Improve local agent chat and device health detection

apps/device-host-agent/host_agent/web/app.py

@@ -20,6 +20,7 @@ from host_agent.client import (
     HostTaskSubmissionUnknownError,
 )
 from host_agent.config import HostAgentConfig
+from host_agent.conversation import ConversationAgent
 from host_agent.devices import register_local_device, unregister_local_device
 from host_agent.history import ConsoleHistoryStore
 from host_agent.identity import HostIdentityStore
@@ -232,6 +233,7 @@ def create_console_app(
     mcp_server: FastMCP | None = None,
     mcp_token_store: McpTokenStore | None = None,
     mcp_busy_tracker: McpBusyTracker | None = None,
+    conversation_agent: ConversationAgent | None = None,
 ) -> FastAPI:
     app = FastAPI(title="Host Agent Console")
     cookie_secure = config.console_bind_host not in _LOOPBACK_BIND_HOSTS
@@ -415,6 +417,31 @@ def create_console_app(
             }
         )
 
+    @app.post("/api/chat")
+    async def api_chat(
+        request: Request,
+        session: SessionState = Depends(require_csrf),
+    ) -> JSONResponse:
+        if conversation_agent is None:
+            raise HTTPException(status_code=503, detail="chat agent is not configured")
+        payload = await request.json()
+        raw_messages = payload.get("messages") if isinstance(payload, dict) else None
+        if not isinstance(raw_messages, list) or not raw_messages:
+            raise HTTPException(status_code=400, detail="messages must be a non-empty list")
+        messages = [
+            {"role": str(item["role"]), "content": str(item["content"])}
+            for item in raw_messages
+            if isinstance(item, dict)
+            and item.get("role") in {"user", "assistant"}
+            and isinstance(item.get("content"), str)
+        ]
+        if not messages:
+            raise HTTPException(status_code=400, detail="messages are invalid")
+        result = await asyncio.to_thread(conversation_agent.chat, messages)
+        return JSONResponse(
+            {"content": result.content, "tool_calls": result.tool_calls}
+        )
+
     @app.get("/devices", response_class=HTMLResponse)
     async def devices_page(
         request: Request,