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+# MCP Status Panel — Design
+
+Date: 2026-08-03
+Status: Approved
+
+## Problem
+
+`app/mcp/` already exposes the compliance knowledge base over MCP
+(`search_regulations`, Streamable HTTP at `/mcp/`, JWT-guarded, Host
+allow-listed). It is completely invisible from the product: an operator
+looking at the System Status page cannot tell whether the MCP endpoint is
+enabled, what URL a client should point at, which tools are advertised, or
+whether anything has ever called it.
+
+This design adds that visibility, and only that.
+
+## Goals
+
+- Show MCP endpoint configuration (public URL, auth on/off, Host allow-list).
+- Show the advertised tool list, read from the live MCP registry rather than
+  hard-coded.
+- Show per-tool call counters: total calls, errors, average duration, last
+  call time.
+- Give the operator a one-click "copy client config" JSON they can paste into
+  Claude Desktop / Cursor.
+
+## Non-Goals
+
+- No persistence. Counters are in-memory and reset on restart. Token
+  consumption caused by MCP calls is already persisted by the existing
+  `ModelUsageTracker` (MCP calls route through `AgentConversationService.ask()`
+  like every other caller), so nothing billable is lost.
+- No historical trends or time-series charts.
+- No active-client / session list. That would require hooking the MCP SDK's
+  internal `StreamableHTTPSessionManager`, which is private API and breaks on
+  SDK upgrades.
+- No per-client attribution.
+- No new frontend test framework — the project has none, and this change does
+  not justify introducing one.
+
+## Architecture
+
+Module boundary is unchanged: everything new on the backend lands inside the
+existing `app/mcp/` module, plus one thin HTTP adapter route.
+
+```
+frontend/src/pages/Status/StatusPage.tsx
+        │  GET /api/v1/status/mcp
+        ▼
+backend/app/api/routes/status.py        ← HTTP adapter only
+        │  get_mcp_status(public_url)
+        ▼
+backend/app/mcp/server.py               ← assembles the status payload
+        ├── settings (endpoint / auth / allowed hosts)
+        ├── mcp.list_tools()            ← live tool registry
+        └── app/mcp/stats.py            ← in-memory counters
+```
+
+The status route must not reach into the MCP server's internals. It passes in
+the resolved public URL (the one thing only the HTTP layer knows) and receives
+a finished dict. This keeps the MCP protocol details in one module.
+
+## Components
+
+### `app/mcp/stats.py` (new)
+
+Mirrors `app/shared/model_usage_tracker.py` in shape and in defensive posture.
+
+- `MCPToolStats` dataclass: `calls`, `errors`, `last_called_at`,
+  `total_duration_ms`; `avg_duration_ms` computed as a property.
+- `MCPStatsTracker`: one `threading.Lock` guarding a
+  `dict[str, MCPToolStats]`. `record(tool, duration_ms, success)` and
+  `snapshot()`.
+- `get_mcp_stats_tracker()`, `@lru_cache` singleton.
+
+The lock is not optional. The mcp SDK (2.0.0) dispatches synchronous tool
+functions via `anyio.to_thread.run_sync`, so `search_regulations` genuinely
+runs on multiple worker threads concurrently — unlike the async REST routes,
+which serialize on the event loop.
+
+`record()` swallows and logs its own exceptions, matching `ModelUsageTracker`:
+a defect in observability code must never fail a real MCP tool call.
+
+### `app/mcp/server.py` (modified)
+
+- `search_regulations` gets a `try/except/finally` wrapper that measures
+  elapsed time with `time.perf_counter()` and records success or failure. The
+  exception is re-raised after recording — the MCP SDK still needs to turn it
+  into a protocol-level error.
+- New `async def get_mcp_status(public_url: str) -> dict` merges three
+  sources: settings, `await mcp.list_tools()`, and the stats snapshot. Tools
+  are matched to their stats by name; a tool that has never been called
+  reports zeros.
+
+### `app/api/routes/status.py` (modified)
+
+`GET /status/mcp` resolves the public URL, then delegates:
+
+```python
+public_url = settings.mcp_public_url or f"{str(request.base_url).rstrip('/')}/mcp/"
+return await get_mcp_status(public_url)
+```
+
+### `app/config/settings.py` + `.env.example` (modified)
+
+New optional `mcp_public_url: str = ""`.
