feat: surface MCP server status in System Status page

Add per-tool in-memory call counters to the MCP module and a
GET /api/v1/status/mcp endpoint that joins them with the live tool
registry and endpoint config, then render it as a new card on the
System Status page with a one-click client-config copy button.

- app/mcp/stats.py: lock-guarded MCPStatsTracker (the mcp SDK runs sync
  tool bodies via anyio.to_thread.run_sync, so this is genuinely
  multi-threaded, unlike the async REST routes)
- app/mcp/server.py: instrument search_regulations, add get_mcp_status()
- app/config/settings.py: optional MCP_PUBLIC_URL override, required
  because the Vite proxy and reverse proxies rewrite the Host header
- StatusPage.tsx: MCP Server card, joins the existing parallel fetch

Counters are process-local by design; token usage is already persisted
by ModelUsageTracker since MCP calls route through ask().

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

.env.example

@@ -176,3 +176,9 @@ CORS_ALLOW_ORIGINS=http://localhost:5173
 # MCP_ALLOWED_HOSTS=6.86.80.9:*,127.0.0.1:*,localhost:*
 MCP_ALLOWED_HOSTS=127.0.0.1:*,localhost:*,[::1]:*
 
+# 系统状态页展示、以及"复制接入配置"按钮所使用的 MCP 外部访问地址。
+# 留空则由后端从请求的 Host 头推导；当前端经 Vite 代理（changeOrigin: true）
+# 或反向代理改写了 Host 时，推导结果会是 127.0.0.1，此时必须显式指定。
+# MCP_PUBLIC_URL=http://6.86.80.9:8000/mcp/
+MCP_PUBLIC_URL=
+

backend/app/api/routes/status.py

@@ -4,10 +4,11 @@ import asyncio
 import time
 from typing import Any
 
-from fastapi import APIRouter
+from fastapi import APIRouter, Request
 
 from app.config.settings import settings
 from app.domain.retrieval import RetrievedChunk
+from app.mcp.server import get_mcp_status
 from app.services.llm.llm_factory import get_llm_client, get_llm_factory
 from app.shared.bootstrap import (
     get_bm25_retriever,
@@ -280,3 +281,17 @@ async def ping_model_connections():
     ]
     await asyncio.gather(*tasks, return_exceptions=True)
     return {"models": [_build_model_status(role) for role in _MODEL_ROLES]}
+
+
+@router.get("/mcp")
+async def get_mcp_server_status(request: Request):
+    """Return MCP endpoint config, advertised tools, and per-tool call counters.
+
+    This route is a thin HTTP adapter: everything MCP-specific is assembled by
+    app.mcp.server.get_mcp_status(). The only thing decided here is the public
+    URL, because only the HTTP layer knows how the client reached us.
+    """
+    # request.base_url already carries scheme/host/port and a trailing slash;
+    # strip it before appending so the result is ".../mcp/", not ".../mcp//".
+    public_url = settings.mcp_public_url or f"{str(request.base_url).rstrip('/')}/mcp/"
+    return await get_mcp_status(public_url)

backend/app/config/settings.py

@@ -212,6 +212,18 @@ class Settings(BaseSettings):
         ),
     )
 
+    # Optional override for the URL shown on the System Status page and copied
+    # into client configs. Needed because request.base_url reflects the Host
+    # header, which the Vite dev proxy (changeOrigin: true) and reverse proxies
+    # that do not forward the original Host both rewrite.
+    mcp_public_url: str = Field(
+        default="",
+        description=(
+            "Externally reachable MCP endpoint URL, e.g. http://6.86.80.9:8000/mcp/. "
+            "Leave empty to derive it from the incoming request."
+        ),
+    )
+
 @lru_cache
 def get_settings() -> Settings:
     """Return settings."""

backend/app/mcp/server.py

@@ -9,6 +9,7 @@ dict. No new retrieval, ranking, or LLM orchestration logic lives here.
 from __future__ import annotations
 
 import logging
+import time
 from typing import Annotated
 
 from mcp.server import MCPServer
@@ -18,6 +19,7 @@ from starlette.responses import PlainTextResponse
 from starlette.types import ASGIApp, Receive, Scope, Send
 
 from app.config.settings import settings
+from app.mcp.stats import get_mcp_stats_tracker
 from app.shared.bootstrap import get_agent_conversation_service, get_jwt_handler
 
 logger = logging.getLogger(__name__)
@@ -50,7 +52,24 @@ def search_regulations(
     # No session_id is passed: this keeps each call stateless (no
     # ConversationStore reads/writes), matching "search" semantics rather
     # than multi-turn chat semantics.
-    _, result = get_agent_conversation_service().ask(query=query, top_k=top_k)
+    started = time.perf_counter()
+    try:
+        _, result = get_agent_conversation_service().ask(query=query, top_k=top_k)
+    except Exception:
+        # Record the failure, then re-raise unchanged so the MCP SDK still
+        # converts it into a protocol-level error for the client. Swallowing
+        # it here would report success to the caller.
+        get_mcp_stats_tracker().record(
+            tool="search_regulations",
+            duration_ms=(time.perf_counter() - started) * 1000,
+            success=False,
+        )
+        raise
+    get_mcp_stats_tracker().record(
+        tool="search_regulations",
+        duration_ms=(time.perf_counter() - started) * 1000,
+        success=True,
+    )
     return {
         "answer": result.answer,
         "sources": [source.__dict__ for source in result.sources],
@@ -99,6 +118,13 @@ class MCPAuthMiddleware:
         await self.app(scope, receive, send)
 
