git_gate_render_gitconfig(manifest_bottle.git, GIT_GATE_HOSTNAME)
     config_file = plan.stage_dir / "agent_gitconfig"
diff --git a/bot_bottle/backend/docker/provision/prompt.py b/bot_bottle/backend/docker/provision/prompt.py
deleted file mode 100644
index c0395f4..0000000
--- a/bot_bottle/backend/docker/provision/prompt.py
+++ /dev/null
@@ -1,33 +0,0 @@
-"""Copy the agent prompt into a running Docker bottle.
-
-The prompt file is always copied (so the in-container path always
-exists) but `--append-system-prompt-file` only fires when the agent
-actually has a prompt — the return value signals which case."""
-
-from __future__ import annotations
-
-import os
-
-from ... import Bottle
-from ..bottle_plan import DockerBottlePlan
-
-
-def provision_prompt(plan: DockerBottlePlan, bottle: Bottle) -> str | None:
-    """Copy the prompt file into the container, fix ownership/mode.
-    Returns the in-container path if the agent has a non-empty
-    prompt (drives --append-system-prompt-file), else None. The
-    file is copied either way so the path always exists."""
-    container_home = os.environ.get("BOT_BOTTLE_CONTAINER_HOME", "/home/node")
-    in_container_prompt_path = f"{container_home}/.bot-bottle-prompt.txt"
-
-    bottle.cp_in(str(plan.prompt_file), in_container_prompt_path)
-    # `docker cp` preserves host UID; re-own/mode as root so node
-    # can read its own mode-600 prompt regardless of host UID.
-    bottle.exec(
-        f"chown node:node {in_container_prompt_path} && "
-        f"chmod 600 {in_container_prompt_path}",
-        user="root",
-    )
-
-    agent = plan.spec.manifest.agents[plan.spec.agent_name]
-    return in_container_prompt_path if agent.prompt else None
diff --git a/bot_bottle/backend/docker/provision/provider_auth.py b/bot_bottle/backend/docker/provision/provider_auth.py
deleted file mode 100644
index 0068e36..0000000
--- a/bot_bottle/backend/docker/provision/provider_auth.py
+++ /dev/null
@@ -1,35 +0,0 @@
-"""Provision non-secret provider auth markers into a Docker bottle."""
-
-from __future__ import annotations
-
-import shlex
-
-from ....log import die
-from ... import Bottle
-from ..bottle_plan import DockerBottlePlan
-
-
-def provision_provider_auth(plan: DockerBottlePlan, bottle: Bottle) -> None:
-    """Apply provider-owned guest setup through the bottle's exec / cp_in."""
-    provision = plan.agent_provision
-    for d in provision.dirs:
-        _exec(bottle, f"mkdir -p {shlex.quote(d.guest_path)}", d.guest_path)
-        _exec(bottle, f"chown {shlex.quote(d.owner)} {shlex.quote(d.guest_path)}", d.guest_path)
-        _exec(bottle, f"chmod {shlex.quote(d.mode)} {shlex.quote(d.guest_path)}", d.guest_path)
-    for command in provision.pre_copy:
-        _exec(bottle, shlex.join(command.argv), command.error)
-    for f in provision.files:
-        bottle.cp_in(str(f.host_path), f.guest_path)
-        _exec(bottle, f"chown {shlex.quote(f.owner)} {shlex.quote(f.guest_path)}", f.guest_path)
-        _exec(bottle, f"chmod {shlex.quote(f.mode)} {shlex.quote(f.guest_path)}", f.guest_path)
-    for command in provision.verify:
-        _exec(bottle, shlex.join(command.argv), command.error)
-
-
-def _exec(bottle: Bottle, script: str, error: str) -> None:
-    result = bottle.exec(script, user="root")
-    if result.returncode != 0:
-        detail = (result.stderr or result.stdout).strip()
-        if detail:
-            detail = f": {detail}"
-        die(f"agent provider provisioning: {error}{detail}")
diff --git a/bot_bottle/backend/docker/provision/skills.py b/bot_bottle/backend/docker/provision/skills.py
deleted file mode 100644
index 82f09e5..0000000
--- a/bot_bottle/backend/docker/provision/skills.py
+++ /dev/null
@@ -1,44 +0,0 @@
-"""Copy host-side skill directories into a running Docker bottle.
-
-Skills are validated on the host before launch by the base class's
-`BottleBackend._validate_skills` (called from `prepare`); this module
-assumes that validation has already run. A skill disappearing between
-validation and copy still dies loudly rather than silently producing
-a partial container."""
-
-from __future__ import annotations
-
-import os
-
-from ....log import die, info
-from ...util import host_skill_dir
-from ... import Bottle
-from ..bottle_plan import DockerBottlePlan
-
-
-def provision_skills(plan: DockerBottlePlan, bottle: Bottle) -> None:
-    """Copy each of the agent's named skills from the host's
-    ~/.claude/skills/<name>/ into the container's equivalent path.
-    For each skill: ensure parent dir, wipe any prior copy, then
-    `cp_in <host>/. <container>:<dst>/` so the contents are
-    copied into a freshly-created destination dir. No-op when the
-    agent has no skills."""
-    agent = plan.spec.manifest.agents[plan.spec.agent_name]
-    if not agent.skills:
-        return
-
-    container_home = os.environ.get("BOT_BOTTLE_CONTAINER_HOME", "/home/node")
-    skills_dir = os.environ.get(
-        "BOT_BOTTLE_CONTAINER_SKILLS_DIR", f"{container_home}/.claude/skills"
-    )
-
-    bottle.exec(f"mkdir -p {skills_dir}", user="node")
-
-    for n in agent.skills:
-        src = host_skill_dir(n)
-        if not os.path.isdir(src):
-            die(f"skill '{n}' disappeared from host between validation and copy at {src}.")
-        dst = f"{skills_dir}/{n}"
-        info(f"copying skill {n} into {bottle.name}:{dst}")
-        bottle.exec(f"rm -rf {dst} && mkdir -p {dst}", user="node")
-        bottle.cp_in(f"{src}/.", f"{dst}/")
diff --git a/bot_bottle/backend/docker/provision/supervise.py b/bot_bottle/backend/docker/provision/supervise.py
deleted file mode 100644
index 71b48cd..0000000
--- a/bot_bottle/backend/docker/provision/supervise.py
+++ /dev/null
@@ -1,59 +0,0 @@
-"""Supervise sidecar provisioning inside a running Docker bottle
-(PRD 0013).
-
-Registers the per-bottle supervise sidecar as an HTTP MCP server in
-the agent's claude-code config so the agent discovers the three
-stuck-recovery MCP tools (cred-proxy-block, pipelock-block,
-capability-block) at startup.
-
-Uses `claude mcp add` rather than writing JSON directly. claude-code
-owns the on-disk config format (`~/.claude.json` `mcpServers` shape,
-field names, scope semantics) and changes it between versions; the
-official command handles whatever the installed version expects.
-
-No-op when bottle.supervise is False — bottles that haven't opted
-into the supervise sidecar shouldn't get an MCP entry pointing at a
-sidecar that isn't running.
-"""
-
-from __future__ import annotations
-
-from ....log import info, warn
-from ....supervise import SUPERVISE_HOSTNAME, SUPERVISE_PORT
-from ... import Bottle
-from ..bottle_plan import DockerBottlePlan
-
-
-_SUPERVISE_MCP_NAME = "supervise"
-
-
-def supervise_mcp_url() -> str:
-    return f"http://{SUPERVISE_HOSTNAME}:{SUPERVISE_PORT}/"
-
-
-def provision_supervise(plan: DockerBottlePlan, bottle: Bottle) -> None:
-    """Run `claude mcp add` inside the agent container to register
-    the supervise sidecar in claude-code's user config. No-op when
-    bottle.supervise is False.
-
-    Failure is logged but not fatal: the bottle still works (you
-    just can't call supervise tools from the agent until the entry
-    is added manually). The operator sees the warning at launch."""
-    if plan.supervise_plan is None:
-        return
-    url = supervise_mcp_url()
-    info(f"registering supervise MCP server in agent claude config → {url}")
-    r = bottle.exec(
-        f"claude mcp add --scope user --transport http {_SUPERVISE_MCP_NAME} {url}",
-        user="node",
-    )
-    if r.returncode != 0:
-        warn(
-            f"`claude mcp add supervise` failed (exit {r.returncode}): "
-            f"{(r.stderr or r.stdout or '').strip()}. Inside the bottle, "
-            f"register manually with: "
-            f"claude mcp add --scope user --transport http supervise {url}"
-        )
-
-
-__all__ = ["provision_supervise", "supervise_mcp_url"]
diff --git a/bot_bottle/backend/smolmachines/backend.py b/bot_bottle/backend/smolmachines/backend.py
index bdf1270..e29f1c3 100644
--- a/bot_bottle/backend/smolmachines/backend.py
+++ b/bot_bottle/backend/smolmachines/backend.py
@@ -1,5 +1,11 @@
 """SmolmachinesBottleBackend — the smolmachines implementation of
-BottleBackend (PRD 0023)."""
+BottleBackend (PRD 0023).
+
+Per PRD 0050 the per-provider provisioning steps (prompt, skills,
+the declarative provision-plan apply, supervise MCP registration)
+live on the `AgentProvider` plugin under `bot_bottle/contrib/`. The
+smolmachines backend only owns the steps that are about backend
+infrastructure: CA install (no-op for now), workspace, git copy-in."""
 
 from __future__ import annotations
 
@@ -18,10 +24,6 @@ from .bottle_cleanup_plan import SmolmachinesBottleCleanupPlan
 from .bottle_plan import SmolmachinesBottlePlan
 from .provision import ca as _ca
 from .provision import git as _git
-from .provision import prompt as _prompt
-from .provision import provider_auth as _provider_auth
-from .provision import skills as _skills
-from .provision import supervise as _supervise
 from .provision import workspace as _workspace
 
 
@@ -58,21 +60,6 @@ class SmolmachinesBottleBackend(
     ) -> None:
         _ca.provision_ca(plan, bottle)
 
-    def provision_prompt(
-        self, plan: SmolmachinesBottlePlan, bottle: Bottle
-    ) -> str | None:
-        return _prompt.provision_prompt(plan, bottle)
-
-    def provision_provider_auth(
-        self, plan: SmolmachinesBottlePlan, bottle: Bottle
-    ) -> None:
-        _provider_auth.provision_provider_auth(plan, bottle)
-
-    def provision_skills(
-        self, plan: SmolmachinesBottlePlan, bottle: Bottle
-    ) -> None:
-        _skills.provision_skills(plan, bottle)
-
     def provision_workspace(
         self, plan: SmolmachinesBottlePlan, bottle: Bottle
     ) -> None:
@@ -83,10 +70,12 @@ class SmolmachinesBottleBackend(
     ) -> None:
         _git.provision_git(plan, bottle)
 
-    def provision_supervise(
-        self, plan: SmolmachinesBottlePlan, bottle: Bottle
-    ) -> None:
-        _supervise.provision_supervise(plan, bottle)
+    def supervise_mcp_url(self, plan: SmolmachinesBottlePlan) -> str:
+        """The smolmachines guest reaches the supervise sidecar via a
+        host-published random port the launch step pinned earlier
+        (`http://<loopback_ip>:<random_port>/`). `agent_supervise_url`
+        on the plan is "" when the bottle has no sidecar."""
+        return plan.agent_supervise_url
 
     def prepare_cleanup(self) -> SmolmachinesBottleCleanupPlan:
         return _cleanup.prepare_cleanup()
diff --git a/bot_bottle/backend/smolmachines/prepare.py b/bot_bottle/backend/smolmachines/prepare.py
index 53a6c42..b4c7690 100644
--- a/bot_bottle/backend/smolmachines/prepare.py
+++ b/bot_bottle/backend/smolmachines/prepare.py
@@ -61,7 +61,7 @@ def resolve_plan(
     bottle = manifest.bottle_for(spec.agent_name)
     provider = bottle.agent_provider
     provider_runtime = runtime_for(provider.template)
-    guest_home = os.environ.get("BOT_BOTTLE_GUEST_HOME", "/home/node")
+    guest_home = "/home/node"
     workspace_plan = resolve_workspace_plan(spec, guest_home=guest_home)
 
     slug = spec.identity or bottle_identity(spec.agent_name)
@@ -172,6 +172,7 @@ def resolve_plan(
     return SmolmachinesBottlePlan(
         spec=spec,
         stage_dir=stage_dir,
+        guest_home=guest_home,
         slug=slug,
         bundle_subnet=subnet,
         bundle_gateway=gateway,
diff --git a/bot_bottle/backend/smolmachines/provision/__init__.py b/bot_bottle/backend/smolmachines/provision/__init__.py
index cc202c0..97d5288 100644
--- a/bot_bottle/backend/smolmachines/provision/__init__.py
+++ b/bot_bottle/backend/smolmachines/provision/__init__.py
@@ -1,14 +1,12 @@
-"""Provisioning helpers for the smolmachines backend (PRD 0023
-chunk 4).
+"""Backend-infrastructure provisioners for the smolmachines backend.
 
-Each method maps onto one of `BottleBackend`'s `provision_*`
-overrides. They run after the VM is up + the bundle is reachable
-and copy host-side state (prompt, skills, .git, CA cert,
-supervise MCP config) into the guest via `smolvm machine cp` /
-`smolvm machine exec`.
+Per PRD 0050 the per-provider provisioning steps (prompt, skills,
+declarative provision-plan apply, supervise MCP registration) live on
+the `AgentProvider` plugin under `bot_bottle/contrib/`. The modules
+left in this subpackage handle only the steps that are
+backend-specific:
 
-Chunk 4a ships `provision_prompt` and `provision_skills` — the
-two that don't depend on agent-image tooling (claude-code,
-update-ca-certificates) beyond `cp` and `mkdir`. provision_ca /
-provision_git / provision_supervise land once the agent-image
-gap is solved."""
+  - ca.py        — install per-bottle CA bundle into the guest trust store
+  - git.py       — copy host cwd `.git` into the guest when --cwd is used
+  - workspace.py — copy the operator workspace into the guest
+"""
diff --git a/bot_bottle/backend/smolmachines/provision/git.py b/bot_bottle/backend/smolmachines/provision/git.py
index 90151a3..0f5ebb8 100644
--- a/bot_bottle/backend/smolmachines/provision/git.py
+++ b/bot_bottle/backend/smolmachines/provision/git.py
@@ -36,17 +36,6 @@ from ... import Bottle
 from ..bottle_plan import SmolmachinesBottlePlan
 
 
-# `node` is the agent user from the repo Dockerfile. Override via
-# BOT_BOTTLE_GUEST_HOME mirrors the docker backend's
-# BOT_BOTTLE_CONTAINER_HOME knob — same purpose, different
-# transport.
