#!/usr/bin/env python3
"""
Test MCP server that demonstrates error handling.
This script outputs both valid JSON-RPC and error messages to test Reticle.
"""
import sys
import json
import time
def send_jsonrpc(obj):
"""Send a JSON-RPC message to stdout."""
print(json.dumps(obj), flush=True)
def send_stderr(msg):
"""Send an error message to stderr."""
print(msg, file=sys.stderr, flush=True)
def main():
# Send some stderr output first (like Python warnings on startup)
send_stderr("Warning: This is a test warning from the MCP server")
send_stderr("DEBUG: Server starting up...")
# Send a valid JSON-RPC notification
send_jsonrpc({
"jsonrpc": "2.0",
"method": "notifications/initialized"
})
time.sleep(0.5)
# Send raw stdout (non-JSON)
print("This is raw stdout output - not JSON-RPC!", flush=True)
print("Another raw line with some debug info", flush=True)
time.sleep(0.5)
# Simulate a Python exception/traceback
send_stderr("""Traceback (most recent call last):
File "/path/to/mcp_server.py", line 42, in handle_request
result = process_tool_call(params)
File "/path/to/mcp_server.py", line 78, in process_tool_call
raise ValueError("Invalid tool arguments")
ValueError: Invalid tool arguments""")
time.sleep(0.5)
# Send another valid JSON-RPC message
send_jsonrpc({
"jsonrpc": "2.0",
"id": 1,
"result": {
"tools": [
{"name": "test_tool", "description": "A test tool"}
]
}
})
time.sleep(0.5)
# More stderr
send_stderr("ERROR: Something went wrong!")
send_stderr("CRITICAL: Database connection failed")
# Final JSON-RPC
send_jsonrpc({
"jsonrpc": "2.0",
"id": 2,
"error": {
"code": -32603,
"message": "Internal error",
"data": {"details": "Connection timeout"}
}
})
# Keep running briefly so the proxy can read all output
time.sleep(1)
if __name__ == "__main__":
main()