 
+def _parse_allowed_hosts() -> list[str]:
+    """Split the configured MCP host allow-list into individual entries."""
+    # Shared by the transport-security builder and the status endpoint so the
+    # panel can never display an allow-list different from the enforced one.
+    return [h.strip() for h in settings.mcp_allowed_hosts.split(",") if h.strip()]
+
+
 def _build_transport_security() -> TransportSecuritySettings:
     """Translate the configured MCP host allow-list into SDK transport settings.
 
@@ -106,7 +132,7 @@ def _build_transport_security() -> TransportSecuritySettings:
     defaults to 127.0.0.1 and therefore rejects every remote client with HTTP
     421 — fatal for a remotely deployed backend.
     """
-    allowed = [h.strip() for h in settings.mcp_allowed_hosts.split(",") if h.strip()]
+    allowed = _parse_allowed_hosts()
     if "*" in allowed:
         # Explicit, logged opt-out. Kept as an escape hatch for environments
         # behind a proxy that rewrites Host unpredictably, but never the default.
@@ -140,3 +166,36 @@ def build_mcp_asgi_app() -> ASGIApp:
     )
     asgi_app.add_middleware(MCPAuthMiddleware)
     return asgi_app
+
+
+async def get_mcp_status(public_url: str) -> dict:
+    """Assemble the MCP status payload shown on the System Status page.
+
+    Owned by this module rather than the status route so that MCP internals
+    (the tool registry, the allow-list format, the stats tracker) stay behind
+    one boundary; the route only supplies public_url, which is the one value
+    only the HTTP layer can know.
+    """
+    stats = get_mcp_stats_tracker().snapshot()
+    # list_tools() reads the in-memory registry populated by @mcp.tool() at
+    # import time, so the panel always reflects what is actually advertised
+    # rather than a hand-maintained duplicate list.
+    tools = await mcp.list_tools()
+    return {
+        "endpoint_url": public_url,
+        "auth_required": settings.auth_enabled,
+        "allowed_hosts": _parse_allowed_hosts(),
+        "tools": [
+            {
+                "name": tool.name,
+                "description": (tool.description or "").strip().split("\n")[0],
+                "calls": entry.calls if entry else 0,
+                "errors": entry.errors if entry else 0,
+                "avg_duration_ms": entry.avg_duration_ms if entry else None,
+                "last_called_at": (
+                    entry.last_called_at.isoformat() if entry and entry.last_called_at else None
+                ),
+            }
+            for tool, entry in ((tool, stats.get(tool.name)) for tool in tools)
+        ],
+    }