-_DEFAULT_GUEST_HOME = "/home/node"
-
-
-def _guest_home() -> str:
-    return os.environ.get("BOT_BOTTLE_GUEST_HOME", _DEFAULT_GUEST_HOME)
-
-
 def provision_git(plan: SmolmachinesBottlePlan, bottle: Bottle) -> None:
     """Set up git inside the guest. Runs all three subcases; each
     no-ops when its condition isn't met."""
@@ -95,7 +84,7 @@ def _provision_git_gate_config(
         manifest_bottle.git, plan.agent_git_gate_host, scheme="http",
     )
 
-    guest_gitconfig = f"{_guest_home()}/.gitconfig"
+    guest_gitconfig = f"{plan.guest_home}/.gitconfig"
     # Stage the file under the plan's stage_dir so cp_in
     # has a stable host path. The plan's stage_dir is cleaned up
     # by start.py's session-end teardown.
diff --git a/bot_bottle/backend/smolmachines/provision/prompt.py b/bot_bottle/backend/smolmachines/provision/prompt.py
deleted file mode 100644
index 7ab24f3..0000000
--- a/bot_bottle/backend/smolmachines/provision/prompt.py
+++ /dev/null
@@ -1,44 +0,0 @@
-"""Copy the agent prompt into a running smolmachines bottle.
-
-The prompt file is always copied (so the in-guest path always
-exists) but `--append-system-prompt-file` only fires when the
-agent actually has a prompt — the return value signals which
-case, mirroring the docker backend's contract.
-
-cp_in lands files as root inside the VM; the claude
-process runs as `node`, so we chown + chmod the prompt after the
-copy. Same flow as the docker backend's provision_prompt."""
-
-from __future__ import annotations
-
-import os
-
-from ... import Bottle
-from ..bottle_plan import SmolmachinesBottlePlan
-
-
-# `node` is the agent user from the repo Dockerfile.
-# BOT_BOTTLE_GUEST_HOME mirrors the docker backend's
-# BOT_BOTTLE_CONTAINER_HOME knob.
-_DEFAULT_GUEST_HOME = "/home/node"
-
-
-def provision_prompt(plan: SmolmachinesBottlePlan, bottle: Bottle) -> str | None:
-    """Copy the prompt file into the running smolvm guest, fix
-    ownership/mode. Returns the in-guest path if the agent has a
-    non-empty prompt (drives --append-system-prompt-file), else
-    None. The file is copied either way so the path always
-    exists — mirrors the docker backend's behavior."""
-    guest_home = os.environ.get("BOT_BOTTLE_GUEST_HOME", _DEFAULT_GUEST_HOME)
-    in_guest_prompt_path = f"{guest_home}/.bot-bottle-prompt.txt"
-
-    bottle.cp_in(str(plan.prompt_file), in_guest_prompt_path)
-    # cp_in lands as root, source's 0o600 mode is preserved —
-    # node can't read its own prompt without these two.
-    bottle.exec(
-        f"chown node:node {in_guest_prompt_path} && chmod 600 {in_guest_prompt_path}",
-        user="root",
-    )
-
-    agent = plan.spec.manifest.agents[plan.spec.agent_name]
-    return in_guest_prompt_path if agent.prompt else None
diff --git a/bot_bottle/backend/smolmachines/provision/provider_auth.py b/bot_bottle/backend/smolmachines/provision/provider_auth.py
deleted file mode 100644
index 426bed4..0000000
--- a/bot_bottle/backend/smolmachines/provision/provider_auth.py
+++ /dev/null
@@ -1,35 +0,0 @@
-"""Provision non-secret provider auth markers into a smolmachines bottle."""
-
-from __future__ import annotations
-
-import shlex
-
-from ....log import die
-from ... import Bottle
-from ..bottle_plan import SmolmachinesBottlePlan
-
-
-def provision_provider_auth(plan: SmolmachinesBottlePlan, bottle: Bottle) -> None:
-    """Apply provider-owned guest setup through the bottle's exec / cp_in."""
-    provision = plan.agent_provision
-    for d in provision.dirs:
-        _exec(bottle, f"mkdir -p {shlex.quote(d.guest_path)}", f"could not create {d.guest_path}")
-        _exec(bottle, f"chown {shlex.quote(d.owner)} {shlex.quote(d.guest_path)}", f"could not chown {d.guest_path}")
-        _exec(bottle, f"chmod {shlex.quote(d.mode)} {shlex.quote(d.guest_path)}", f"could not chmod {d.guest_path}")
-    for command in provision.pre_copy:
-        _exec(bottle, shlex.join(command.argv), command.error)
-    for f in provision.files:
-        bottle.cp_in(str(f.host_path), f.guest_path)
-        _exec(bottle, f"chown {shlex.quote(f.owner)} {shlex.quote(f.guest_path)}", f"could not chown {f.guest_path}")
-        _exec(bottle, f"chmod {shlex.quote(f.mode)} {shlex.quote(f.guest_path)}", f"could not chmod {f.guest_path}")
-    for command in provision.verify:
-        _exec(bottle, shlex.join(command.argv), command.error)
-
-
-def _exec(bottle: Bottle, script: str, error: str) -> None:
-    result = bottle.exec(script, user="root")
-    if result.returncode != 0:
-        detail = (result.stderr or result.stdout).strip()
-        if detail:
-            detail = f": {detail}"
-        die(f"agent provider provisioning: {error}{detail}")
diff --git a/bot_bottle/backend/smolmachines/provision/skills.py b/bot_bottle/backend/smolmachines/provision/skills.py
deleted file mode 100644
index 7f21625..0000000
--- a/bot_bottle/backend/smolmachines/provision/skills.py
+++ /dev/null
@@ -1,63 +0,0 @@
-"""Copy host-side skill directories into a running smolmachines
-bottle.
-
-Skills are validated on the host before launch by
-`BottleBackend._validate_skills`; this module assumes that
-validation has already run. A skill that disappears between
-validation and copy still dies loudly rather than silently
-producing a partial guest."""
-
-from __future__ import annotations
-
-import os
-
-from ....log import die, info
-from ...util import host_skill_dir
-from ... import Bottle
-from ..bottle_plan import SmolmachinesBottlePlan
-
-
-# In-guest path mirrors the docker backend's claude-skills
-# convention (~/.claude/skills/<name>/) under the node user's
-# home — same path as the real bot-bottle image's
-# /home/node/.claude/skills (pre-created in the Dockerfile).
-_DEFAULT_SKILLS_DIR = "/home/node/.claude/skills"
-
-
-def provision_skills(plan: SmolmachinesBottlePlan, bottle: Bottle) -> None:
-    """Copy each of the agent's named skills from the host's
-    ~/.claude/skills/<name>/ into the guest's equivalent path.
-    For each skill: `mkdir -p` the destination, cp_in the host
-    source dir over, then chown the result to node:node so the
-    agent can read it. No-op when the agent has no skills.
-
-    cp_in on a directory copies recursively; unlike docker cp's
-    trailing-slash convention, smolvm doesn't need the `/.` suffix
-    dance.
-
-    cp_in lands files as root inside the VM, so we chown each
-    skill tree over to node:node after the copy — same pattern as
-    the docker backend's provision_prompt."""
-    agent = plan.spec.manifest.agents[plan.spec.agent_name]
-    if not agent.skills:
-        return
-
-    skills_dir = os.environ.get(
-        "BOT_BOTTLE_GUEST_SKILLS_DIR", _DEFAULT_SKILLS_DIR,
-    )
-
-    bottle.exec(f"mkdir -p {skills_dir}", user="root")
-
-    for name in agent.skills:
-        src = host_skill_dir(name)
-        if not os.path.isdir(src):
-            die(
-                f"skill {name!r} disappeared from host between "
-                f"validation and copy at {src}."
-            )
-        dst = f"{skills_dir}/{name}"
-        info(f"copying skill {name} into {bottle.name}:{dst}")
-        # Wipe any prior copy so re-runs don't accumulate.
-        bottle.exec(f"rm -rf {dst}", user="root")
-        bottle.cp_in(src, dst)
-        bottle.exec(f"chown -R node:node {dst}", user="root")
diff --git a/bot_bottle/backend/smolmachines/provision/supervise.py b/bot_bottle/backend/smolmachines/provision/supervise.py
deleted file mode 100644
index 58929a3..0000000
--- a/bot_bottle/backend/smolmachines/provision/supervise.py
+++ /dev/null
@@ -1,58 +0,0 @@
-"""Supervise sidecar provisioning inside a running smolmachines
-bottle (PRD 0023 chunk 4d; PRD 0013 supervise plane).
-
-Registers the per-bottle supervise sidecar as an HTTP MCP server
-in the agent's claude-code config so the agent discovers the
-stuck-recovery MCP tools (pipelock-block, capability-block) at
-startup.
-
-Mirrors `backend.docker.provision.supervise` — same `claude mcp
-add` call, just dispatched via bottle.exec instead of
-`docker exec`, and against `<bundle_ip>:<port>` instead of the
-short `supervise` alias (no DNS in the TSI-allowlisted guest)."""
-
-from __future__ import annotations
-
-from ....log import info, warn
-from ... import Bottle
-from ..bottle_plan import SmolmachinesBottlePlan
-
-
-_SUPERVISE_MCP_NAME = "supervise"
-
-
-def provision_supervise(plan: SmolmachinesBottlePlan, bottle: Bottle) -> None:
-    """Run `claude mcp add` inside the guest to register the
-    supervise sidecar in claude-code's user config. No-op when
-    bottle.supervise is False.
-
-    The URL is the agent-side endpoint launch.py populated after
-    bundle bringup — `http://127.0.0.1:<host port>/` rather than
-    the bundle's docker bridge IP, because that bridge isn't
-    reachable from the smolvm guest on macOS.
-
-    Failure is logged but not fatal: the bottle still works (you
-    just can't call supervise tools from the agent until the entry
-    is added manually). The operator sees the warning at launch."""
-    if plan.supervise_plan is None:
-        return
-    url = plan.agent_supervise_url
-    info(f"registering supervise MCP server in agent claude config → {url}")
-    # `claude mcp add --scope user` writes to ~/.claude.json. Run
-    # as node so the config lands in /home/node/.claude.json.
-    # SmolmachinesBottle.exec sets HOME and USER automatically
-    # for the requested user.
-    r = bottle.exec(
-        f"claude mcp add --scope user --transport http {_SUPERVISE_MCP_NAME} {url}",
-        user="node",
-    )
-    if r.returncode != 0:
-        warn(
-            f"`claude mcp add supervise` failed (exit {r.returncode}): "
-            f"{(r.stderr or r.stdout or '').strip()}. Inside the bottle, "
-            f"register manually with: "
-            f"claude mcp add --scope user --transport http supervise {url}"
-        )
-
-
-__all__ = ["provision_supervise"]
diff --git a/bot_bottle/contrib/claude/__init__.py b/bot_bottle/contrib/claude/__init__.py
new file mode 100644
index 0000000..e69de29
diff --git a/bot_bottle/contrib/claude/agent_provider.py b/bot_bottle/contrib/claude/agent_provider.py
new file mode 100644
index 0000000..cd8ff14
--- /dev/null
+++ b/bot_bottle/contrib/claude/agent_provider.py
@@ -0,0 +1,226 @@
+"""Claude agent provider plugin (PRD 0050, contrib).
+
+The Claude-specific behavior previously inlined under
+`agent_provider.agent_provision_plan` (claude.json trust marker,
+api.anthropic.com egress route, OAuth-token placeholder), plus
+the `claude mcp add` invocation that registers the supervise
+sidecar in claude-code's user config (PRD 0013)."""
+
+from __future__ import annotations
+
+import json
+import os
+import shlex
+from pathlib import Path
+from typing import TYPE_CHECKING
+
+from ...agent_provider import (
+    AgentProvider,
+    AgentProviderRuntime,
+    AgentProvisionFile,
+    AgentProvisionPlan,
+)
+from ...egress import EgressRoute
+from ...log import die, info, warn
+
+
+if TYPE_CHECKING:
+    from ...backend import Bottle, BottlePlan
+
+
+_REPO_ROOT = Path(__file__).resolve().parents[3]
+
+_SUPERVISE_MCP_NAME = "supervise"
+
+
+def _skills_dir(guest_home: str) -> str:
+    return f"{guest_home}/.claude/skills"
+
+
+def _prompt_path(guest_home: str) -> str:
+    return f"{guest_home}/.bot-bottle-prompt.txt"
+
+_RUNTIME = AgentProviderRuntime(
+    template="claude",
+    command="claude",
+    image="bot-bottle-claude:latest",
+    dockerfile=str(_REPO_ROOT / "Dockerfile.claude"),
+    prompt_mode="append_file",
+    bypass_args=("--dangerously-skip-permissions",),
+    resume_args=("--continue",),
+    remote_control_args=("--remote-control",),
+)
+
+
+class ClaudeAgentProvider(AgentProvider):
+    @property
+    def runtime(self) -> AgentProviderRuntime:
+        return _RUNTIME
+
+    def provision_plan(
+        self,
+        *,
+        dockerfile: str,
+        state_dir: Path,
+        guest_home: str,
+        guest_env: dict[str, str] | None = None,
+        auth_token: str = "",
+        forward_host_credentials: bool = False,
+        host_env: dict[str, str] | None = None,
+        trusted_project_path: str = "",
+    ) -> AgentProvisionPlan:
+        del forward_host_credentials, host_env  # Codex-only knobs
+        resolved_guest_env = dict(guest_env or {})
+        trusted_path = trusted_project_path or guest_home
+
+        env_vars: dict[str, str] = {
+            "CLAUDE_CODE_DISABLE_NONESSENTIAL_TRAFFIC": "1",
+            "DISABLE_ERROR_REPORTING": "1",
+        }
+        claude_config = state_dir / "claude.json"
+        claude_projects = {guest_home: {"hasTrustDialogAccepted": True}}
+        claude_projects[trusted_path] = {"hasTrustDialogAccepted": True}
+        claude_config.write_text(json.dumps({
+            "hasCompletedOnboarding": True,
+            "theme": "dark",
+            "bypassPermissionsModeAccepted": True,
+            "projects": claude_projects,
+        }, indent=2) + "\n")
+        claude_config.chmod(0o600)
+        files = (
+            AgentProvisionFile(claude_config, f"{guest_home}/.claude.json"),
+        )
+        egress_routes = (EgressRoute(
+            host="api.anthropic.com",
+            auth_scheme="Bearer" if auth_token else "",
+            token_ref=auth_token,
+            tls_passthrough=True,
+        ),)
+        hidden_env_names: frozenset[str] = frozenset()
+        if auth_token:
+            env_vars["CLAUDE_CODE_OAUTH_TOKEN"] = "egress-placeholder"
+            hidden_env_names = frozenset({"CLAUDE_CODE_OAUTH_TOKEN"})
+
+        return AgentProvisionPlan(
+            template=_RUNTIME.template,
+            command=_RUNTIME.command,
+            prompt_mode=_RUNTIME.prompt_mode,
+            image=_RUNTIME.image,
+            dockerfile=dockerfile,
+            env_vars=env_vars,
+            guest_env=resolved_guest_env,
+            files=files,
+            egress_routes=egress_routes,
+            hidden_env_names=hidden_env_names,
+        )
+
+    def provision_skills(self, plan: "BottlePlan", bottle: "Bottle") -> None:
+        """Copy each named skill tree from `~/.claude/skills/<name>/`
+        on the host into the guest's claude-code skills dir. No-op
+        when the agent has no skills."""
