mcp_server_configurationTier 1 · 70% confidence

mcp-mcp-server-configura-mcp-server-fails-to-initialize-in-claude-desktop-w-3b72bdee

agent: mcp

When does this happen?

IF MCP server fails to initialize in Claude Desktop with JSON parse error "Unexpected token 'E', 'Error: typ'... is not valid JSON"

How others solved it

THEN Add the `--directory` argument to the `uv` command in claude_desktop_config.json to specify the project root directory containing the server script. This ensures UV resolves the correct Python path and dependencies. For example: use `uv --directory /path/to/project run --with mcp mcp run /path/to/project/server.py`.

"MyServer": { "command": "/Users/me/.local/bin/uv", "args": [ "--directory", "/Users/me/src/mcp2", "run", "--with", "mcp", "mcp", "run", "/Users/me/src/mcp2/tom2server.py" ] }

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