backend/app/mcp/stats.py

@@ -0,0 +1,91 @@
+"""In-memory per-tool call counters for the MCP server.
+
+Lives in `app/mcp/` rather than `app/shared/` because these counters are
+meaningful only for the MCP transport: they answer "is anything actually
+calling our MCP endpoint, and does it work?" for the System Status page.
+Token consumption is deliberately not tracked here — MCP tool calls route
+through AgentConversationService.ask() like every other caller, so the
+existing ModelUsageTracker already accounts for it.
+
+Counters are process-local and reset on restart. That is an accepted
+tradeoff, recorded in the design spec: nothing billable depends on them.
+"""
+
+from __future__ import annotations
+
+import threading
+from dataclasses import dataclass
+from datetime import datetime, timezone
+from functools import lru_cache
+
+from loguru import logger
+
+
+@dataclass
+class MCPToolStats:
+    """Accumulated call outcomes for a single MCP tool."""
+
+    calls: int = 0
+    errors: int = 0
+    total_duration_ms: float = 0.0
+    last_called_at: datetime | None = None
+
+    @property
+    def avg_duration_ms(self) -> float | None:
+        """Mean call duration, or None when the tool has never been called.
+
+        Returning None rather than 0.0 keeps "never called" distinguishable
+        from "called, but instantaneous" in the status UI.
+        """
+        if self.calls == 0:
+            return None
+        return self.total_duration_ms / self.calls
+
+
+class MCPStatsTracker:
+    """Thread-safe registry of per-tool MCP call statistics.
+
+    The lock is load-bearing, not defensive habit: the mcp SDK dispatches
+    synchronous tool functions through anyio.to_thread.run_sync, so tool
+    bodies genuinely run on multiple worker threads at once — unlike the
+    async REST routes, which are serialized by the event loop.
+    """
+
+    def __init__(self) -> None:
+        """Initialize an empty registry guarded by a single lock."""
+        self._tools: dict[str, MCPToolStats] = {}
+        # One coarse lock is enough: record() runs once per MCP tool call and
+        # snapshot() is only read by the low-traffic status endpoint.
+        self._lock = threading.Lock()
+
+    def record(self, *, tool: str, duration_ms: float, success: bool) -> None:
+        """Record the outcome of one MCP tool invocation.
+
+        Never raises: a defect in observability code must not turn a working
+        tool call into a protocol error for the client.
+        """
+        try:
+            # Coerce outside the lock so a bad argument cannot abort mid-update
+            # and leave calls incremented but duration unaccounted for.
+            duration = float(duration_ms)
+            now = datetime.now(timezone.utc)
+            with self._lock:
+                stats = self._tools.setdefault(tool, MCPToolStats())
+                stats.calls += 1
+                if not success:
+                    stats.errors += 1
+                stats.total_duration_ms += duration
+                stats.last_called_at = now
+        except Exception as exc:  # noqa: BLE001 - tracking must never break a real call
+            logger.warning("MCPStatsTracker.record failed for tool {} - {}", tool, exc)
+
+    def snapshot(self) -> dict[str, MCPToolStats]:
+        """Return a shallow copy of all tracked tools, safe to read outside the lock."""
+        with self._lock:
+            return dict(self._tools)
+
+
+@lru_cache
+def get_mcp_stats_tracker() -> MCPStatsTracker:
+    """Return the process-wide singleton tracker (mirrors get_model_usage_tracker())."""
+    return MCPStatsTracker()

backend/tests/mcp/test_mcp_stats.py

@@ -0,0 +1,100 @@
+"""Tests for the in-memory MCP per-tool statistics tracker.
+
+These pin the two properties the status panel depends on: counters stay exact
+under the concurrent thread dispatch the mcp SDK uses, and recording never
+raises into a live tool call.
+"""
+
+from __future__ import annotations
+
+import threading
+
+from app.mcp.stats import MCPStatsTracker, MCPToolStats, get_mcp_stats_tracker
+
+
+def test_avg_duration_is_none_before_any_call():
+    """A never-called tool reports None, not 0.0, so the UI can distinguish them."""
+    assert MCPToolStats().avg_duration_ms is None
+
+
+def test_avg_duration_is_the_mean_of_recorded_durations():
+    """Average is computed over all calls, successful or not."""
+    tracker = MCPStatsTracker()
+    for duration in (100.0, 200.0, 300.0):
+        tracker.record(tool="search_regulations", duration_ms=duration, success=True)
+
+    stats = tracker.snapshot()["search_regulations"]
+    assert stats.calls == 3
+    assert stats.avg_duration_ms == 200.0
+
+
+def test_failures_increment_both_calls_and_errors():
+    """errors is a subset of calls, so the UI can show "2 of 3 failed" honestly."""
+    tracker = MCPStatsTracker()
+    tracker.record(tool="t", duration_ms=1.0, success=True)
+    tracker.record(tool="t", duration_ms=1.0, success=False)
+    tracker.record(tool="t", duration_ms=1.0, success=False)
+
+    stats = tracker.snapshot()["t"]
+    assert stats.calls == 3
+    assert stats.errors == 2
+
+
+def test_last_called_at_is_set_and_timezone_aware():
+    """The panel renders this as a local time, which requires an aware datetime."""
+    tracker = MCPStatsTracker()
+    tracker.record(tool="t", duration_ms=1.0, success=True)
+
+    last_called = tracker.snapshot()["t"].last_called_at
+    assert last_called is not None
+    assert last_called.tzinfo is not None
+
+
+def test_concurrent_record_calls_are_not_lost():
+    """8 threads x 100 calls must total exactly 800.
+
+    Without the lock this loses increments non-deterministically. The mcp SDK
+    runs synchronous tool bodies via anyio.to_thread.run_sync, so this is the
+    real dispatch model, not a hypothetical.
+    """
+    tracker = MCPStatsTracker()
+
+    def hammer() -> None:
+        for _ in range(100):
+            tracker.record(tool="search_regulations", duration_ms=1.0, success=True)
+
+    threads = [threading.Thread(target=hammer) for _ in range(8)]
+    for thread in threads:
+        thread.start()
+    for thread in threads:
+        thread.join()
+
+    stats = tracker.snapshot()["search_regulations"]
+    assert stats.calls == 800
+    assert stats.total_duration_ms == 800.0
+
+
+def test_record_swallows_bad_input_instead_of_raising():
+    """A malformed duration must not propagate into the caller's tool call."""
+    tracker = MCPStatsTracker()
+    tracker.record(tool="t", duration_ms="not-a-number", success=True)  # type: ignore[arg-type]
+
+    # Coercion happens before the lock is taken, so the entry is never created
+    # in a half-updated state.
+    assert tracker.snapshot() == {}
+
+
+def test_snapshot_is_a_copy_not_the_live_dict():
+    """Callers mutating the snapshot must not corrupt the tracker."""
+    tracker = MCPStatsTracker()
+    tracker.record(tool="t", duration_ms=1.0, success=True)
+
+    snapshot = tracker.snapshot()
+    snapshot.clear()
+
+    assert "t" in tracker.snapshot()
+
+
+def test_get_mcp_stats_tracker_returns_a_singleton():
+    """Instrumentation and the status route must observe the same counters."""
+    assert get_mcp_stats_tracker() is get_mcp_stats_tracker()