+        from ...backend.util import host_skill_dir
+
+        agent = plan.spec.manifest.agents[plan.spec.agent_name]
+        if not agent.skills:
+            return
+        skills_dir = _skills_dir(plan.guest_home)
+        bottle.exec(f"mkdir -p {skills_dir}", user="root")
+        for name in agent.skills:
+            src = host_skill_dir(name)
+            if not os.path.isdir(src):
+                die(
+                    f"skill {name!r} disappeared from host between "
+                    f"validation and copy at {src}."
+                )
+            dst = f"{skills_dir}/{name}"
+            info(f"copying skill {name} into {bottle.name}:{dst}")
+            bottle.exec(f"rm -rf {dst} && mkdir -p {dst}", user="root")
+            bottle.cp_in(f"{src}/.", f"{dst}/")
+            bottle.exec(f"chown -R node:node {dst}", user="root")
+
+    def provision_prompt(self, plan: "BottlePlan", bottle: "Bottle") -> str | None:
+        """Copy the prompt file into the guest, fix ownership/mode.
+        Returns the in-guest path iff the agent has a non-empty
+        prompt (drives `--append-system-prompt-file`); the file is
+        copied either way so the path always exists."""
+        prompt_path = _prompt_path(plan.guest_home)
+        bottle.cp_in(str(plan.prompt_file), prompt_path)
+        bottle.exec(
+            f"chown node:node {prompt_path} && chmod 600 {prompt_path}",
+            user="root",
+        )
+        agent = plan.spec.manifest.agents[plan.spec.agent_name]
+        return prompt_path if agent.prompt else None
+
+    def provision(self, plan: "BottlePlan", bottle: "Bottle") -> None:
+        """Apply the claude-side declarative provision steps from
+        `plan.agent_provision` — today that's the `claude.json`
+        trust-marker file. Hot-replace this with a richer flow as
+        claude-code's harness shape evolves."""
+        provision = plan.agent_provision
+        for d in provision.dirs:
+            path = shlex.quote(d.guest_path)
+            _exec(bottle, f"mkdir -p {path}", f"could not create {d.guest_path}")
+            _exec(
+                bottle,
+                f"chown {shlex.quote(d.owner)} {path}",
+                f"could not chown {d.guest_path}",
+            )
+            _exec(
+                bottle,
+                f"chmod {shlex.quote(d.mode)} {path}",
+                f"could not chmod {d.guest_path}",
+            )
+        for command in provision.pre_copy:
+            _exec(bottle, shlex.join(command.argv), command.error)
+        for f in provision.files:
+            bottle.cp_in(str(f.host_path), f.guest_path)
+            path = shlex.quote(f.guest_path)
+            _exec(
+                bottle,
+                f"chown {shlex.quote(f.owner)} {path}",
+                f"could not chown {f.guest_path}",
+            )
+            _exec(
+                bottle,
+                f"chmod {shlex.quote(f.mode)} {path}",
+                f"could not chmod {f.guest_path}",
+            )
+        for command in provision.verify:
+            _exec(bottle, shlex.join(command.argv), command.error)
+
+    def provision_supervise_mcp(
+        self,
+        plan: "BottlePlan",
+        bottle: "Bottle",
+        supervise_url: str,
+    ) -> None:
+        """Run `claude mcp add` inside the agent guest to register the
+        supervise sidecar in claude-code's user config (~/.claude.json).
+
+        Failure is logged but not fatal — the bottle still works without
+        the entry; the operator can register it manually."""
+        if plan.supervise_plan is None:
+            return
+        info(f"registering supervise MCP server in agent claude config → {supervise_url}")
+        r = bottle.exec(
+            f"claude mcp add --scope user --transport http "
+            f"{_SUPERVISE_MCP_NAME} {supervise_url}",
+            user="node",
+        )
+        if r.returncode != 0:
+            warn(
+                f"`claude mcp add supervise` failed (exit {r.returncode}): "
+                f"{(r.stderr or r.stdout or '').strip()}. Inside the bottle, "
+                f"register manually with: "
+                f"claude mcp add --scope user --transport http supervise {supervise_url}"
+            )
+
+
+def _exec(bottle: "Bottle", script: str, error: str) -> None:
+    result = bottle.exec(script, user="root")
+    if result.returncode != 0:
+        detail = (result.stderr or result.stdout).strip()
+        if detail:
+            detail = f": {detail}"
+        die(f"agent provider provisioning: {error}{detail}")
diff --git a/bot_bottle/contrib/codex/__init__.py b/bot_bottle/contrib/codex/__init__.py
new file mode 100644
index 0000000..e69de29
diff --git a/bot_bottle/contrib/codex/agent_provider.py b/bot_bottle/contrib/codex/agent_provider.py
new file mode 100644
index 0000000..9fb92f8
--- /dev/null
+++ b/bot_bottle/contrib/codex/agent_provider.py
@@ -0,0 +1,271 @@
+"""Codex agent provider plugin (PRD 0050, contrib).
+
+The Codex-specific behavior previously inlined under
+`agent_provider.agent_provision_plan` (config.toml trust marker,
+chatgpt.com / api.openai.com egress routes, optional host-credential
+forwarding with dummy-auth.json + verify), plus the `codex mcp add`
+invocation that registers the supervise sidecar in Codex's
+~/.codex/config.toml (PRD 0050)."""
+
+from __future__ import annotations
+
+import os
+import shlex
+from pathlib import Path
+from typing import TYPE_CHECKING
+
+from ...agent_provider import (
+    CODEX_HOST_CREDENTIAL_HOSTS,
+    AgentProvider,
+    AgentProviderRuntime,
+    AgentProvisionCommand,
+    AgentProvisionDir,
+    AgentProvisionFile,
+    AgentProvisionPlan,
+)
+from ...codex_auth import codex_host_access_token, write_codex_dummy_auth_file
+from ...egress import CODEX_HOST_CREDENTIAL_TOKEN_REF, EgressRoute
+from ...log import die, info, warn
+
+
+if TYPE_CHECKING:
+    from ...backend import Bottle, BottlePlan
+
+
+_REPO_ROOT = Path(__file__).resolve().parents[3]
+
+_SUPERVISE_MCP_NAME = "supervise"
+
+
+def _skills_dir(guest_home: str) -> str:
+    # Codex agents still read skills from the claude-code convention
+    # (~/.claude/skills/) — the bot-bottle-codex image follows the
+    # same layout. If Codex grows native skill discovery later,
+    # change here.
+    return f"{guest_home}/.claude/skills"
+
+
+def _prompt_path(guest_home: str) -> str:
+    return f"{guest_home}/.bot-bottle-prompt.txt"
+
+_RUNTIME = AgentProviderRuntime(
+    template="codex",
+    command="codex",
+    image="bot-bottle-codex:latest",
+    dockerfile=str(_REPO_ROOT / "Dockerfile.codex"),
+    prompt_mode="read_prompt_file",
+    bypass_args=("--dangerously-bypass-approvals-and-sandbox",),
+    resume_args=("resume", "--last"),
+    remote_control_args=(),
+)
+
+
+class CodexAgentProvider(AgentProvider):
+    @property
+    def runtime(self) -> AgentProviderRuntime:
+        return _RUNTIME
+
+    def provision_plan(
+        self,
+        *,
+        dockerfile: str,
+        state_dir: Path,
+        guest_home: str,
+        guest_env: dict[str, str] | None = None,
+        auth_token: str = "",
+        forward_host_credentials: bool = False,
+        host_env: dict[str, str] | None = None,
+        trusted_project_path: str = "",
+    ) -> AgentProvisionPlan:
+        del auth_token  # Claude-only knob
+        resolved_guest_env = dict(guest_env or {})
+        trusted_path = trusted_project_path or guest_home
+
+        env_vars: dict[str, str] = {
+            "CODEX_CA_CERTIFICATE": "/etc/ssl/certs/ca-certificates.crt",
+        }
+        auth_dir = resolved_guest_env.get("CODEX_HOME", f"{guest_home}/.codex")
+        if forward_host_credentials:
+            env_vars["CODEX_HOME"] = auth_dir
+
+        dirs = [AgentProvisionDir(auth_dir)]
+        files: list[AgentProvisionFile] = []
+        pre_copy: list[AgentProvisionCommand] = []
+        verify: list[AgentProvisionCommand] = []
+        provisioned_env: dict[str, str] = {}
+
+        config_path = f"{auth_dir}/config.toml"
+        config_file = state_dir / "codex-config.toml"
+        toml_path = trusted_path.replace("\\", "\\\\").replace('"', '\\"')
+        config_file.write_text(
+            f'[projects."{toml_path}"]\n'
+            'trust_level = "trusted"\n'
+        )
+        config_file.chmod(0o600)
+        files.append(AgentProvisionFile(config_file, config_path))
+
+        egress_routes: list[EgressRoute] = []
+        for host in CODEX_HOST_CREDENTIAL_HOSTS:
+            egress_routes.append(EgressRoute(
+                host=host,
+                auth_scheme="Bearer" if forward_host_credentials else "",
+                token_ref=CODEX_HOST_CREDENTIAL_TOKEN_REF if forward_host_credentials else "",
+                tls_passthrough=True,
+            ))
+
+        if forward_host_credentials:
+            _host_env = host_env or dict(os.environ)
+            provisioned_env[CODEX_HOST_CREDENTIAL_TOKEN_REF] = (
+                codex_host_access_token(_host_env)
+            )
+            auth_file = state_dir / "codex-auth.json"
+            write_codex_dummy_auth_file(auth_file, _host_env)
+            files.append(AgentProvisionFile(auth_file, f"{auth_dir}/auth.json"))
+            pre_copy.append(AgentProvisionCommand((
+                "find", auth_dir,
+                "-maxdepth", "1",
+                "-type", "f",
+                "(",
+                "-name", "*.sqlite",
+                "-o", "-name", "*.sqlite-*",
+                "-o", "-name", "*.codex-repair-*.bak",
+                ")",
+                "-delete",
+            ), "codex host credentials: could not reset runtime db files"))
+            verify.append(AgentProvisionCommand((
+                "runuser", "-u", "node", "--",
+                "env",
+                f"HOME={guest_home}",
+                f"CODEX_HOME={auth_dir}",
+                "codex", "login", "status",
+            ), (
+                "codex host credentials: dummy auth was copied into the "
+                "guest, but Codex did not accept it"
+            )))
+
+        return AgentProvisionPlan(
+            template=_RUNTIME.template,
+            command=_RUNTIME.command,
+            prompt_mode=_RUNTIME.prompt_mode,
+            image=_RUNTIME.image,
+            dockerfile=dockerfile,
+            env_vars=env_vars,
+            guest_env=resolved_guest_env,
+            dirs=tuple(dirs),
+            files=tuple(files),
+            pre_copy=tuple(pre_copy),
+            verify=tuple(verify),
+            egress_routes=tuple(egress_routes),
+            provisioned_env=provisioned_env,
+        )
+
+    def provision_skills(self, plan: "BottlePlan", bottle: "Bottle") -> None:
+        """Copy each named skill tree from `~/.claude/skills/<name>/`
+        on the host into the guest. No-op when the agent has no
+        skills."""
+        from ...backend.util import host_skill_dir
+
+        agent = plan.spec.manifest.agents[plan.spec.agent_name]
+        if not agent.skills:
+            return
+        skills_dir = _skills_dir(plan.guest_home)
+        bottle.exec(f"mkdir -p {skills_dir}", user="root")
+        for name in agent.skills:
+            src = host_skill_dir(name)
+            if not os.path.isdir(src):
+                die(
+                    f"skill {name!r} disappeared from host between "
+                    f"validation and copy at {src}."
+                )
+            dst = f"{skills_dir}/{name}"
+            info(f"copying skill {name} into {bottle.name}:{dst}")
+            bottle.exec(f"rm -rf {dst} && mkdir -p {dst}", user="root")
+            bottle.cp_in(f"{src}/.", f"{dst}/")
+            bottle.exec(f"chown -R node:node {dst}", user="root")
+
+    def provision_prompt(self, plan: "BottlePlan", bottle: "Bottle") -> str | None:
+        """Copy the prompt file into the guest, fix ownership/mode.
+        Codex reads it via the agent's `Read and follow the
+        instructions in <path>.` bootstrap (see `prompt_args`); the
+        file is copied either way so the path always exists."""
+        prompt_path = _prompt_path(plan.guest_home)
+        bottle.cp_in(str(plan.prompt_file), prompt_path)
+        bottle.exec(
+            f"chown node:node {prompt_path} && chmod 600 {prompt_path}",
+            user="root",
+        )
+        agent = plan.spec.manifest.agents[plan.spec.agent_name]
+        return prompt_path if agent.prompt else None
+
+    def provision(self, plan: "BottlePlan", bottle: "Bottle") -> None:
+        """Apply the codex-side declarative provision steps from
+        `plan.agent_provision`: the `~/.codex/` dir + config.toml
+        trust marker, plus the dummy-auth.json drop + `codex login
+        status` verify when host-credential forwarding is on."""