+
+This override is required, not cosmetic. The Vite dev proxy sets
+`changeOrigin: true` (`frontend/vite.config.ts`), which rewrites the `Host`
+header to the proxy target, so `request.base_url` on the backend reads
+`http://127.0.0.1:8000/` in development regardless of how the operator
+actually reached the page. Deployments behind a reverse proxy that does not
+forward the original Host have the same problem. When unset, the derived
+value is correct for the common same-origin case.
+
+### Frontend
+
+- `api/index.ts`: `MCPToolEntry` and `MCPStatusResponse` types, alongside the
+  existing `ModelUsageEntry` / `SystemHealth` types.
+- `api/status.ts`: `getMCPStatus()`, using the typed `fetchAPI` client.
+- `StatusPage.tsx`: new "MCP Server" card in the left column, directly below
+  the existing "AI Models" card. It joins the existing
+  `Promise.allSettled([...])` batch, so it refreshes with the page's existing
+  Refresh button and needs no independent polling. `handleExport()` includes
+  the MCP payload.
+  - Header row: title + "copy client config" button.
+  - Endpoint row: `StatusIcon` + monospace URL + auth badge + Host allow-list.
+  - One row per tool: name, calls, errors, average duration, last call time.
+  - Reuses the existing `card`, `card-header`, `service-row` classes and the
+    `StatusIcon` component. No new CSS.
+- `locales/zh.ts` / `locales/en.ts`: new keys under the existing `status`
+  section.
+
+### Copy client config
+
+Produces the Streamable HTTP form both Claude Desktop and Cursor accept:
+
+```json
+{
+  "mcpServers": {
+    "ai-regulations": {
+      "url": "http://6.86.80.9:8000/mcp/",
+      "headers": { "Authorization": "Bearer <token>" }
+    }
+  }
+}
+```
+
+The real JWT from `localStorage` is embedded, because a config with a
+placeholder does not work when pasted and defeats the button's purpose. This
+is the operator's own token, already present in their own browser; the button
+moves it from one local store to another local store on the same machine. The
+`headers` key is omitted entirely when `auth_required` is false.
+
+## Data Flow
+
+1. StatusPage mounts (or Refresh is pressed) → `getMCPStatus()` in the
+   existing parallel batch.
+2. Route resolves the public URL and calls `get_mcp_status()`.
+3. `get_mcp_status()` reads settings, awaits `mcp.list_tools()`, snapshots
+   stats, joins tools to stats by name.
+4. Card renders. Counters advance only when a real MCP client calls a tool.
+
+## Error Handling
+
+- `GET /status/mcp` fails or times out → `Promise.allSettled` leaves the state
+  `null` → card renders a muted "unavailable" body. This is the same pattern
+  the existing model-usage card already uses; one failing status endpoint must
+  never blank the whole page.
+- `mcp.list_tools()` reads an in-memory registry populated at import time and
+  has no failure mode worth special-casing; an unexpected exception surfaces
+  as a 500 on this one endpoint and is contained by the point above.
+- `MCPStatsTracker.record()` never raises (logged and swallowed).
+- `navigator.clipboard.writeText` rejects on insecure origins and when
+  permission is denied. The button reports failure in its own label rather
+  than throwing — a silent no-op would leave the operator believing they
+  copied something.
+
+## Testing
+
+`backend/tests/mcp/test_mcp_stats.py`:
+
+- Concurrent `record()` from multiple threads yields an exact total (proves
+  the lock).
+- `avg_duration_ms` is correct across several calls, and is `None` with zero
+  calls (no division by zero).
+- Successes and failures land in `calls` vs `errors` correctly.
+- `record()` on malformed input logs instead of raising.
+
+`backend/tests/mcp/test_mcp_status.py`:
+
+- `get_mcp_status()` returns the advertised tool with zeroed stats before any
+  call, and reflects recorded stats after.
+- `auth_required` follows `settings.auth_enabled`.
+- The passed-in `public_url` appears unmodified in the payload.
+
+Frontend: no new tests; verified via `npm --prefix frontend run lint` and
+`npm --prefix frontend run build`.