backend/tests/mcp/test_mcp_status.py

@@ -0,0 +1,79 @@
+"""Tests for get_mcp_status(), the payload behind the System Status MCP card.
+
+Covers the join between the live tool registry and the stats tracker, plus
+the two values the route supplies or the settings decide.
+"""
+
+from __future__ import annotations
+
+import asyncio
+from unittest.mock import patch
+
+from app.mcp.stats import MCPStatsTracker
+
+
+def _status(tracker: MCPStatsTracker | None = None, **setting_overrides) -> dict:
+    """Call get_mcp_status() with an isolated tracker and patched settings.
+
+    The real tracker is a process-wide singleton, so tests must inject their
+    own instance or they leak counters into each other.
+    """
+    from app.mcp.server import get_mcp_status, settings
+
+    patched = settings.model_copy(update=setting_overrides)
+    with (
+        patch("app.mcp.server.settings", patched),
+        patch("app.mcp.server.get_mcp_stats_tracker", return_value=tracker or MCPStatsTracker()),
+    ):
+        return asyncio.run(get_mcp_status("http://6.86.80.9:8000/mcp/"))
+
+
+def test_public_url_is_passed_through_unmodified():
+    """The route owns URL resolution; get_mcp_status() must not rewrite it."""
+    assert _status()["endpoint_url"] == "http://6.86.80.9:8000/mcp/"
+
+
+def test_auth_required_follows_settings():
+    """The panel's auth badge must reflect live config, not a hard-coded value."""
+    assert _status(auth_enabled=True)["auth_required"] is True
+    assert _status(auth_enabled=False)["auth_required"] is False
+
+
+def test_allowed_hosts_are_split_and_stripped():
+    """Displayed allow-list must match the one the transport actually enforces."""
+    status = _status(mcp_allowed_hosts="6.86.80.9:* , 127.0.0.1:*,")
+    assert status["allowed_hosts"] == ["6.86.80.9:*", "127.0.0.1:*"]
+
+
+def test_tools_come_from_the_live_registry_with_zeroed_stats():
+    """An advertised but never-called tool reports zeros, not absence."""
+    tools = {tool["name"]: tool for tool in _status()["tools"]}
+
+    assert "search_regulations" in tools
+    assert tools["search_regulations"]["calls"] == 0
+    assert tools["search_regulations"]["errors"] == 0
+    assert tools["search_regulations"]["avg_duration_ms"] is None
+    assert tools["search_regulations"]["last_called_at"] is None
+
+
+def test_recorded_stats_are_joined_onto_the_matching_tool():
+    """Counters recorded by the instrumented tool must surface on that tool's row."""
+    tracker = MCPStatsTracker()
+    tracker.record(tool="search_regulations", duration_ms=120.0, success=True)
+    tracker.record(tool="search_regulations", duration_ms=80.0, success=False)
+
+    tool = next(t for t in _status(tracker)["tools"] if t["name"] == "search_regulations")
+
+    assert tool["calls"] == 2
+    assert tool["errors"] == 1
+    assert tool["avg_duration_ms"] == 100.0
+    # Serialized for JSON transport; the frontend parses it with new Date().
+    assert isinstance(tool["last_called_at"], str)
+
+
+def test_description_is_the_first_docstring_line():
+    """Multi-line tool docstrings must not blow up the card's row height."""
+    tool = next(t for t in _status()["tools"] if t["name"] == "search_regulations")
+
+    assert "\n" not in tool["description"]
+    assert tool["description"].startswith("Search the compliance knowledge base")

docs/architecture/backend-project-architecture.md

@@ -322,17 +322,20 @@ backend/app/
 - 以 Model Context Protocol 对外暴露平台已有能力
 - MCP tool 注册与入参 schema 绑定
 - MCP 专用鉴权（复用现有 JWT）与 Streamable HTTP 子 ASGI 应用装配
+- MCP 传输自身的可观测性：进程内 per-tool 调用计数（`stats.py`），以及供 System Status 页面读取的状态汇总 `get_mcp_status()`
 