+        provision = plan.agent_provision
+        for d in provision.dirs:
+            path = shlex.quote(d.guest_path)
+            _exec(bottle, f"mkdir -p {path}", f"could not create {d.guest_path}")
+            _exec(
+                bottle,
+                f"chown {shlex.quote(d.owner)} {path}",
+                f"could not chown {d.guest_path}",
+            )
+            _exec(
+                bottle,
+                f"chmod {shlex.quote(d.mode)} {path}",
+                f"could not chmod {d.guest_path}",
+            )
+        for command in provision.pre_copy:
+            _exec(bottle, shlex.join(command.argv), command.error)
+        for f in provision.files:
+            bottle.cp_in(str(f.host_path), f.guest_path)
+            path = shlex.quote(f.guest_path)
+            _exec(
+                bottle,
+                f"chown {shlex.quote(f.owner)} {path}",
+                f"could not chown {f.guest_path}",
+            )
+            _exec(
+                bottle,
+                f"chmod {shlex.quote(f.mode)} {path}",
+                f"could not chmod {f.guest_path}",
+            )
+        for command in provision.verify:
+            _exec(bottle, shlex.join(command.argv), command.error)
+
+    def provision_supervise_mcp(
+        self,
+        plan: "BottlePlan",
+        bottle: "Bottle",
+        supervise_url: str,
+    ) -> None:
+        """Run `codex mcp add` inside the agent guest to register the
+        supervise sidecar in Codex's user config (~/.codex/config.toml).
+
+        Mirrors the Claude provider's `claude mcp add` flow — failure
+        is logged but not fatal."""
+        if plan.supervise_plan is None:
+            return
+        info(f"registering supervise MCP server in agent codex config → {supervise_url}")
+        r = bottle.exec(
+            f"codex mcp add --transport http "
+            f"{_SUPERVISE_MCP_NAME} {supervise_url}",
+            user="node",
+        )
+        if r.returncode != 0:
+            warn(
+                f"`codex mcp add supervise` failed (exit {r.returncode}): "
+                f"{(r.stderr or r.stdout or '').strip()}. Inside the bottle, "
+                f"register manually with: "
+                f"codex mcp add --transport http supervise {supervise_url}"
+            )
+
+
+def _exec(bottle: "Bottle", script: str, error: str) -> None:
+    result = bottle.exec(script, user="root")
+    if result.returncode != 0:
+        detail = (result.stderr or result.stdout).strip()
+        if detail:
+            detail = f": {detail}"
+        die(f"agent provider provisioning: {error}{detail}")
diff --git a/docs/prds/0050-agent-provider-contrib.md b/docs/prds/0050-agent-provider-contrib.md
new file mode 100644
index 0000000..a14b340
--- /dev/null
+++ b/docs/prds/0050-agent-provider-contrib.md
@@ -0,0 +1,401 @@
+# PRD 0050: Move provider-specific agent logic into contrib
+
+- **Status:** Active
+- **Author:** claude
+- **Created:** 2026-06-03
+- **Issue:** #177
+
+## Summary
+
+The agent provider module (`bot_bottle/agent_provider.py`) hard-codes
+the Claude- and Codex-specific provisioning rules — auth file shapes,
+trust-dialog markers, egress routes, dummy-auth dance, env vars — in a
+single `if template == "codex": ... if template == "claude": ...`
+chain (lines 154–230 today). Other pieces of provider behavior live in
+each backend's `provision/` directory (`provision_skills`,
+`provision_prompt`, `provision_provider_auth`, `provision_supervise`),
+duplicated once per backend, even though almost none of what they do
+is actually backend-specific.
+
+This PRD reshapes the agent provider into a proper plugin boundary.
+The two existing providers (Claude, Codex) move out of `agent_provider`
+into `bot_bottle/contrib/claude/` and `bot_bottle/contrib/codex/` —
+the same `contrib/` layout PRD 0048 established for the Gitea
+deploy-key provisioner. The four provisioner methods backends
+currently duplicate move into the provider plugin itself; the backend
+keeps only the bottle-side primitives (`cp_in`, `exec`) the plugin
+calls through. MCP server registration becomes a first-class part of
+the provider contract so Codex finally gets the supervise sidecar
+wired in alongside Claude.
+
+The shipping artifact is two new provider plugins under `contrib/`, a
+narrower `AgentProvider` ABC in `bot_bottle/agent_provider.py`, four
+fewer provisioner hooks on `BottleBackend`, and a supervise-MCP entry
+visible from the Codex agent at launch.
+
+## Problem
+
+Three concrete pains, all downstream of the provider abstraction not
+being where the work happens:
+
+1. **Adding a third provider is a five-file edit.** A hypothetical
+   Gemini or Aider provider has to: (a) add a branch in
+   `agent_provision_plan`, (b) add a runtime entry in `_RUNTIMES`,
+   (c) thread a `prompt_mode` enum value, (d) potentially extend
+   `provision_provider_auth` per backend, (e) wire MCP registration
+   into both `backend/docker/provision/supervise.py` and
+   `backend/smolmachines/provision/supervise.py`. Nothing about that
+   spread is load-bearing; it's leftover from when there was one
+   provider.
+
+2. **MCP server registration is Claude-only.** Both
+   `backend/docker/provision/supervise.py` and
+   `backend/smolmachines/provision/supervise.py` run `claude mcp add`
+   verbatim. Codex bottles silently get no MCP entry — the sidecar
+   is running, the routes are open, but the agent can't see the
+   tools because nothing wrote them into Codex's TOML config. Today
+   this is a latent gap. The provider plugin is the only layer that
+   knows how a given agent discovers MCP servers, so that's where
+   the registration belongs.
+
+3. **`provision_skills` / `provision_prompt` / `provision_provider_auth`
+   are duplicated between backends.** Each backend has its own
+   ~50-line copy. The differences are entirely about which path the
+   backend uses for `cp_in` and what user it `chown`s to. Same
+   business logic, two implementations, two test surfaces, two
+   places to update when the rules change.
+
+The agent_provider module is the right home for all of this. It already
+owns the `AgentProvisionPlan` (the declarative description of what
+needs to land in the guest); extending it to own the imperative
+"actually land it" step is the natural next move. Putting
+provider-specific code under `contrib/` mirrors the convention PRD 0048
+established and keeps the core package provider-agnostic.
+
+## Goals / Success Criteria
+
+1. `bot_bottle/agent_provider.py` contains no Claude- or
+   Codex-specific branches. The Claude and Codex template strings
+   themselves still live in the core module (they're the public
+   manifest values), but everything keyed off them moves out.
+2. `bot_bottle/contrib/claude/agent_provider.py` and
+   `bot_bottle/contrib/codex/agent_provider.py` exist and contain
+   the provider-specific behavior previously in lines 154–230 of
+   `agent_provider.py`. Each is reachable from the core registry via
+   a lazy import (the same pattern PRD 0048 used for
+   `GiteaDeployKeyProvisioner`).
+3. `AgentProvider` is an ABC (or protocol) with at minimum:
+   - `provision_plan(...) -> AgentProvisionPlan` — what the existing
+     `agent_provision_plan` produces today, scoped to one provider.
+   - `provision_skills(bottle, plan)` — copy host skills into the guest.
+   - `provision_prompt(bottle, plan)` — copy the prompt file, return
+     the in-guest path (or None).
+   - `provision_supervise_mcp(bottle, plan, supervise_url)` — register
+     the supervise sidecar in the provider's MCP config. No-op when
+     the bottle has no supervise sidecar.
+   - The Claude implementation runs `claude mcp add`. The Codex
+     implementation writes the corresponding entry into
+     `~/.codex/config.toml`'s `[mcp_servers.supervise]` table.
+4. `BottleBackend` loses the four abstract methods being moved
+   (`provision_skills`, `provision_prompt`, `provision_provider_auth`,
+   `provision_supervise`). `BottleBackend.provision_in_bottle` calls
+   the provider plugin directly via the bottle and plan it already
+   has. `provision_ca`, `provision_workspace`, and `provision_git`
+   stay on the backend — they're backend infrastructure, not
+   provider behavior.
+5. `bot_bottle/backend/docker/provision/{skills,prompt,provider_auth,
+   supervise}.py` and `bot_bottle/backend/smolmachines/provision/{skills,
+   prompt,provider_auth,supervise}.py` are deleted. The
+   backend-specific provisioners that remain (`ca`, `git`,
+   `workspace`) stay.
+6. A Codex bottle launched with `--supervise` shows the
+   supervise MCP server entry in its Codex config and can call
+   supervise tools from inside the bottle (egress-block,
+   pipelock-block, capability-block).
+7. Existing tests for the moved logic move with the code:
+   provider-specific tests under `tests/unit/test_contrib_claude_*.py`
+   and `tests/unit/test_contrib_codex_*.py`, mirroring
+   `tests/unit/test_contrib_gitea_deploy_key.py`.
+8. PRD 0050's Status flips Draft → Active in the same commit that
+   removes the last `if template == "claude"` branch from
+   `agent_provider.py`.
+
+## Non-goals
+
+- **A third agent provider.** This PRD reshapes the boundary so a
+  third provider is cheap to add. It does not add one.
+- **Changing the manifest surface.** The `agent.provider`
+  manifest field still takes `"claude"` or `"codex"`. The set of
+  valid strings is unchanged.
+- **Changing `AgentProvisionPlan`'s shape.** The dataclasses
+  (`AgentProvisionDir`, `AgentProvisionFile`, `AgentProvisionCommand`,
+  `AgentProvisionPlan` itself) stay in the core module and keep their
+  current fields. Provider plugins produce the same plan shape; only
+  the producer moves.
+- **Changing the supervise sidecar protocol or the supervise tool
+  surface.** PRDs 0013–0016 stay Active. What changes is how the
+  agent discovers the sidecar's MCP endpoint, not what it does once
+  connected.
+- **Per-skill provider differences.** A Codex agent and a Claude
+  agent see the same `~/.claude/skills/<name>/` tree today (Codex
+  reads it via its own skills mechanism). This PRD does not change
+  that — `provision_skills` lands the same content for both.
+- **Removing the `prompt_args` helper from `agent_provider.py`.** It
+  stays at module scope; it's already a pure dispatch on `prompt_mode`
+  and has no Claude/Codex `if` chain to extract.
+- **`provision_provider_auth` migration.** The issue notes this method
+  is "probably not needed anymore" once each provider owns its own
+  provisioning. After the move, the work that
+  `provision_provider_auth` did (apply `dirs` / `files` / `pre_copy` /
+  `verify` from the plan) becomes a shared helper the per-provider
+  `provision_skills` / `provision_prompt` calls dispatch through —
+  or, more likely, a single `provision(bottle)` entry point on the
+  provider. The hook is removed from `BottleBackend`; whether the
+  underlying loop lives on `AgentProvider` as a default
+  implementation or as a free function in `contrib/_apply.py` is
+  decided at implementation time, not in this PRD.
+
+## Scope
+
+### In scope
+
+- New `AgentProvider` ABC in `bot_bottle/agent_provider.py` with the
+  five methods listed under Goal 3. Existing `agent_provision_plan`
+  becomes `AgentProvider.provision_plan`.
+- New `bot_bottle/contrib/claude/__init__.py`,
+  `bot_bottle/contrib/claude/agent_provider.py`,
+  `bot_bottle/contrib/codex/__init__.py`,
+  `bot_bottle/contrib/codex/agent_provider.py`. Each defines a
+  `ClaudeAgentProvider` / `CodexAgentProvider` class.
+- A `get_provider(template) -> AgentProvider` registry in
+  `bot_bottle/agent_provider.py`, lazy-imported from `contrib/`,
+  mirroring `get_provisioner(provider, ...)` in
+  `bot_bottle/deploy_key_provisioner.py`.
+- Backend changes:
+  - `BottleBackend.provision_in_bottle` resolves the provider once
+    and calls `provider.provision_skills(bottle, plan)`,
+    `provider.provision_prompt(bottle, plan)`, and
+    `provider.provision_supervise_mcp(bottle, plan, url)` in place
+    of the current four abstract hooks.
+  - `BottleBackend.provision_skills`, `provision_prompt`,
+    `provision_provider_auth`, `provision_supervise` are removed.
+  - Docker and smolmachines backends remove their corresponding
+    `provision_*` implementations and the
+    `backend/<name>/provision/{skills,prompt,provider_auth,
+    supervise}.py` modules.
+- Codex MCP wiring: `CodexAgentProvider.provision_supervise_mcp`
+  writes a `[mcp_servers.supervise]` block into
+  `~/.codex/config.toml` pointing at the same agent-side supervise
+  URL the Claude provider uses. The file already exists from the
+  trust-dialog step; the MCP entry is appended (or the file is
+  rewritten in a single shot, whichever's simpler).
+- Tests migrate. Backend tests that targeted the four moved
+  provisioners are rewritten against the provider plugin, with one
+  test file per provider mirroring `tests/unit/test_contrib_gitea_*.py`.
+
+### Out of scope
+
+- Adding a manifest field for "extra MCP servers the agent should
+  see". The supervise sidecar is the only MCP server provisioned
+  today, and the issue's "Add mcp server configuring into agent
+  provision" line is about the supervise sidecar specifically. A
+  general-purpose user-declared MCP list is a follow-up if and when
+  the need surfaces.
+- Refactoring `AgentProvisionPlan`'s dataclasses. They stay byte-
+  for-byte the same so the diff is purely "who owns the producer".
+- A `BottleBackend.provision_provider_auth` shim during transition.
+  The hook is removed in one cut; the only caller is the backend
+  itself, no manifest consumers reference it.
+- Renaming `agent_provider.py` → `agent_providers/`. The module
+  still has core dataclasses + the ABC + the registry; it's a single
+  file's worth of code.
+
+## Proposed design
+
+### Module shape after the cut
+
+```
+bot_bottle/agent_provider.py
+  PROVIDER_CLAUDE, PROVIDER_CODEX, PROVIDER_TEMPLATES
+  PromptMode  (Literal)
+  AgentProvisionDir, AgentProvisionFile, AgentProvisionCommand,
+    AgentProvisionPlan  (dataclasses, unchanged)
+  AgentProviderRuntime  (dataclass — template/command/image/etc.)
+  AgentProvider  (ABC)
+    .runtime() -> AgentProviderRuntime
+    .provision_plan(state_dir, ..., trusted_project_path, ...) -> AgentProvisionPlan
+    .provision_skills(bottle, plan) -> None
+    .provision_prompt(bottle, plan) -> str | None
+    .provision_supervise_mcp(bottle, plan, supervise_url) -> None
+  get_provider(template: str) -> AgentProvider     # lazy-imports contrib
+  prompt_args(prompt_mode, prompt_path, *, argv)   # unchanged
+
+bot_bottle/contrib/claude/agent_provider.py
+  ClaudeAgentProvider(AgentProvider)
+    _RUNTIME = AgentProviderRuntime(template="claude", ...)
+    .provision_plan(...)         # owns the lines-204–230 chunk
+    .provision_skills(...)       # was backend/<name>/provision/skills.py
+    .provision_prompt(...)       # was backend/<name>/provision/prompt.py
+    .provision_supervise_mcp(...)# was backend/<name>/provision/supervise.py
+
+bot_bottle/contrib/codex/agent_provider.py
+  CodexAgentProvider(AgentProvider)
+    _RUNTIME = AgentProviderRuntime(template="codex", ...)
