How do I record a trace from Claude Desktop?

[adityachilka1]

I have @modelcontextprotocol/server-filesystem configured in Claude Desktop. How do I capture a .mcptrace of every JSON-RPC frame it sends/receives?

[adityachilka1]

Wrap the server with the mcp-devtools proxy in your Claude Desktop config.

Before:

"filesystem": { "command": "npx", "args": ["@modelcontextprotocol/server-filesystem", "/tmp"] }

After:

"filesystem": { "command": "npx", "args": ["@adityachilka/mcp-devtools", "proxy", "--record", "trace.mcptrace", "--", "npx", "@modelcontextprotocol/server-filesystem", "/tmp"] }

Restart Claude Desktop. The trace file is written to your current working directory.