 非职责：
 
 - 不实现任何新的检索、问答或业务编排逻辑
 - 不直接访问 Milvus、MinIO、LLM SDK
+- 不统计 token 消耗 —— MCP 调用经由 `AgentConversationService.ask()`，已由 `shared/model_usage_tracker.py` 记账
 
 说明：
 
 - `mcp` 与 `api` 是并列的两个 transport 适配层：`api` 面向 HTTP REST 客户端，`mcp` 面向 MCP 客户端（Claude Desktop、IDE 等）。二者共用同一套 application service。
 - 它独立成顶层模块而不是放进 `api/routes/`，因为 MCP 使用装饰器式 tool 注册和自带的子 ASGI 应用，与 `APIRouter` 是不同的传输机制。
 - 当前实现见 `backend/app/mcp/server.py`，只暴露 `search_regulations` 一个 tool，内部直接调用 `get_agent_conversation_service()`。
+- `api/routes/status.py` 的 `GET /status/mcp` 是薄适配层：它只负责解析对外可达的 URL（`settings.mcp_public_url` 或从请求推导），其余全部交给 `mcp.server.get_mcp_status()`，路由不得直接读取 MCP 内部结构。
 
 ## 5. Module Responsibilities
 

docs/superpowers/plans/2026-08-03-mcp-status-panel.md

@@ -0,0 +1,89 @@
+# MCP Status Panel — Implementation Plan
+
+Spec: `docs/superpowers/specs/2026-08-03-mcp-status-panel-design.md`
+
+Backend first (tests alongside), then frontend, then verify. Each task is
+independently reviewable.
+
+## Task 1 — `app/mcp/stats.py`
+
+- [x] `MCPToolStats` dataclass: `calls: int = 0`, `errors: int = 0`,
+      `total_duration_ms: float = 0.0`, `last_called_at: datetime | None = None`;
+      `avg_duration_ms` property returning `None` when `calls == 0`.
+- [x] `MCPStatsTracker` with `threading.Lock`, `record(tool, duration_ms, success)`,
+      `snapshot()` returning a shallow copy.
+- [x] `record()` wraps its body in `try/except Exception` → `logger.warning`, never raises.
+- [x] `get_mcp_stats_tracker()` with `@lru_cache`.
+- [x] Module docstring + at least one `#` comment (AGENTS.md).
+
+## Task 2 — `backend/tests/mcp/test_mcp_stats.py`
+
+- [x] 8 threads × 100 `record()` calls → `calls == 800` exactly.
+- [x] `avg_duration_ms` is `None` at zero calls, correct mean afterwards.
+- [x] `success=False` increments `errors` and `calls`.
+- [x] `record()` with a non-numeric duration logs and does not raise.
+
+## Task 3 — instrument `app/mcp/server.py`
+
+- [x] Wrap `search_regulations` body: `time.perf_counter()` start,
+      `try/except` records `success=False` and re-raises, `finally` not needed
+      once both branches record.
+- [x] `async def get_mcp_status(public_url: str) -> dict` returning
+      `{endpoint_url, auth_required, allowed_hosts, tools: [...]}` where each
+      tool is `{name, description, calls, errors, avg_duration_ms, last_called_at}`.
+- [x] `allowed_hosts` parsed from `settings.mcp_allowed_hosts` with the same
+      split/strip logic `_build_transport_security()` already uses.
+- [x] `last_called_at` serialized as ISO-8601 string or `None`.
+
+## Task 4 — `mcp_public_url` setting
+
+- [x] `app/config/settings.py`: `mcp_public_url: str = ""` in the existing `# ── MCP ──` block.
+- [x] `.env.example`: documented under the existing MCP section, in Chinese,
+      with the `http://6.86.80.9:8000/mcp/` example and a note that it is only
+      needed when a proxy rewrites `Host`.
+
+## Task 5 — `GET /status/mcp`
+
+- [x] Add route to `backend/app/api/routes/status.py`, taking `request: Request`.
+- [x] `public_url = settings.mcp_public_url or f"{str(request.base_url).rstrip('/')}/mcp/"`.
+- [x] Delegate to `get_mcp_status()`; no MCP internals in the route.
+
+## Task 6 — `backend/tests/mcp/test_mcp_status.py`
+
+- [x] Tool advertised with zeroed stats before any call.
+- [x] Stats reflected after `record()`.
+- [x] `auth_required` follows a patched `settings.auth_enabled`.
+- [x] `public_url` passes through unmodified.
+
+## Task 7 — frontend types + client
+
+- [x] `frontend/src/api/index.ts`: `MCPToolEntry`, `MCPStatusResponse`.
+- [x] `frontend/src/api/status.ts`: `getMCPStatus()` + re-export.
+
+## Task 8 — MCP Server card
+
+- [x] Add `getMCPStatus()` to the existing `Promise.allSettled` batch in
+      `StatusPage.tsx`, with its own `mcpLoading` state.
+- [x] Card below "AI Models": endpoint row + one row per tool.
+- [x] Copy-config button: builds the `mcpServers` JSON, embeds the
+      `localStorage` token when `auth_required`, writes via
+      `navigator.clipboard.writeText`, and reflects success/failure in its label
+      for ~2s.
+- [x] `handleExport()` includes `mcp`.
+- [x] Reuse `card` / `card-header` / `service-row` / `StatusIcon`. No new CSS.
+
+## Task 9 — i18n
+
+- [x] `locales/zh.ts` and `locales/en.ts`: `cardMcp`, `mcpEndpoint`,
+      `mcpAuthRequired`, `mcpAuthDisabled`, `mcpAllowedHosts`, `mcpCopyConfig`,
+      `mcpCopied`, `mcpCopyFailed`, `mcpCalls`, `mcpErrors`, `mcpAvgDuration`,
+      `mcpNoTools`, `mcpUnavailable`.
+- [x] Both files must stay structurally identical (`en.ts` is typed against `zh.ts`).
+
+## Task 10 — verify
+
+- [x] `python -m pytest backend/tests -q` — all pass.
+- [x] `npm --prefix frontend run lint`.
+- [x] `npm --prefix frontend run build`.
+- [x] Live check: start uvicorn, `GET /api/v1/status/mcp`, confirm the tool is
+      listed and counters move after a real MCP `tools/call`.