+    .provision_plan(...)         # owns the lines-154–204 chunk
+    .provision_skills(...)       # same as Claude impl, factored to shared helper
+    .provision_prompt(...)       # same as Claude impl, factored to shared helper
+    .provision_supervise_mcp(...)# writes [mcp_servers.supervise] to config.toml
+```
+
+The skills / prompt / provider-auth-apply implementations are 99%
+identical across providers — `cp_in` then `chown` / `chmod`. They are
+extracted to small free functions in
+`bot_bottle/contrib/_provision_apply.py` (or kept as default
+implementations on `AgentProvider` if every concrete subclass would
+just call them). Picked at implementation time; both options match
+PRD 0048's contrib convention. The visible contract is that
+provisioning lives on the provider plugin.
+
+### MCP registration for Codex
+
+Codex reads MCP servers from `~/.codex/config.toml` (or whatever
+`CODEX_HOME/config.toml` resolves to). The provider already writes
+this file once during `provision_plan` to set the project trust
+level. `CodexAgentProvider.provision_supervise_mcp` extends the
+existing write: same path, append a `[mcp_servers.supervise]` table
+pointing at the agent-side supervise URL.
+
+Two implementation routes worth flagging:
+
+- **Option A:** Pre-bake the MCP entry in the same config-write that
+  happens during `provision_plan`, before bottle launch. Simpler;
+  the supervise URL has to be known at plan time, which means
+  `provision_plan` needs the supervise URL (or a sentinel that means
+  "fill this in"). The smolmachines backend already plumbs
+  `agent_supervise_url` through to its provision_supervise step, so
+  the value is available.
+- **Option B:** Append at bottle-launch time via a `bottle.exec`
+  that writes to the file inside the guest, matching the
+  `claude mcp add` flow. Slower but uniform with how
+  `ClaudeAgentProvider.provision_supervise_mcp` works.
+
+Option B is the symmetric choice and the one this PRD assumes.
+The implementer can switch to A if Option B turns out to need a
+TOML-merge primitive the codebase doesn't already have.
+
+### Backend after the cut
+
+```python
+class BottleBackend:
+    def provision_in_bottle(self, plan, bottle, supervise_url):
+        provider = get_provider(plan.spec.manifest.agents[
+            plan.spec.agent_name].provider)
+        self.provision_ca(plan, bottle)
+        prompt_path = provider.provision_prompt(bottle, plan)
+        provider.provision_skills(bottle, plan)
+        self.provision_workspace(plan, bottle)
+        self.provision_git(plan, bottle)
+        provider.provision_supervise_mcp(bottle, plan, supervise_url)
+        return prompt_path
+```
+
+`supervise_url` is the existing per-backend "where does the agent
+reach the sidecar from inside the guest" value. The Docker backend
+passes `http://supervise:<port>/`; smolmachines passes the
+`http://127.0.0.1:<port>/` it already computed. The backend's only
+remaining provider-touching duty is "tell the provider what the
+sidecar URL is".
+
+### Registry
+
+```python
+# bot_bottle/agent_provider.py
+def get_provider(template: str) -> AgentProvider:
+    if template == PROVIDER_CLAUDE:
+        from bot_bottle.contrib.claude.agent_provider import (
+            ClaudeAgentProvider,
+        )
+        return ClaudeAgentProvider()
+    if template == PROVIDER_CODEX:
+        from bot_bottle.contrib.codex.agent_provider import (
+            CodexAgentProvider,
+        )
+        return CodexAgentProvider()
+    raise ValueError(f"unknown agent provider template: {template!r}")
+```
+
+Lazy imports keep core import-time graph small and match PRD 0048.
+
+## Implementation chunks
+
+Each chunk is one commit on the PR; the PR ships as one cut.
+
+1. **Lift `AgentProvider` ABC + registry.** Add the ABC and
+   `get_provider` next to the existing `agent_provision_plan`
+   function. Have `agent_provision_plan` delegate to
+   `get_provider(template).provision_plan(...)` so callers keep
+   working through the transition.
+2. **Move provider-specific `provision_plan` content into
+   contrib.** Create `contrib/claude/` and `contrib/codex/`. The
+   Claude and Codex branches of `agent_provision_plan` move into
+   the respective provider classes. The shared scaffolding
+   (initial dict setup, final `AgentProvisionPlan(...)` return)
+   stays in the ABC as a template method or moves into each
+   subclass — whichever needs less indirection.
+3. **Move backend provisioners onto the provider.** Add
+   `provision_skills`, `provision_prompt`, `provision_supervise_mcp`
+   to `AgentProvider` (with a shared apply helper for skills /
+   prompt). Update `BottleBackend.provision_in_bottle` to call them.
+   Delete the four backend hook methods and the eight
+   `backend/<name>/provision/{skills,prompt,provider_auth,supervise}.py`
+   modules.
+4. **Add Codex MCP support.** Implement
+   `CodexAgentProvider.provision_supervise_mcp` against
+   `~/.codex/config.toml`. Add a unit test that runs the method
+   against an in-memory FakeBottle and asserts the
+   `[mcp_servers.supervise]` block is present.
+5. **Migrate tests.** Per-backend tests for the moved
+   provisioners turn into per-provider tests under
+   `tests/unit/test_contrib_claude_*.py` and
+   `tests/unit/test_contrib_codex_*.py`. Keep one integration-style
+   test per backend that confirms `provision_in_bottle` still
+   reaches every step.
+6. **Activate.** Flip Status: Draft → Active in this PRD; close
+   #177 on merge.
+
+## Open questions (resolved)
+
+1. **`codex mcp add` exists.** Implementation calls
+   `codex mcp add --transport http supervise <url>` as `node` —
+   symmetric with `claude mcp add` (no `--scope user`; Codex writes
+   `~/.codex/config.toml` by default). Failure logs a warning; the
+   bottle still works without the entry.
+2. **Each provider owns its apply steps end-to-end.** The base
+   ABC declares `provision_skills` / `provision_prompt` /
+   `provision` as abstract; each concrete provider implements its
+   own copy loop. No shared `_provision_apply.py`. The apply
+   sequences look similar today, but Claude and Codex harnesses
+   diverge over time (codex already grew a dummy-auth dance + a
+   `codex login status` verify with no Claude analogue) and the
+   "shared because both happen to call cp_in then chown" coupling
+   would just rot. Duplication is intentional.
+3. **Env knobs removed.** `BOT_BOTTLE_CONTAINER_HOME`,
+   `BOT_BOTTLE_GUEST_HOME`, `BOT_BOTTLE_CONTAINER_SKILLS_DIR`, and
+   `BOT_BOTTLE_GUEST_SKILLS_DIR` are gone; `/home/node` is hardcoded
+   everywhere it was read. The values were effectively constants;
+   the knobs added surface area for no real flexibility.
+
+## References
+
+- Issue
+  [#177](https://gitea.dideric.is/didericis/bot-bottle/issues/177)
+  — the request: move provider logic into contrib, add MCP
+  configuration to agent provision, rename provision_supervise →
+  provision_supervise_mcp, ensure Codex gets MCP provisioned.
+- PRD 0013 — supervise plane foundation (defines the MCP-discoverable
+  block-remediation tools this PRD makes available to Codex).
+- PRD 0048 — SSH deploy key provisioning (the `contrib/` convention
+  this PRD follows).
+- Current source:
+  [agent_provider.py L154-L230](https://gitea.dideric.is/didericis/bot-bottle/src/branch/main/bot_bottle/agent_provider.py#L154-L230)
+  — the provider-specific block this PRD relocates to contrib.
diff --git a/tests/unit/test_agent_provider.py b/tests/unit/test_agent_provider.py
index 216e3f2..dd5a211 100644
--- a/tests/unit/test_agent_provider.py
+++ b/tests/unit/test_agent_provider.py
@@ -27,6 +27,7 @@ class TestAgentProviderRuntime(unittest.TestCase):
     def test_codex_plan_declares_home_state(self):
         with tempfile.TemporaryDirectory(prefix="bb-provider.") as tmp:
             plan = agent_provision_plan(
+                guest_home="/home/node",
                 template="codex",
                 dockerfile="/tmp/Dockerfile.codex",
                 state_dir=Path(tmp),
@@ -51,6 +52,7 @@ class TestAgentProviderRuntime(unittest.TestCase):
     def test_codex_trusts_requested_project_path(self):
         with tempfile.TemporaryDirectory(prefix="bb-provider.") as tmp:
             agent_provision_plan(
+                guest_home="/home/node",
                 template="codex",
                 dockerfile="",
                 state_dir=Path(tmp),
@@ -68,6 +70,7 @@ class TestAgentProviderRuntime(unittest.TestCase):
                 "tokens": {"access_token": _jwt(2000000000)},
             }))
             plan = agent_provision_plan(
+                guest_home="/home/node",
                 template="codex",
                 dockerfile="",
                 state_dir=Path(tmp),
@@ -87,6 +90,7 @@ class TestAgentProviderRuntime(unittest.TestCase):
     def test_claude_with_auth_token_injects_provider_route_and_placeholder(self):
         with tempfile.TemporaryDirectory(prefix="bb-provider.") as tmp:
             plan = agent_provision_plan(
+                guest_home="/home/node",
                 template="claude",
                 dockerfile="/tmp/Dockerfile.claude",
                 state_dir=Path(tmp),
@@ -109,6 +113,7 @@ class TestAgentProviderRuntime(unittest.TestCase):
     def test_claude_trusts_requested_project_path(self):
         with tempfile.TemporaryDirectory(prefix="bb-provider.") as tmp:
             agent_provision_plan(
+                guest_home="/home/node",
                 template="claude",
                 dockerfile="",
                 state_dir=Path(tmp),
@@ -127,6 +132,7 @@ class TestAgentProviderRuntime(unittest.TestCase):
                 "tokens": {"access_token": _jwt(2000000000)},
             }))
             plan = agent_provision_plan(
+                guest_home="/home/node",
                 template="codex",
                 dockerfile="",
                 state_dir=Path(tmp),
@@ -143,6 +149,7 @@ class TestAgentProviderRuntime(unittest.TestCase):
     def test_codex_without_forward_host_credentials_has_passthrough_egress_routes(self):
         with tempfile.TemporaryDirectory(prefix="bb-provider.") as tmp:
             plan = agent_provision_plan(
+                guest_home="/home/node",
                 template="codex",
                 dockerfile="",
                 state_dir=Path(tmp),
@@ -160,6 +167,7 @@ class TestAgentProviderRuntime(unittest.TestCase):
     def test_claude_without_auth_token_has_passthrough_egress_route(self):
         with tempfile.TemporaryDirectory(prefix="bb-provider.") as tmp:
             plan = agent_provision_plan(
+                guest_home="/home/node",
                 template="claude",
                 dockerfile="",
                 state_dir=Path(tmp),
@@ -183,6 +191,7 @@ class TestAgentProviderRuntime(unittest.TestCase):
                 "tokens": {"access_token": access},
             }))
             plan = agent_provision_plan(
+                guest_home="/home/node",
                 template="codex",
                 dockerfile="",
                 state_dir=Path(tmp),
@@ -197,6 +206,7 @@ class TestAgentProviderRuntime(unittest.TestCase):
     def test_codex_without_forward_host_credentials_has_empty_provisioned_env(self):
         with tempfile.TemporaryDirectory(prefix="bb-provider.") as tmp:
             plan = agent_provision_plan(
+                guest_home="/home/node",
                 template="codex",
                 dockerfile="",
                 state_dir=Path(tmp),
diff --git a/tests/unit/test_compose.py b/tests/unit/test_compose.py
index b566dec..b147c3e 100644
--- a/tests/unit/test_compose.py
+++ b/tests/unit/test_compose.py
@@ -164,6 +164,7 @@ def _plan(
 
     spec = _spec(supervise=supervise, with_git=with_git, with_egress=with_egress)
     return DockerBottlePlan(
+        guest_home="/home/node",
         spec=spec,
         stage_dir=STAGE,
         slug=SLUG,
diff --git a/tests/unit/test_contrib_claude_provider.py b/tests/unit/test_contrib_claude_provider.py
new file mode 100644
index 0000000..a79fada
--- /dev/null
+++ b/tests/unit/test_contrib_claude_provider.py
@@ -0,0 +1,303 @@
+"""Unit: ClaudeAgentProvider provisioning (PRD 0050, contrib/claude).
+
+Each provider owns its own in-guest provisioning end-to-end —
+skills copy, prompt copy, declarative dirs/files/pre_copy/verify
+apply, and supervise MCP registration. The Claude / Codex paths
+intentionally don't share a helper module: harness changes on
+either side are expected to diverge the implementations."""
