feat(api-server): add mcp sse client connection

https://modelcontextprotocol.io/docs/concepts/transports#python-client
https://github.com/krishnaik06/MCP-CRASH-Course/blob/main/mcpserver/client-sse.py

Author: NicholasGoh

backend/api/routers/mcps.py

@@ -0,0 +1,51 @@
+from contextlib import asynccontextmanager
+from typing import Iterable
+
+from config import settings
+from fastapi import APIRouter
+from mcp import ClientSession, types
+from mcp.client.sse import sse_client
+
+from shared_mcp.models import ToolRequest
+
+router = APIRouter(prefix="/mcps", tags=["mcps"])
+
+
+@asynccontextmanager
+async def mcp_sse_client():
+    async with sse_client(f"http://mcp:{settings.mcp_server_port}/sse") as (
+        read_stream,
+        write_stream,
+    ):
+        async with ClientSession(read_stream, write_stream) as session:
+            await session.initialize()
+            yield session
+
+
+@router.get("/list-tools")
+async def list_tools() -> Iterable[types.Tool]:
+    """
+    Lists tools available from MCP server
+
+    This endpoint establishes a Server-Sent Events connection with the client
+    and forwards communication to the Model Context Protocol server.
+    """
+    async with mcp_sse_client() as session:
+        response = await session.list_tools()
+        return response.tools
+
+
+@router.post("/call-tool")
+async def call_tool(request: ToolRequest) -> str:
+    """
+    Calls tool available from MCP server
+
+    This endpoint establishes a Server-Sent Events connection with the client
+    and forwards communication to the Model Context Protocol server.
+    """
+    async with mcp_sse_client() as session:
+        response = await session.call_tool(
+            request.tool_name,
+            arguments=request.model_dump(exclude=["tool_name"]),
+        )
+        return response.content[0].text