frontend/src/api/index.ts

@@ -333,4 +333,22 @@ export interface ModelUsageResponse {
   models: ModelUsageEntry[];
 }
 
+/** One tool advertised by the MCP server, joined with its in-memory call counters. */
+export interface MCPToolEntry {
+  name: string;
+  description: string;
+  calls: number;
+  errors: number;
+  /** null when the tool has never been called — distinct from an average of 0. */
+  avg_duration_ms: number | null;
+  last_called_at: string | null;
+}
+
+export interface MCPStatusResponse {
+  endpoint_url: string;
+  auth_required: boolean;
+  allowed_hosts: string[];
+  tools: MCPToolEntry[];
+}
+
 export { API_BASE_URL };

frontend/src/api/status.ts

@@ -1,4 +1,4 @@
-import { fetchAPI, type ModelUsageResponse, type SystemConfig, type SystemHealth, type SystemStats } from './index';
+import { fetchAPI, type MCPStatusResponse, type ModelUsageResponse, type SystemConfig, type SystemHealth, type SystemStats } from './index';
 
 export async function getSystemStats(): Promise<SystemStats> {
   return fetchAPI<SystemStats>('/status/stats');
@@ -22,4 +22,9 @@ export async function pingModelConnections(): Promise<ModelUsageResponse> {
   return fetchAPI<ModelUsageResponse>('/status/models/ping', { method: 'POST' });
 }
 
-export type { ModelUsageResponse, SystemConfig, SystemHealth, SystemStats };
+/** MCP endpoint config, advertised tools, and per-tool call counters. */
+export async function getMCPStatus(): Promise<MCPStatusResponse> {
+  return fetchAPI<MCPStatusResponse>('/status/mcp');
+}
+
+export type { MCPStatusResponse, ModelUsageResponse, SystemConfig, SystemHealth, SystemStats };

frontend/src/locales/en.ts

@@ -143,6 +143,19 @@ export interface Translations {
     modelStatusDisabled: string;
     sharesUsageWithMain: string;
     lastCalledNever: string;
+    cardMcp: string;
+    mcpEndpoint: string;
+    mcpAuthRequired: string;
+    mcpAuthDisabled: string;
+    mcpAllowedHosts: string;
+    mcpCopyConfig: string;
+    mcpCopied: string;
+    mcpCopyFailed: string;
+    mcpCalls: string;
+    mcpErrors: string;
+    mcpAvgDuration: string;
+    mcpNoTools: string;
+    mcpUnavailable: string;
   };
   docs: {
     topbarTitle: string;
@@ -415,6 +428,19 @@ export const en: Translations = {
     modelStatusDisabled: 'Disabled',
     sharesUsageWithMain: 'Shares usage with main LLM',
     lastCalledNever: 'Never',
+    cardMcp: 'MCP Server',
+    mcpEndpoint: 'Endpoint',
+    mcpAuthRequired: 'Auth required',
+    mcpAuthDisabled: 'No auth',
+    mcpAllowedHosts: 'Allowed hosts',
+    mcpCopyConfig: 'Copy client config',
+    mcpCopied: 'Copied',
+    mcpCopyFailed: 'Copy failed',
+    mcpCalls: 'calls',
+    mcpErrors: 'errors',
+    mcpAvgDuration: 'avg',
+    mcpNoTools: 'No MCP tools registered',
+    mcpUnavailable: 'MCP status endpoint unavailable',
   },
   docs: {
     topbarTitle: 'Document Management',

