fix(mcp): detect and reject manually launched duplicate MCP role servers (Closes #686)

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2026-07-25 19:25:23 -04:00
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9 changed files with 345 additions and 14 deletions
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@@ -153,7 +153,19 @@ not a tool argument: a session must never be able to authorize itself.
## Related
- #630 — manual daemon killing as contaminated recovery (this contrast, enforced).
- #657 — restart-path inventory and daemon classification.
- #686 — manual server launch detection & fail-closed provenance gate.
- #531 / #544 — stale-runtime detection (`ps`-based); sibling failure mode.
- #558 / `docs/mcp-daemon-import-guard.md` — why shell imports are not a repair.
- `docs/mcp-client-registration.md` — per-server registration contract.
- `docs/mcp-namespace-health.md` — probe sources and mutation enforcement.
## Sanctioned reconnect vs forbidden manual launch (#686)
In addition to manual process killing (#630), manually launching a duplicate role server from an ad hoc shell (`python3 mcp_server.py`) is forbidden and fail-closed:
- **Why manual launches are unsupported:** A terminal-launched `mcp_server.py` holds its own stdio transport; it can never bind to the IDE client's stdio pipes. It cannot restore a dropped IDE namespace, and a manual duplicate process masks stale client-managed runtimes for that profile, defeating stale-runtime gates.
- **Sanctioned path:** Supported recovery is IDE/client-managed reconnect only (`/mcp reconnect`, IDE restart, or sanctioned reconnect exposure).
- **Fail-closed enforcement (#686):** Mutating tools on a server lacking client-managed launch provenance (`GITEA_CLIENT_MANAGED=1`) refuse execution fail-closed with typed blocker `unsupported_manual_launch` and an exact next action. Unsupported `GITEA_*` env overrides (e.g. `GITEA_DUMMY`) are surfaced in diagnostics rather than silently ignored.
- **Inventory & staleness:** Staleness diagnostics ignore non-client-managed duplicates when evaluating runtime freshness and inventory duplicate processes per profile (#657, #686).