+
+from __future__ import annotations
+
+import unittest
+from pathlib import Path
+from unittest.mock import MagicMock, patch
+
+from bot_bottle.agent_provider import (
+    AgentProvisionCommand,
+    AgentProvisionDir,
+    AgentProvisionFile,
+    AgentProvisionPlan,
+)
+from bot_bottle.backend import Bottle, BottleSpec, ExecResult
+from bot_bottle.backend.docker.bottle_plan import DockerBottlePlan
+from bot_bottle.contrib.claude.agent_provider import ClaudeAgentProvider
+from bot_bottle.egress import EgressPlan
+from bot_bottle.git_gate import GitGatePlan
+from bot_bottle.manifest import Manifest
+from bot_bottle.pipelock import PipelockProxyPlan
+from bot_bottle.supervise import SupervisePlan
+from bot_bottle.workspace import workspace_plan
+
+
+_URL = "http://supervise:9100/"
+
+
+def _make_bottle(exec_result: ExecResult | None = None) -> MagicMock:
+    bottle = MagicMock(spec=Bottle)
+    bottle.name = "bot-bottle-demo-abc12"
+    bottle.exec.return_value = (
+        exec_result if exec_result is not None
+        else ExecResult(returncode=0, stdout="", stderr="")
+    )
+    return bottle
+
+
+def _exec_scripts(bottle: MagicMock) -> list[str]:
+    return [c.args[0] for c in bottle.exec.call_args_list]
+
+
+def _plan(
+    *,
+    agent_prompt: str = "",
+    skills: list[str] | None = None,
+    agent_provision: AgentProvisionPlan | None = None,
+    supervise: bool = False,
+) -> DockerBottlePlan:
+    bottle_json: dict = {"agent_provider": {"template": "claude"}}
+    if supervise:
+        bottle_json["supervise"] = True
+    manifest = Manifest.from_json_obj({
+        "bottles": {"dev": bottle_json},
+        "agents": {
+            "demo": {
+                "skills": list(skills or []),
+                "prompt": agent_prompt,
+                "bottle": "dev",
+            },
+        },
+    })
+    spec = BottleSpec(
+        manifest=manifest, agent_name="demo",
+        copy_cwd=False, user_cwd="/tmp/x",
+    )
+    supervise_plan = None
+    if supervise:
+        supervise_plan = SupervisePlan(
+            slug="demo-abc12",
+            queue_dir=Path("/tmp/queue"),
+            current_config_dir=Path("/tmp/current-config"),
+        )
+    return DockerBottlePlan(
+        guest_home="/home/node",
+        spec=spec,
+        stage_dir=Path("/tmp/stage"),
+        slug="demo-abc12",
+        container_name="bot-bottle-demo-abc12",
+        container_name_pinned=False,
+        image="bot-bottle-claude:latest",
+        derived_image="",
+        runtime_image="bot-bottle-claude:latest",
+        dockerfile_path="",
+        env_file=Path("/tmp/agent.env"),
+        forwarded_env={},
+        prompt_file=Path("/tmp/state/demo-abc12/agent/prompt.txt"),
+        proxy_plan=PipelockProxyPlan(
+            yaml_path=Path("/tmp/pipelock.yaml"), slug="demo-abc12",
+        ),
+        git_gate_plan=GitGatePlan(
+            slug="demo-abc12",
+            entrypoint_script=Path("/tmp/git-gate-entrypoint.sh"),
+            hook_script=Path("/tmp/git-gate-hook"),
+            access_hook_script=Path("/tmp/git-gate-access-hook"),
+            upstreams=(),
+        ),
+        egress_plan=EgressPlan(
+            slug="demo-abc12",
+            routes_path=Path("/tmp/routes.yaml"),
+            routes=(),
+            token_env_map={},
+        ),
+        supervise_plan=supervise_plan,
+        use_runsc=False,
+        agent_provision=agent_provision or AgentProvisionPlan(
+            template="claude", command="claude", prompt_mode="append_file",
+            image="", dockerfile="", guest_env={},
+        ),
+        workspace_plan=workspace_plan(spec, guest_home="/home/node"),
+    )
+
+
+class TestClaudeProvisionPrompt(unittest.TestCase):
+    def test_cp_uses_bottle_cp_in(self):
+        bottle = _make_bottle()
+        ClaudeAgentProvider().provision_prompt(_plan(), bottle)
+        bottle.cp_in.assert_called_once_with(
+            "/tmp/state/demo-abc12/agent/prompt.txt",
+            "/home/node/.bot-bottle-prompt.txt",
+        )
+
+    def test_returns_path_when_agent_has_prompt(self):
+        bottle = _make_bottle()
+        r = ClaudeAgentProvider().provision_prompt(
+            _plan(agent_prompt="You are helpful."), bottle,
+        )
+        self.assertEqual("/home/node/.bot-bottle-prompt.txt", r)
+
+    def test_returns_none_when_agent_has_no_prompt(self):
+        bottle = _make_bottle()
+        r = ClaudeAgentProvider().provision_prompt(_plan(agent_prompt=""), bottle)
+        self.assertIsNone(r)
+        bottle.cp_in.assert_called_once()
+
+    def test_chowns_to_node_after_copy(self):
+        bottle = _make_bottle()
+        ClaudeAgentProvider().provision_prompt(_plan(), bottle)
+        scripts = _exec_scripts(bottle)
+        self.assertTrue(
+            any("chown node:node" in s
+                and "/home/node/.bot-bottle-prompt.txt" in s
+                for s in scripts)
+        )
+        self.assertTrue(
+            any("chmod 600" in s
+                and "/home/node/.bot-bottle-prompt.txt" in s
+                for s in scripts)
+        )
+
+
+class TestClaudeProvisionSkills(unittest.TestCase):
+    def test_noop_when_agent_has_no_skills(self):
+        bottle = _make_bottle()
+        ClaudeAgentProvider().provision_skills(_plan(skills=[]), bottle)
+        bottle.cp_in.assert_not_called()
+        bottle.exec.assert_not_called()
+
+    def test_mkdir_plus_cp_per_skill(self):
+        bottle = _make_bottle()
+        with patch(
+            "bot_bottle.backend.util.host_skill_dir",
+            side_effect=lambda n: f"/host/skills/{n}",
+        ), patch(
+            "bot_bottle.contrib.claude.agent_provider.os.path.isdir",
+            return_value=True,
+        ):
+            ClaudeAgentProvider().provision_skills(
+                _plan(skills=["init-prd", "verify"]), bottle,
+            )
+        scripts = _exec_scripts(bottle)
+        self.assertTrue(
+            any("mkdir -p" in s and "/home/node/.claude/skills" in s
+                for s in scripts)
+        )
+        cp_targets = {c.args[1] for c in bottle.cp_in.call_args_list}
+        self.assertEqual({
+            "/home/node/.claude/skills/init-prd/",
+            "/home/node/.claude/skills/verify/",
+        }, cp_targets)
+        self.assertEqual(
+            2, sum(1 for s in scripts if "chown -R node:node" in s),
+        )
+
+    def test_missing_skill_dies(self):
+        bottle = _make_bottle()
+        with patch(
+            "bot_bottle.backend.util.host_skill_dir",
+            side_effect=lambda n: f"/host/skills/{n}",
+        ), patch(
+            "bot_bottle.contrib.claude.agent_provider.os.path.isdir",
+            return_value=False,
+        ):
+            with self.assertRaises(SystemExit):
+                ClaudeAgentProvider().provision_skills(
+                    _plan(skills=["init-prd"]), bottle,
+                )
+
+
+class TestClaudeProvision(unittest.TestCase):
+    """The declarative dirs/files/pre_copy/verify apply loop for
+    the claude.json trust marker."""
+
+    def test_noop_on_empty_provision_plan(self):
+        bottle = _make_bottle()
+        ClaudeAgentProvider().provision(_plan(), bottle)
+        bottle.cp_in.assert_not_called()
+        bottle.exec.assert_not_called()
+
+    def test_copies_files_and_chowns(self):
+        provision = AgentProvisionPlan(
+            template="claude", command="claude", prompt_mode="append_file",
+            image="", dockerfile="", guest_env={},
+            files=(AgentProvisionFile(
+                Path("/tmp/claude.json"), "/home/node/.claude.json",
+            ),),
+        )
+        bottle = _make_bottle()
+        ClaudeAgentProvider().provision(
+            _plan(agent_provision=provision), bottle,
+        )
+        bottle.cp_in.assert_called_once_with(
+            "/tmp/claude.json", "/home/node/.claude.json",
+        )
+        scripts = _exec_scripts(bottle)
+        self.assertTrue(
+            any("chown" in s and "/home/node/.claude.json" in s for s in scripts)
+        )
+        self.assertTrue(
+            any("chmod" in s and "/home/node/.claude.json" in s for s in scripts)
+        )
+
+    def test_dies_when_file_chown_fails(self):
+        provision = AgentProvisionPlan(
+            template="claude", command="claude", prompt_mode="append_file",
+            image="", dockerfile="", guest_env={},
+            files=(AgentProvisionFile(
+                Path("/tmp/claude.json"), "/home/node/.claude.json",
+            ),),
+        )
+        bottle = _make_bottle(
+            exec_result=ExecResult(1, "", "chown: no such file\n"),
+        )
+        with self.assertRaises(SystemExit):
+            ClaudeAgentProvider().provision(
+                _plan(agent_provision=provision), bottle,
+            )
+
+    def test_runs_verify_commands(self):
+        provision = AgentProvisionPlan(
+            template="claude", command="claude", prompt_mode="append_file",
+            image="", dockerfile="", guest_env={},
+            verify=(AgentProvisionCommand(
+                ("/usr/bin/true",), "verify failed",
+            ),),
+        )
+        bottle = _make_bottle()
+        ClaudeAgentProvider().provision(
+            _plan(agent_provision=provision), bottle,
+        )
+        scripts = _exec_scripts(bottle)
+        self.assertTrue(any("/usr/bin/true" in s for s in scripts))
+
+
+class TestClaudeSuperviseMcp(unittest.TestCase):
+    def test_noop_when_supervise_disabled(self):
+        bottle = _make_bottle()
+        ClaudeAgentProvider().provision_supervise_mcp(
+            _plan(supervise=False), bottle, _URL,
+        )
+        bottle.exec.assert_not_called()
+
+    def test_runs_claude_mcp_add_as_node(self):
+        bottle = _make_bottle()
+        ClaudeAgentProvider().provision_supervise_mcp(
+            _plan(supervise=True), bottle, _URL,
+        )
+        bottle.exec.assert_called_once()
+        script = bottle.exec.call_args.args[0]
+        self.assertEqual("node", bottle.exec.call_args.kwargs.get("user"))
+        self.assertIn("claude mcp add", script)
+        self.assertIn("--scope user", script)
+        self.assertIn("--transport http", script)
+        self.assertIn("supervise", script)
+        self.assertIn(_URL, script)
+
+    def test_logs_warning_on_failure_but_does_not_raise(self):
+        bottle = _make_bottle(
+            exec_result=ExecResult(returncode=1, stdout="", stderr="boom"),
+        )
+        ClaudeAgentProvider().provision_supervise_mcp(
+            _plan(supervise=True), bottle, _URL,
+        )
+
+
+if __name__ == "__main__":
+    unittest.main()
diff --git a/tests/unit/test_contrib_codex_provider.py b/tests/unit/test_contrib_codex_provider.py
new file mode 100644
index 0000000..c229ea8
--- /dev/null
+++ b/tests/unit/test_contrib_codex_provider.py
@@ -0,0 +1,271 @@
+"""Unit: CodexAgentProvider provisioning (PRD 0050, contrib/codex).
+
+The Codex provider owns its own skills / prompt / provision /
+supervise-mcp end-to-end — symmetric with the claude provider but
+not sharing a helper module, since codex's apply steps include
+the dummy-auth dance and a `codex login status` verify that have
+no claude equivalent."""
+
+from __future__ import annotations
+
+import unittest
+from pathlib import Path
+from unittest.mock import MagicMock, patch
+
+from bot_bottle.agent_provider import (
+    AgentProvisionCommand,
+    AgentProvisionDir,
+    AgentProvisionFile,
+    AgentProvisionPlan,
+)
+from bot_bottle.backend import Bottle, BottleSpec, ExecResult
+from bot_bottle.backend.docker.bottle_plan import DockerBottlePlan
+from bot_bottle.contrib.codex.agent_provider import CodexAgentProvider
+from bot_bottle.egress import EgressPlan
+from bot_bottle.git_gate import GitGatePlan
+from bot_bottle.manifest import Manifest
+from bot_bottle.pipelock import PipelockProxyPlan
+from bot_bottle.supervise import SupervisePlan
+from bot_bottle.workspace import workspace_plan
+
+
+_URL = "http://supervise:9100/"
+
+
+def _make_bottle(exec_result: ExecResult | None = None) -> MagicMock:
+    bottle = MagicMock(spec=Bottle)
+    bottle.name = "bot-bottle-demo-abc12"
+    bottle.exec.return_value = (
+        exec_result if exec_result is not None
+        else ExecResult(returncode=0, stdout="", stderr="")
+    )
+    return bottle
+
+
+def _exec_scripts(bottle: MagicMock) -> list[str]:
+    return [c.args[0] for c in bottle.exec.call_args_list]
+
+
+def _plan(
+    *,
+    agent_prompt: str = "",
+    skills: list[str] | None = None,
+    agent_provision: AgentProvisionPlan | None = None,
+    supervise: bool = False,
+) -> DockerBottlePlan:
+    bottle_json: dict = {"agent_provider": {"template": "codex"}}
+    if supervise:
+        bottle_json["supervise"] = True
+    manifest = Manifest.from_json_obj({
+        "bottles": {"dev": bottle_json},
+        "agents": {
+            "demo": {
+                "skills": list(skills or []),
+                "prompt": agent_prompt,
+                "bottle": "dev",
+            },
+        },
+    })
+    spec = BottleSpec(
+        manifest=manifest, agent_name="demo",
+        copy_cwd=False, user_cwd="/tmp/x",
+    )
+    supervise_plan = None
+    if supervise:
+        supervise_plan = SupervisePlan(
+            slug="demo-abc12",
+            queue_dir=Path("/tmp/queue"),
+            current_config_dir=Path("/tmp/current-config"),
+        )
+    return DockerBottlePlan(
+        guest_home="/home/node",
+        spec=spec,
+        stage_dir=Path("/tmp/stage"),
+        slug="demo-abc12",
+        container_name="bot-bottle-demo-abc12",
+        container_name_pinned=False,
+        image="bot-bottle-codex:latest",
+        derived_image="",
+        runtime_image="bot-bottle-codex:latest",
+        dockerfile_path="",
+        env_file=Path("/tmp/agent.env"),
+        forwarded_env={},
+        prompt_file=Path("/tmp/state/demo-abc12/agent/prompt.txt"),
+        proxy_plan=PipelockProxyPlan(
+            yaml_path=Path("/tmp/pipelock.yaml"), slug="demo-abc12",
+        ),
+        git_gate_plan=GitGatePlan(
+            slug="demo-abc12",
+            entrypoint_script=Path("/tmp/git-gate-entrypoint.sh"),
+            hook_script=Path("/tmp/git-gate-hook"),
+            access_hook_script=Path("/tmp/git-gate-access-hook"),
+            upstreams=(),
+        ),
+        egress_plan=EgressPlan(
+            slug="demo-abc12",
+            routes_path=Path("/tmp/routes.yaml"),
+            routes=(),
+            token_env_map={},
+        ),
+        supervise_plan=supervise_plan,
+        use_runsc=False,
+        agent_provision=agent_provision or AgentProvisionPlan(
+            template="codex", command="codex", prompt_mode="read_prompt_file",
+            image="", dockerfile="", guest_env={},
+        ),
+        workspace_plan=workspace_plan(spec, guest_home="/home/node"),
+    )
+
+
+class TestCodexProvisionPrompt(unittest.TestCase):
+    def test_cp_uses_bottle_cp_in_and_chowns(self):
+        bottle = _make_bottle()
+        r = CodexAgentProvider().provision_prompt(
+            _plan(agent_prompt="hello"), bottle,
+        )
+        self.assertEqual("/home/node/.bot-bottle-prompt.txt", r)
+        bottle.cp_in.assert_called_once_with(
+            "/tmp/state/demo-abc12/agent/prompt.txt",
+            "/home/node/.bot-bottle-prompt.txt",
+        )
+        scripts = _exec_scripts(bottle)
+        self.assertTrue(
+            any("chown node:node" in s
+                and "/home/node/.bot-bottle-prompt.txt" in s
+                for s in scripts)
+        )
+
+    def test_returns_none_when_agent_has_no_prompt(self):
+        bottle = _make_bottle()
+        r = CodexAgentProvider().provision_prompt(_plan(agent_prompt=""), bottle)
+        self.assertIsNone(r)
+        bottle.cp_in.assert_called_once()
+
+
+class TestCodexProvisionSkills(unittest.TestCase):
+    def test_noop_when_agent_has_no_skills(self):
+        bottle = _make_bottle()
+        CodexAgentProvider().provision_skills(_plan(skills=[]), bottle)
+        bottle.cp_in.assert_not_called()
+        bottle.exec.assert_not_called()
+
+    def test_mkdir_plus_cp_per_skill(self):
+        bottle = _make_bottle()
+        with patch(
+            "bot_bottle.backend.util.host_skill_dir",
+            side_effect=lambda n: f"/host/skills/{n}",
+        ), patch(
+            "bot_bottle.contrib.codex.agent_provider.os.path.isdir",
+            return_value=True,
+        ):
+            CodexAgentProvider().provision_skills(
+                _plan(skills=["init-prd"]), bottle,
+            )
+        scripts = _exec_scripts(bottle)
+        self.assertTrue(
+            any("mkdir -p" in s and "/home/node/.claude/skills" in s
+                for s in scripts)
+        )
+        bottle.cp_in.assert_called_once()
+        self.assertEqual(
+            "/home/node/.claude/skills/init-prd/",
+            bottle.cp_in.call_args.args[1],
+        )
+
+
+class TestCodexProvision(unittest.TestCase):
+    """Codex's declarative provision step: ~/.codex/ dir + config.toml
+    + (optional) dummy-auth.json + `codex login status` verify."""