frontend/src/locales/zh.ts

@@ -144,6 +144,19 @@ export const zh: Translations = {
     modelStatusDisabled: '已禁用',
     sharesUsageWithMain: '与主 LLM 共用统计',
     lastCalledNever: '从未',
+    cardMcp: 'MCP 服务',
+    mcpEndpoint: '接入端点',
+    mcpAuthRequired: '需鉴权',
+    mcpAuthDisabled: '未鉴权',
+    mcpAllowedHosts: 'Host 白名单',
+    mcpCopyConfig: '复制接入配置',
+    mcpCopied: '已复制',
+    mcpCopyFailed: '复制失败',
+    mcpCalls: '调用',
+    mcpErrors: '失败',
+    mcpAvgDuration: '平均',
+    mcpNoTools: '未注册任何 MCP 工具',
+    mcpUnavailable: 'MCP 状态接口不可用',
   },
   docs: {
     topbarTitle: '文档管理',

frontend/src/pages/Status/StatusPage.tsx

@@ -1,10 +1,10 @@
 import { useState, useEffect } from 'react';
 import { Topbar } from '../../components/layout/Topbar';
-import { Search, Upload, Download, RefreshCw, CheckCircle, XCircle, AlertTriangle, Info } from 'lucide-react';
+import { Search, Upload, Download, RefreshCw, CheckCircle, XCircle, AlertTriangle, Info, Copy } from 'lucide-react';
 import { UploadModal } from '../Docs/UploadModal';
 import { useLanguage } from '../../contexts/LanguageContext';
-import { getModelUsage, pingModelConnections } from '../../api/status';
-import type { ModelUsageEntry } from '../../api/index';
+import { getMCPStatus, getModelUsage, pingModelConnections } from '../../api/status';
+import type { MCPStatusResponse, ModelUsageEntry } from '../../api/index';
 
 const TOKEN_KEY = 'auth_token';
 function authHeader(): Record<string, string> {
@@ -90,11 +90,15 @@ export function StatusPage() {
   const [lastRefresh, setLastRefresh] = useState<Date | null>(null);
   const [modelUsage, setModelUsage] = useState<ModelUsageEntry[] | null>(null);
   const [pinging, setPinging] = useState(false);
+  const [mcp, setMcp] = useState<MCPStatusResponse | null>(null);
+  const [mcpLoading, setMcpLoading] = useState(true);
+  const [copyState, setCopyState] = useState<'idle' | 'ok' | 'fail'>('idle');
 
   useEffect(() => {
     setLoading(true);
     setHealthLoading(true);
     setModelsLoading(true);
+    setMcpLoading(true);
 
     // Fetch all endpoints in parallel. The first three use raw fetch() (legacy
     // pattern already established in this file); model usage uses the typed
@@ -104,7 +108,8 @@ export function StatusPage() {
       fetch('/api/v1/status/health', { headers: authHeader() }).then(r => r.json()),
       fetch('/api/v1/status/config', { headers: authHeader() }).then(r => r.json()),
       getModelUsage(),
-    ]).then(([statsRes, healthRes, configRes, modelsRes]) => {
+      getMCPStatus(),
+    ]).then(([statsRes, healthRes, configRes, modelsRes, mcpRes]) => {
       if (statsRes.status === 'fulfilled') setStats(statsRes.value);
       else setStats({ documents_total: 0, documents_indexed: 0, documents_failed: 0, chunks_total: 0 });
 
@@ -112,10 +117,13 @@ export function StatusPage() {
       if (configRes.status === 'fulfilled') setConfig(configRes.value);
       if (modelsRes.status === 'fulfilled') setModelUsage(modelsRes.value.models);
       else setModelUsage(null);
+      // A failing MCP endpoint must degrade to a muted card, never blank the page.
+      setMcp(mcpRes.status === 'fulfilled' ? mcpRes.value : null);
 
       setLoading(false);
       setHealthLoading(false);
       setModelsLoading(false);
+      setMcpLoading(false);
       setLastRefresh(new Date());
     });
   }, [refreshKey]);
@@ -140,7 +148,7 @@ export function StatusPage() {
 
   // ── Export ───────────────────────────────────────────────────────────────
   function handleExport() {
-    const data = { stats, health, config, exportedAt: new Date().toISOString() };
+    const data = { stats, health, config, mcp, exportedAt: new Date().toISOString() };
     const blob = new Blob([JSON.stringify(data, null, 2)], { type: 'application/json' });
     const url = URL.createObjectURL(blob);
     const a = document.createElement('a');
@@ -180,6 +188,34 @@ export function StatusPage() {
     return new Date(entry.last_called_at).toLocaleTimeString(undefined, { hour: '2-digit', minute: '2-digit' });
   }
 
