Default agent-provider routes to the redact on-match policy

Provider routes (the agent talking to its own LLM API — api.anthropic.com,
the Codex backend, etc.) carry the whole conversation payload, which is the
worst source of token-shaped false positives. egress_routes_for_bottle now
fills outbound_on_match=redact on any provider route that doesn't set it
explicitly, so a match there is scrubbed and forwarded rather than blocked
or queued for the operator. A provider that sets the policy keeps its
choice; manifest routes still default to supervise.

Tests: provider route gets redact default, explicit provider policy
preserved, manifest route unaffected. README + PRD 0062 updated.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01HnvBjPZC5V7qeQpFbQdDmS

README.md

@@ -149,7 +149,7 @@ You help maintain Gitea-hosted projects.
 | `dlp` | no | Per-route DLP overrides. Omit to use defaults (all detectors on). |
 | `dlp.outbound_detectors` | no | `false` disables outbound scanning; list restricts to named detectors (`token_patterns`, `known_secrets`). |
 | `dlp.inbound_detectors` | no | `false` disables inbound scanning; list restricts to named detectors (`naive_injection_detection`). |
-| `dlp.outbound_on_match` | no | What to do when an outbound token is detected: `supervise` (default — hold for operator approval), `redact` (scrub the value and forward), or `block` (hard 403). |
+| `dlp.outbound_on_match` | no | What to do when an outbound token is detected: `supervise` (default for manifest routes — hold for operator approval), `redact` (scrub the value and forward), or `block` (hard 403). Agent-provider routes (e.g. `api.anthropic.com`) default to `redact`. |
 | `git.fetch` | no | `true` permits smart HTTP clone/fetch (`git-upload-pack`) for this host. Push (`git-receive-pack`) remains blocked. |
 
 When an outbound DLP detector matches a token, the route's `dlp.outbound_on_match` policy decides what happens. Under the default `supervise`, the proxy queues an `egress-token-allow` proposal for the operator's `./cli.py supervise` TUI and holds the request open until it is answered (or `EGRESS_TOKEN_ALLOW_TIMEOUT_SECONDS`, default 300s, elapses — after which it fails closed). The operator never sees the raw token, only the host, method, path, and a redacted snippet; approving adds the value to an in-memory safelist for the life of the egress proxy. Under `redact`, the matched value is scrubbed from the body, headers, and path and the request is forwarded (failing closed if a match lands somewhere unredactable, like the hostname). Under `block` it stays a hard `403`. Structural blocks (CRLF injection) and not-in-allowlist host blocks are always hard `403`s regardless of policy.

bot_bottle/egress.py

@@ -16,6 +16,7 @@ from pathlib import Path
 from typing import TYPE_CHECKING
 
 from .egress_addon_core import (
+    ON_MATCH_REDACT,
     HeaderMatch as CoreHeaderMatch,
     MatchEntry as CoreMatchEntry,
     PathMatch as CorePathMatch,
@@ -106,12 +107,27 @@ def egress_routes_for_bottle(
 ) -> tuple[EgressRoute, ...]:
     manifest = egress_manifest_routes(bottle)
     provisioned_hosts = {pr.host.lower() for pr in provider_routes}
-    merged = list(provider_routes) + [
+    merged = list(_default_provider_on_match(provider_routes)) + [
         r for r in manifest if r.host.lower() not in provisioned_hosts
     ]
     return _assign_token_slots(merged)
 
 
+def _default_provider_on_match(
+    provider_routes: tuple[EgressRoute, ...],
+) -> tuple[EgressRoute, ...]:
+    """Provider routes (the agent talking to its own LLM API) default to the
+    `redact` on-match policy (PRD 0062): high-volume conversation payloads are
+    the worst source of token-shaped false positives, so a match is scrubbed
+    and forwarded rather than hard-blocked or queued for the operator. A
+    provider that sets `outbound_on_match` explicitly keeps its choice."""
+    return tuple(
+        r if r.outbound_on_match
+        else dataclasses.replace(r, outbound_on_match=ON_MATCH_REDACT)
+        for r in provider_routes
+    )
+
+
 def _assign_token_slots(
     routes: list[EgressRoute],
 ) -> tuple[EgressRoute, ...]:

docs/prds/0062-egress-supervisor-token-override.md

@@ -87,6 +87,15 @@ rendered `routes.yaml` (`egress_render_routes`), and the addon's `Route`
 request time. The `list-egress-routes` introspection endpoint round-trips it so
 the agent's proposals preserve it.
 
+**Provider routes default to `redact`.** Agent-provider routes (the agent
+talking to its own LLM API — `api.anthropic.com`, the Codex backend, etc.) are
+the worst source of token-shaped false positives because the whole
+conversation payload flows through them. `egress_routes_for_bottle` fills
+`outbound_on_match=redact` on any provider route that doesn't set it
+explicitly, so a match there is scrubbed and forwarded rather than blocked or
+queued. A provider that sets the policy keeps its choice; manifest routes are
+unaffected (they default to `supervise`).
+
 On an outbound block the addon dispatches on the resolved policy:
 
 - **Structural blocks always 403.** A `ScanResult` with no `matched` value

tests/unit/test_egress.py

@@ -202,6 +202,23 @@ class TestProviderRouteMerge(unittest.TestCase):
         self.assertEqual((), routes[0].matches)
         self.assertEqual({}, egress_token_env_map(routes))
 
+    def test_provider_route_defaults_to_redact_on_match(self):
+        b = _bottle([])
+        pr = EgressRoute(host="api.anthropic.com")
+        routes = egress_routes_for_bottle(b, (pr,))
+        self.assertEqual("redact", routes[0].outbound_on_match)
+
+    def test_provider_route_explicit_on_match_preserved(self):
+        b = _bottle([])
+        pr = EgressRoute(host="api.anthropic.com", outbound_on_match="supervise")
+        routes = egress_routes_for_bottle(b, (pr,))
+        self.assertEqual("supervise", routes[0].outbound_on_match)
+
+    def test_manifest_route_does_not_get_redact_default(self):
+        b = _bottle([{"host": "api.example.com"}])
+        routes = egress_routes_for_bottle(b)
+        self.assertEqual("", routes[0].outbound_on_match)
+
     def test_two_provider_routes_with_same_token_ref_share_slot(self):
         b = _bottle([])
         routes = egress_routes_for_bottle(b, (