+
+    def test_creates_dir_and_copies_config(self):
+        provision = AgentProvisionPlan(
+            template="codex", command="codex",
+            prompt_mode="read_prompt_file",
+            image="", dockerfile="", guest_env={},
+            dirs=(AgentProvisionDir("/home/node/.codex"),),
+            files=(AgentProvisionFile(
+                Path("/tmp/codex-config.toml"),
+                "/home/node/.codex/config.toml",
+            ),),
+        )
+        bottle = _make_bottle()
+        CodexAgentProvider().provision(
+            _plan(agent_provision=provision), bottle,
+        )
+        bottle.cp_in.assert_called_once_with(
+            "/tmp/codex-config.toml",
+            "/home/node/.codex/config.toml",
+        )
+        scripts = _exec_scripts(bottle)
+        self.assertTrue(any("mkdir -p" in s and "/home/node/.codex" in s for s in scripts))
+        self.assertTrue(any("chown" in s and "/home/node/.codex/config.toml" in s for s in scripts))
+        self.assertTrue(any("chmod" in s and "/home/node/.codex/config.toml" in s for s in scripts))
+
+    def test_runs_pre_copy_then_verify(self):
+        provision = AgentProvisionPlan(
+            template="codex", command="codex",
+            prompt_mode="read_prompt_file",
+            image="", dockerfile="", guest_env={},
+            pre_copy=(AgentProvisionCommand(
+                ("find", "/home/node/.codex", "-name", "*.sqlite", "-delete"),
+                "could not reset runtime db files",
+            ),),
+            verify=(AgentProvisionCommand(
+                ("runuser", "-u", "node", "--", "codex", "login", "status"),
+                "codex rejected the dummy auth",
+            ),),
+        )
+        bottle = _make_bottle()
+        CodexAgentProvider().provision(
+            _plan(agent_provision=provision), bottle,
+        )
+        scripts = _exec_scripts(bottle)
+        self.assertTrue(any("find" in s and "-delete" in s for s in scripts))
+        self.assertTrue(any("runuser" in s and "codex login status" in s for s in scripts))
+
+    def test_dies_when_dir_creation_fails(self):
+        provision = AgentProvisionPlan(
+            template="codex", command="codex",
+            prompt_mode="read_prompt_file",
+            image="", dockerfile="", guest_env={},
+            dirs=(AgentProvisionDir("/home/node/.codex"),),
+        )
+        bottle = _make_bottle(exec_result=ExecResult(1, "", "mkdir: nope\n"))
+        with self.assertRaises(SystemExit):
+            CodexAgentProvider().provision(
+                _plan(agent_provision=provision), bottle,
+            )
+
+
+class TestCodexSuperviseMcp(unittest.TestCase):
+    def test_noop_when_supervise_disabled(self):
+        bottle = _make_bottle()
+        CodexAgentProvider().provision_supervise_mcp(
+            _plan(supervise=False), bottle, _URL,
+        )
+        bottle.exec.assert_not_called()
+
+    def test_runs_codex_mcp_add_as_node(self):
+        bottle = _make_bottle()
+        CodexAgentProvider().provision_supervise_mcp(
+            _plan(supervise=True), bottle, _URL,
+        )
+        bottle.exec.assert_called_once()
+        script = bottle.exec.call_args.args[0]
+        self.assertEqual("node", bottle.exec.call_args.kwargs.get("user"))
+        self.assertIn("codex mcp add", script)
+        self.assertIn("--transport http", script)
+        self.assertIn("supervise", script)
+        self.assertIn(_URL, script)
+
+    def test_logs_warning_on_failure_but_does_not_raise(self):
+        bottle = _make_bottle(
+            exec_result=ExecResult(returncode=1, stdout="", stderr="boom"),
+        )
+        CodexAgentProvider().provision_supervise_mcp(
+            _plan(supervise=True), bottle, _URL,
+        )
+
+
+if __name__ == "__main__":
+    unittest.main()
diff --git a/tests/unit/test_docker_launch_teardown.py b/tests/unit/test_docker_launch_teardown.py
index 8e669d0..73b3b1e 100644
--- a/tests/unit/test_docker_launch_teardown.py
+++ b/tests/unit/test_docker_launch_teardown.py
@@ -44,6 +44,7 @@ def _plan(tmp: str) -> DockerBottlePlan:
         identity="test-teardown-00001",
     )
     return DockerBottlePlan(
+        guest_home="/home/node",
         spec=spec,
         stage_dir=stage,
         git_gate_plan=GitGatePlan(
diff --git a/tests/unit/test_docker_provision_git_user.py b/tests/unit/test_docker_provision_git_user.py
index 2b0ea85..c83dd92 100644
--- a/tests/unit/test_docker_provision_git_user.py
+++ b/tests/unit/test_docker_provision_git_user.py
@@ -40,6 +40,7 @@ def _plan(*, git_user: dict | None = None,
         copy_cwd=copy_cwd, user_cwd=user_cwd,
     )
     return DockerBottlePlan(
+        guest_home="/home/node",
         spec=spec,
         stage_dir=stage_dir or Path("/tmp/stage"),
         slug="demo-abc12",
diff --git a/tests/unit/test_docker_provision_provider_auth.py b/tests/unit/test_docker_provision_provider_auth.py
deleted file mode 100644
index 5aa2036..0000000
--- a/tests/unit/test_docker_provision_provider_auth.py
+++ /dev/null
@@ -1,173 +0,0 @@
-"""Unit: docker provider auth marker provisioning."""
-
-from __future__ import annotations
-
-import unittest
-from pathlib import Path
-from unittest.mock import MagicMock
-
-from bot_bottle.agent_provider import (
-    AgentProvisionDir,
-    AgentProvisionFile,
-    AgentProvisionPlan,
-)
-from bot_bottle.backend import Bottle, BottleSpec, ExecResult
-from bot_bottle.backend.docker.bottle_plan import DockerBottlePlan
-from bot_bottle.backend.docker.provision import provider_auth as _provider_auth
-from bot_bottle.egress import EgressPlan
-from bot_bottle.git_gate import GitGatePlan
-from bot_bottle.manifest import Manifest
-from bot_bottle.pipelock import PipelockProxyPlan
-from bot_bottle.workspace import workspace_plan
-
-
-def _plan(
-    *,
-    codex_auth_file: Path | None = None,
-    agent_provider_template: str = "codex",
-) -> DockerBottlePlan:
-    manifest = Manifest.from_json_obj({
-        "bottles": {"dev": {"agent_provider": {"template": "codex"}}},
-        "agents": {"demo": {"skills": [], "prompt": "", "bottle": "dev"}},
-    })
-    spec = BottleSpec(
-        manifest=manifest,
-        agent_name="demo",
-        copy_cwd=False,
-        user_cwd="/tmp/x",
-    )
-    return DockerBottlePlan(
-        spec=spec,
-        stage_dir=Path("/tmp/stage"),
-        slug="demo-abc12",
-        container_name="bot-bottle-demo-abc12",
-        container_name_pinned=False,
-        image="bot-bottle-codex:latest",
-        derived_image="",
-        runtime_image="bot-bottle-codex:latest",
-        dockerfile_path="",
-        env_file=Path("/tmp/agent.env"),
-        forwarded_env={},
-        prompt_file=Path("/tmp/prompt.txt"),
-        proxy_plan=PipelockProxyPlan(
-            yaml_path=Path("/tmp/pipelock.yaml"),
-            slug="demo-abc12",
-        ),
-        git_gate_plan=GitGatePlan(
-            slug="demo-abc12",
-            entrypoint_script=Path("/tmp/git-gate-entrypoint.sh"),
-            hook_script=Path("/tmp/git-gate-hook"),
-            access_hook_script=Path("/tmp/git-gate-access-hook"),
-            upstreams=(),
-        ),
-        egress_plan=EgressPlan(
-            slug="demo-abc12",
-            routes_path=Path("/tmp/routes.yaml"),
-            routes=(),
-            token_env_map={},
-        ),
-        supervise_plan=None,
-        use_runsc=False,
-        agent_provision=_agent_provision(
-            agent_provider_template, codex_auth_file=codex_auth_file,
-        ),
-        workspace_plan=workspace_plan(spec, guest_home="/home/node"),
-    )
-
-
-def _agent_provision(
-    template: str, *, codex_auth_file: Path | None = None,
-) -> AgentProvisionPlan:
-    if template != "codex":
-        return AgentProvisionPlan(
-            template=template,
-            command=template,
-            prompt_mode="append_file",
-            image="",
-            dockerfile="",
-            guest_env={},
-        )
-    files = [
-        AgentProvisionFile(
-            Path("/tmp/codex-config.toml"),
-            "/home/node/.codex/config.toml",
-        ),
-    ]
-    if codex_auth_file is not None:
-        files.append(AgentProvisionFile(
-            codex_auth_file,
-            "/home/node/.codex/auth.json",
-        ))
-    return AgentProvisionPlan(
-        template="codex",
-        command="codex",
-        prompt_mode="read_prompt_file",
-        image="bot-bottle-codex:latest",
-        dockerfile="",
-        guest_env={},
-        dirs=(AgentProvisionDir("/home/node/.codex"),),
-        files=tuple(files),
-    )
-
-
-def _make_bottle(name: str = "bot-bottle-demo-abc12") -> MagicMock:
-    bottle = MagicMock(spec=Bottle)
-    bottle.name = name
-    bottle.exec.return_value = ExecResult(returncode=0, stdout="", stderr="")
-    return bottle
-
-
-class TestProvisionProviderAuth(unittest.TestCase):
-    def test_noop_for_non_codex_provider(self):
-        bottle = _make_bottle()
-        _provider_auth.provision_provider_auth(
-            _plan(agent_provider_template="claude"), bottle,
-        )
-        self.assertEqual(0, bottle.cp_in.call_count)
-        self.assertEqual(0, bottle.exec.call_count)
-
-    def test_codex_provider_trusts_launch_dir_without_auth_file(self):
-        bottle = _make_bottle()
-        _provider_auth.provision_provider_auth(_plan(), bottle)
-        scripts = [c.args[0] for c in bottle.exec.call_args_list]
-        self.assertTrue(
-            any("mkdir -p" in s and "/home/node/.codex" in s for s in scripts)
-        )
-        cp_calls = [c.args for c in bottle.cp_in.call_args_list]
-        self.assertIn(
-            ("/tmp/codex-config.toml", "/home/node/.codex/config.toml"),
-            cp_calls,
-        )
-        self.assertTrue(
-            any("chown" in s and "/home/node/.codex/config.toml" in s for s in scripts)
-        )
-        self.assertTrue(
-            any("chmod" in s and "/home/node/.codex/config.toml" in s for s in scripts)
-        )
-
-    def test_copies_dummy_auth_json_to_codex_home(self):
-        bottle = _make_bottle()
-        _provider_auth.provision_provider_auth(
-            _plan(codex_auth_file=Path("/tmp/codex-auth.json")),
-            bottle,
-        )
-        cp_calls = [c.args for c in bottle.cp_in.call_args_list]
-        self.assertIn(
-            ("/tmp/codex-config.toml", "/home/node/.codex/config.toml"),
-            cp_calls,
-        )
-        self.assertIn(
-            ("/tmp/codex-auth.json", "/home/node/.codex/auth.json"),
-            cp_calls,
-        )
-        scripts = [c.args[0] for c in bottle.exec.call_args_list]
-        self.assertTrue(
-            any("chown" in s and "/home/node/.codex/auth.json" in s for s in scripts)
-        )
-        self.assertTrue(
-            any("chmod" in s and "/home/node/.codex/auth.json" in s for s in scripts)
-        )
-
-
-if __name__ == "__main__":
-    unittest.main()
diff --git a/tests/unit/test_plan_print_parity.py b/tests/unit/test_plan_print_parity.py
index 91a0afd..10328f4 100644
--- a/tests/unit/test_plan_print_parity.py
+++ b/tests/unit/test_plan_print_parity.py
@@ -103,6 +103,7 @@ def _proxy_plan(tmp: str) -> PipelockProxyPlan:
 def _docker_plan(spec: BottleSpec, tmp: str) -> DockerBottlePlan:
     stage = Path(tmp)
     return DockerBottlePlan(
+        guest_home="/home/node",
         spec=spec,
         stage_dir=stage,
         git_gate_plan=_git_gate_plan(tmp),
@@ -128,6 +129,7 @@ def _docker_plan(spec: BottleSpec, tmp: str) -> DockerBottlePlan:
 def _smolmachines_plan(spec: BottleSpec, tmp: str) -> SmolmachinesBottlePlan:
     stage = Path(tmp)
     return SmolmachinesBottlePlan(
+        guest_home="/home/node",
         spec=spec,
         stage_dir=stage,
         git_gate_plan=_git_gate_plan(tmp),
diff --git a/tests/unit/test_provision_supervise.py b/tests/unit/test_provision_supervise.py
deleted file mode 100644
index da7e2b1..0000000
--- a/tests/unit/test_provision_supervise.py
+++ /dev/null
@@ -1,30 +0,0 @@
-"""Unit: supervise MCP provisioning (PRD 0013 follow-up).
