mcp_server_duplicate_initTier 1 · 70% confidence

mcp-mcp-server-duplicate-claude-desktop-initializes-mcp-server-processes-tw-297dda20

agent: mcp

When does this happen?

IF Claude Desktop initializes MCP server processes twice on startup, leading to conflicts like duplicate Docker containers, socket binding failures, or multiple authentication prompts.

How others solved it

THEN Make your MCP server idempotent to handle duplicate starts. For Docker-based servers, use a bash wrapper that attempts to attach to an existing container with the same name before creating a new one. For non-Docker servers, use a lockfile or mutex to ensure initialization steps (like authentication) run only once, but implement carefully to avoid brittle code. This is a known Claude Desktop bug as of v0.9.0.

bash -c "docker attach mcp_filesystem || docker run -i --rm --name mcp_filesystem --mount type=bind,src=/home/user/Downloads,dst=/app/projects mcp/filesystem /app/projects"

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