feat(mcp): gestionnaire de sessions lazy + conversion schémas + appels

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

backend/tests/test_mcp_manager.py

@@ -0,0 +1,82 @@
+import os
+import sys
+import tempfile
+import textwrap
+
+os.environ.setdefault("DATA_DIR", tempfile.mkdtemp())
+os.environ.setdefault("WORKSPACE_DIR", tempfile.mkdtemp())
+
+import pytest  # noqa: E402
+
+from app import db, mcp_client  # noqa: E402
+
+db.init_db()
+
+# Serveur MCP minimal : un outil "echo" qui renvoie son argument.
+_FAKE_SERVER = textwrap.dedent("""
+    from mcp.server.fastmcp import FastMCP
+    mcp = FastMCP("fake")
+
+    @mcp.tool()
+    def echo(text: str) -> str:
+        \"\"\"Répète le texte fourni.\"\"\"
+        return "echo:" + text
+
+    mcp.run()
+""")
+
+
+@pytest.fixture()
+def fake_server_cmd(tmp_path):
+    path = tmp_path / "fake_mcp.py"
+    path.write_text(_FAKE_SERVER, encoding="utf-8")
+    return [sys.executable, str(path)]
+
+
+@pytest.mark.asyncio
+async def test_tools_exposed_and_called(fake_server_cmd, monkeypatch):
+    monkeypatch.setitem(
+        mcp_client.CATALOG, "fake",
+        {"label": "Fake", "description": "", "command": fake_server_cmd,
+         "url_param": False, "env_params": [], "expose": None},
+    )
+    mcp_client.set_mcp_state("fake", enabled=True, params={})
+    mgr = mcp_client.McpManager()
+    try:
+        defs = await mgr.tool_definitions()
+        names = [d["function"]["name"] for d in defs]
+        assert "mcp_fake_echo" in names
+        result = await mgr.call_tool("mcp_fake_echo", {"text": "bonjour"})
+        assert result["ok"] is True
+        assert "echo:bonjour" in result["content"]
+    finally:
+        await mgr.aclose()
+        mcp_client.set_mcp_state("fake", enabled=False, params={})
+
+
+@pytest.mark.asyncio
+async def test_disabled_server_exposes_nothing():
+    mgr = mcp_client.McpManager()
+    try:
+        assert await mgr.tool_definitions() == []
+    finally:
+        await mgr.aclose()
+
+
+@pytest.mark.asyncio
+async def test_broken_server_never_raises(monkeypatch):
+    monkeypatch.setitem(
+        mcp_client.CATALOG, "broken",
+        {"label": "Broken", "description": "",
+         "command": [sys.executable, "-c", "import sys; sys.exit(3)"],
+         "url_param": False, "env_params": [], "expose": None},
+    )
+    mcp_client.set_mcp_state("broken", enabled=True, params={})
+    mgr = mcp_client.McpManager()
+    try:
+        assert await mgr.tool_definitions() == []
+        assert mgr.statuses()["broken"]["state"] == "error"
+        assert any("broken" in n.lower() or "Broken" in n for n in mgr.notices())
+    finally:
+        await mgr.aclose()
+        mcp_client.set_mcp_state("broken", enabled=False, params={})