"""A fake stdio MCP server for the debugger forwarder test: one tool that echoes, one that fails."""
import json
import sys

for line in sys.stdin:
    msg = json.loads(line)
    if "id" not in msg:
        continue
    if msg["method"] == "initialize":
        result = {"protocolVersion": "2025-06-18"}
    elif msg["method"] == "tools/list":
        result = {"tools": [{"name": "echo", "description": "Echo", "inputSchema": {"properties": {"x": {}}}}]}
    elif msg["params"]["name"] == "echo":
        result = {"content": [{"type": "text", "text": "echo " + json.dumps(msg["params"]["arguments"])}]}
    else:
        result = {"isError": True, "content": [{"type": "text", "text": "no such session"}]}
    print(json.dumps({"jsonrpc": "2.0", "method": "notifications/message", "params": {}}), flush=True)
    print(json.dumps({"jsonrpc": "2.0", "id": msg["id"], "result": result}), flush=True)