-
-The real provisioning runs `claude mcp add` inside the agent
-container — exercised by the existing supervise integration test
-chain once the agent container is brought up. Here we just cover
-the URL computation so a regression in SUPERVISE_HOSTNAME / PORT
-plumbing surfaces in unit CI."""
-
-import unittest
-
-from bot_bottle.backend.docker.provision.supervise import supervise_mcp_url
-from bot_bottle.supervise import SUPERVISE_HOSTNAME, SUPERVISE_PORT
-
-
-class TestSuperviseMcpUrl(unittest.TestCase):
-    def test_url_matches_sidecar_constants(self):
-        self.assertEqual(
-            f"http://{SUPERVISE_HOSTNAME}:{SUPERVISE_PORT}/",
-            supervise_mcp_url(),
-        )
-
-    def test_url_is_http_not_https(self):
-        # The agent dials the sidecar on the internal docker network;
-        # no TLS termination, no CA trust juggling. If this ever
-        # needs HTTPS, the sidecar's listener side has to change too.
-        self.assertTrue(supervise_mcp_url().startswith("http://"))
-
-
-if __name__ == "__main__":
-    unittest.main()
diff --git a/tests/unit/test_smolmachines_provision.py b/tests/unit/test_smolmachines_provision.py
index 1ad4eef..c48aa01 100644
--- a/tests/unit/test_smolmachines_provision.py
+++ b/tests/unit/test_smolmachines_provision.py
@@ -26,10 +26,6 @@ from bot_bottle.backend.smolmachines.bottle_plan import (
 from bot_bottle.backend.smolmachines.provision import (
     ca as _ca,
     git as _git,
-    prompt as _prompt,
-    provider_auth as _provider_auth,
-    skills as _skills,
-    supervise as _supervise,
     workspace as _workspace,
 )
 from bot_bottle.backend.smolmachines.launch import _bundle_launch_spec
@@ -124,6 +120,7 @@ def _plan(
             current_config_dir=Path("/tmp/current-config"),
         )
     return SmolmachinesBottlePlan(
+        guest_home="/home/node",
         spec=spec,
         stage_dir=stage_dir or Path("/tmp/stage"),
         slug="demo-abc12",
@@ -223,257 +220,6 @@ def _agent_provision(
     )
 
 
-class TestProvisionPrompt(unittest.TestCase):
-    def test_cp_uses_bottle_cp_in(self):
-        bottle = _make_bottle()
-        _prompt.provision_prompt(_plan(), bottle)
-        bottle.cp_in.assert_called_once_with(
-            "/tmp/state/demo-abc12/agent/prompt.txt",
-            "/home/node/.bot-bottle-prompt.txt",
-        )
-
-    def test_returns_path_when_agent_has_prompt(self):
-        bottle = _make_bottle()
-        r = _prompt.provision_prompt(
-            _plan(agent_prompt="You are a helpful assistant."),
-            bottle,
-        )
-        self.assertEqual("/home/node/.bot-bottle-prompt.txt", r)
-
-    def test_returns_none_when_agent_has_no_prompt(self):
-        # The file is still copied (path-must-exist contract);
-        # only the return value differs.
-        bottle = _make_bottle()
-        r = _prompt.provision_prompt(_plan(agent_prompt=""), bottle)
-        self.assertIsNone(r)
-        bottle.cp_in.assert_called_once()
-
-    def test_chowns_to_node_after_copy(self):
-        # cp_in lands as root; without the chown, the node user
-        # can't read its own mode-600 prompt.
-        bottle = _make_bottle()
-        _prompt.provision_prompt(_plan(), bottle)
-        scripts = _exec_scripts(bottle)
-        self.assertTrue(
-            any("chown node:node" in s and "/home/node/.bot-bottle-prompt.txt" in s
-                for s in scripts)
-        )
-        self.assertTrue(
-            any("chmod 600" in s and "/home/node/.bot-bottle-prompt.txt" in s
-                for s in scripts)
-        )
-
-
-class TestProvisionProviderAuth(unittest.TestCase):
-    def test_noop_for_non_codex_provider(self):
-        bottle = _make_bottle()
-        _provider_auth.provision_provider_auth(_plan(), bottle)
-        self.assertEqual(0, bottle.cp_in.call_count)
-        self.assertEqual(0, bottle.exec.call_count)
-
-    def test_codex_provider_trusts_launch_dir_without_auth_file(self):
-        bottle = _make_bottle()
-        _provider_auth.provision_provider_auth(
-            _plan(agent_provider_template="codex"),
-            bottle,
-        )
-        bottle.cp_in.assert_called_once_with(
-            "/tmp/codex-config.toml",
-            "/home/node/.codex/config.toml",
-        )
-        scripts = _exec_scripts(bottle)
-        self.assertTrue(any("mkdir -p" in s and "/home/node/.codex" in s for s in scripts))
-        self.assertTrue(
-            any("chown" in s and "node:node" in s and "/home/node/.codex/config.toml" in s
-                for s in scripts)
-        )
-        self.assertTrue(
-            any("chmod" in s and "600" in s and "/home/node/.codex/config.toml" in s
-                for s in scripts)
-        )
-
-    def test_copies_dummy_auth_json_to_codex_home(self):
-        bottle = _make_bottle()
-        _provider_auth.provision_provider_auth(
-            _plan(
-                agent_provider_template="codex",
-                codex_auth_file=Path("/tmp/codex-auth.json"),
-            ),
-            bottle,
-        )
-        cp_calls = [c.args for c in bottle.cp_in.call_args_list]
-        self.assertIn(
-            ("/tmp/codex-config.toml", "/home/node/.codex/config.toml"),
-            cp_calls,
-        )
-        self.assertIn(
-            ("/tmp/codex-auth.json", "/home/node/.codex/auth.json"),
-            cp_calls,
-        )
-        scripts = _exec_scripts(bottle)
-        self.assertTrue(any("mkdir -p" in s and "/home/node/.codex" in s for s in scripts))
-        self.assertTrue(
-            any("chown" in s and "node:node" in s and s.rstrip().endswith("/home/node/.codex")
-                for s in scripts)
-        )
-        self.assertTrue(
-            any("chmod" in s and "700" in s and s.rstrip().endswith("/home/node/.codex")
-                for s in scripts)
-        )
-        # The pre_copy `find ... -delete` script should be present
-        # (shlex.join properly quotes the `(`/`)`/`*.sqlite`).
-        self.assertTrue(
-            any("find" in s and "-delete" in s and "*.sqlite" in s for s in scripts)
-        )
-        self.assertTrue(
-            any("chown" in s and "/home/node/.codex/auth.json" in s for s in scripts)
-        )
-        self.assertTrue(
-            any("chmod" in s and "600" in s and "/home/node/.codex/auth.json" in s
-                for s in scripts)
-        )
-        # Verify command runs `codex login status` via runuser node.
-        self.assertTrue(
-            any("runuser" in s and "codex login status" in s for s in scripts)
-        )
-
-    def test_honors_codex_home_from_guest_env(self):
-        bottle = _make_bottle()
-        _provider_auth.provision_provider_auth(
-            _plan(
-                agent_provider_template="codex",
-                codex_auth_file=Path("/tmp/codex-auth.json"),
-                guest_env={"CODEX_HOME": "/run/codex-home"},
-            ),
-            bottle,
-        )
-        cp_calls = [c.args for c in bottle.cp_in.call_args_list]
-        self.assertIn(
-            ("/tmp/codex-config.toml", "/run/codex-home/config.toml"),
-            cp_calls,
-        )
-        self.assertIn(
-            ("/tmp/codex-auth.json", "/run/codex-home/auth.json"),
-            cp_calls,
-        )
-        scripts = _exec_scripts(bottle)
-        self.assertTrue(
-            any("runuser" in s and "CODEX_HOME=/run/codex-home" in s and "codex login status" in s
-                for s in scripts)
-        )
-
-    def test_dies_when_codex_home_cannot_be_created(self):
-        bottle = _make_bottle(
-            exec_result=ExecResult(1, "", "mkdir: nope\n"),
-        )
-        with self.assertRaises(SystemExit):
-            _provider_auth.provision_provider_auth(
-                _plan(
-                    agent_provider_template="codex",
-                    codex_auth_file=Path("/tmp/codex-auth.json"),
-                ),
-                bottle,
-            )
-        self.assertEqual(0, bottle.cp_in.call_count)
-        self.assertEqual(1, bottle.exec.call_count)
-
-    def test_dies_when_codex_rejects_dummy_auth(self):
-        # CODEX_HOME setup ok, but codex login status fails (last exec).
-        bottle = _make_bottle()
-        bottle.exec.side_effect = [
-            ExecResult(0, "", ""),  # mkdir CODEX_HOME
-            ExecResult(0, "", ""),  # chown CODEX_HOME
-            ExecResult(0, "", ""),  # chmod CODEX_HOME
-            ExecResult(0, "", ""),  # find ... -delete (pre_copy)
-            ExecResult(0, "", ""),  # chown config.toml
-            ExecResult(0, "", ""),  # chmod config.toml
-            ExecResult(0, "", ""),  # chown auth.json
-            ExecResult(0, "", ""),  # chmod auth.json
-            ExecResult(1, "Not logged in\n", ""),  # login status (verify)
-        ]
-        with self.assertRaises(SystemExit):
-            _provider_auth.provision_provider_auth(
-                _plan(
-                    agent_provider_template="codex",
-                    codex_auth_file=Path("/tmp/codex-auth.json"),
-                ),
-                bottle,
-            )
-
-
-class TestProvisionSkills(unittest.TestCase):
-    def _patch_host_skill_dir(self, returns: dict[str, str]):
-        return patch(
-            "bot_bottle.backend.smolmachines.provision.skills.host_skill_dir",
-            side_effect=lambda n: returns.get(n, f"/nope/{n}"),
-        )
-
-    def test_no_op_when_agent_has_no_skills(self):
-        bottle = _make_bottle()
-        _skills.provision_skills(_plan(skills=[]), bottle)
-        self.assertEqual(0, bottle.cp_in.call_count)
-        self.assertEqual(0, bottle.exec.call_count)
-
-    def test_mkdir_plus_cp_per_skill(self):
-        bottle = _make_bottle()
-        with self._patch_host_skill_dir({
-            "init-prd": "/host/skills/init-prd",
-            "verify": "/host/skills/verify",
-        }), patch(
-            "bot_bottle.backend.smolmachines.provision.skills.os.path.isdir",
-            return_value=True,
-        ):
-            _skills.provision_skills(
-                _plan(skills=["init-prd", "verify"]),
-                bottle,
-            )
-
-        # mkdir skills_dir once + (rm -rf + chown) per skill = 5 exec calls.
-        self.assertEqual(5, bottle.exec.call_count)
-        scripts = _exec_scripts(bottle)
-        self.assertTrue(
-            any("mkdir -p" in s and "/home/node/.claude/skills" in s for s in scripts)
-        )
-        # Two cp calls, one per skill, into the per-skill subdir.
-        self.assertEqual(2, bottle.cp_in.call_count)
-        cp_targets = {call.args[1] for call in bottle.cp_in.call_args_list}
-        self.assertEqual(
-            {
-                "/home/node/.claude/skills/init-prd",
-                "/home/node/.claude/skills/verify",
-            },
-            cp_targets,
-        )
-        # Each skill gets a chown -R node:node so claude can read it.
-        chown_scripts = [s for s in scripts if "chown -R node:node" in s]
-        self.assertEqual(2, len(chown_scripts))
-
-    def test_skills_dir_overridable_via_env(self):
-        import os
-        bottle = _make_bottle()
-        with self._patch_host_skill_dir({"init-prd": "/host/skills/init-prd"}), \
-             patch(
-                 "bot_bottle.backend.smolmachines.provision.skills.os.path.isdir",
-                 return_value=True,
-             ), \
-             patch.dict(os.environ, {"BOT_BOTTLE_GUEST_SKILLS_DIR": "/home/node/.claude/skills"}):
-            _skills.provision_skills(_plan(skills=["init-prd"]), bottle)
-        self.assertEqual(
-            "/home/node/.claude/skills/init-prd",
-            bottle.cp_in.call_args.args[1],
-        )
-
-    def test_missing_skill_dies(self):
-        bottle = _make_bottle()
-        with self._patch_host_skill_dir({"init-prd": "/host/skills/init-prd"}), \
-             patch(
-                 "bot_bottle.backend.smolmachines.provision.skills.os.path.isdir",
-                 return_value=False,
-             ):
-            with self.assertRaises(SystemExit):
-                _skills.provision_skills(_plan(skills=["init-prd"]), bottle)
-
-
 def _write_self_signed_cert(path: Path) -> None:
     """Drop a real self-signed PEM at `path` so provision_ca's
     fingerprint computation (PEM_cert_to_DER_cert + sha256) has
@@ -774,41 +520,5 @@ class TestProvisionWorkspace(unittest.TestCase):
         )
 
 
-class TestProvisionSupervise(unittest.TestCase):
-    def test_noop_when_supervise_not_enabled(self):
-        bottle = _make_bottle()
-        _supervise.provision_supervise(_plan(), bottle)
-        bottle.exec.assert_not_called()
-
-    def test_calls_claude_mcp_add_when_supervise_enabled(self):
-        plan = _plan(
-            supervise=True,
-            agent_supervise_url="http://127.0.0.1:9100/",
-        )
-        bottle = _make_bottle()
-        _supervise.provision_supervise(plan, bottle)
-        bottle.exec.assert_called_once()
-        script = bottle.exec.call_args.args[0]
-        user = bottle.exec.call_args.kwargs.get("user")
-        self.assertEqual("node", user)
-        # SmolmachinesBottle.exec(user="node") handles uid switch +
-        # HOME setup automatically — the script itself is just the
-        # claude command.
-        self.assertIn("claude mcp add", script)
-        self.assertIn("--scope user", script)
-        self.assertIn("--transport http", script)
-        self.assertIn("supervise", script)
-        self.assertIn("http://127.0.0.1:9100/", script)
-
-    def test_non_zero_exit_logs_warning_but_does_not_raise(self):
-        plan = _plan(supervise=True)
-        bottle = _make_bottle(
-            exec_result=ExecResult(returncode=1, stdout="", stderr="boom"),
-        )
-        # No raise — the bottle still works without the MCP
-        # entry, so we log and move on.
-        _supervise.provision_supervise(plan, bottle)
-
-
 if __name__ == "__main__":
     unittest.main()