+  /** Build the mcpServers block Claude Desktop / Cursor accept for a Streamable HTTP server. */
+  function buildMCPClientConfig(status: MCPStatusResponse): string {
+    const token = localStorage.getItem(TOKEN_KEY);
+    const server: Record<string, unknown> = { url: status.endpoint_url };
+    // Omit the header entirely when the backend runs unauthenticated, so the
+    // pasted config never carries a stale "Bearer null".
+    if (status.auth_required && token) server.headers = { Authorization: `Bearer ${token}` };
+    return JSON.stringify({ mcpServers: { 'ai-regulations': server } }, null, 2);
+  }
+
+  async function handleCopyMCPConfig() {
+    if (!mcp) return;
+    try {
+      await navigator.clipboard.writeText(buildMCPClientConfig(mcp));
+      setCopyState('ok');
+    } catch {
+      // clipboard.writeText rejects on insecure origins and denied permissions.
+      // Surface it: a silent no-op would leave the operator pasting stale data.
+      setCopyState('fail');
+    }
+    setTimeout(() => setCopyState('idle'), 2000);
+  }
+
+  function mcpDurationLabel(ms: number | null): string {
+    if (ms === null) return '—';
+    return ms >= 1000 ? `${(ms / 1000).toFixed(1)}s` : `${Math.round(ms)}ms`;
+  }
+
   return (
     <div className="status-page">
       <Topbar
@@ -344,6 +380,65 @@ export function StatusPage() {
               )}
             </div>
 
+            {/* MCP server — endpoint config + advertised tools + call counters */}
+            <div className="card">
+              <div className="card-header" style={{ display: 'flex', alignItems: 'center', justifyContent: 'space-between' }}>
+                <span>{t.status.cardMcp}</span>
+                <button className="btn sm" onClick={handleCopyMCPConfig} disabled={!mcp}>
+                  <Copy size={13} />
+                  {copyState === 'ok' ? t.status.mcpCopied : copyState === 'fail' ? t.status.mcpCopyFailed : t.status.mcpCopyConfig}
+                </button>
+              </div>
+
+              {mcpLoading ? (
+                <div style={{ padding: '12px 0', display: 'flex', flexDirection: 'column', gap: 10 }}>
+                  {[1, 2].map(i => <div key={i} className="loading-shimmer" style={{ height: 28, borderRadius: 6 }} />)}
+                </div>
+              ) : mcp ? (
+                <>
+                  <div className="service-row">
+                    <StatusIcon status="ok" />
+                    <span className="service-name" style={{ marginLeft: 8 }}>{t.status.mcpEndpoint}</span>
+                    <span style={{ fontSize: 11, color: 'var(--muted)', marginLeft: 6, fontFamily: 'var(--font-mono)', wordBreak: 'break-all' }}>
+                      {mcp.endpoint_url}
+                    </span>
+                    <span className={`status ${mcp.auth_required ? 'ok' : 'warn'}`} style={{ marginLeft: 'auto' }}>
+                      {mcp.auth_required ? t.status.mcpAuthRequired : t.status.mcpAuthDisabled}
+                    </span>
+                  </div>
+
+                  <div className="service-row">
+                    <StatusIcon status="info" />
+                    <span className="service-name" style={{ marginLeft: 8 }}>{t.status.mcpAllowedHosts}</span>
+                    <span style={{ fontSize: 11, color: 'var(--muted)', marginLeft: 6, fontFamily: 'var(--font-mono)', wordBreak: 'break-all' }}>
+                      {mcp.allowed_hosts.join(', ') || '—'}
+                    </span>
+                  </div>
+
+                  {mcp.tools.length === 0 ? (
+                    <div style={{ padding: '12px 0', color: 'var(--muted)', fontSize: 13 }}>{t.status.mcpNoTools}</div>
+                  ) : mcp.tools.map(tool => (
+                    <div className="service-row" key={tool.name}>
+                      <StatusIcon status={tool.errors > 0 ? 'warn' : tool.calls > 0 ? 'ok' : 'info'} />
+                      <span className="service-name" style={{ marginLeft: 8, fontFamily: 'var(--font-mono)' }}>{tool.name}</span>
+                      <span style={{ fontSize: 11, color: 'var(--muted)', marginLeft: 6 }}>
+                        {`${t.status.mcpCalls} ${tool.calls}`}
+                        {tool.errors > 0 && ` · ${t.status.mcpErrors} ${tool.errors}`}
+                        {` · ${t.status.mcpAvgDuration} ${mcpDurationLabel(tool.avg_duration_ms)}`}
+                      </span>
+                      <span style={{ marginLeft: 'auto', fontFamily: 'var(--font-mono)', fontSize: 11, color: 'var(--muted)' }}>
+                        {tool.last_called_at
+                          ? new Date(tool.last_called_at).toLocaleTimeString(undefined, { hour: '2-digit', minute: '2-digit' })
+                          : t.status.lastCalledNever}
+                      </span>
+                    </div>
+                  ))}
+                </>
+              ) : (
+                <div style={{ padding: '12px 0', color: 'var(--muted)', fontSize: 13 }}>{t.status.mcpUnavailable}</div>
+              )}
+            </div>
+
             {/* System config (collapsible) */}
             <div className="card">
               <button