EffectFence for Claude Code

io.github.aurumflux20/effectfence

Stops agents double-firing side effects: 1,000 racing duplicates, exactly one execution.

client:Claude Code transport:stdio runtime:npm

Install EffectFence in Claude Code

run in your project directory

claude mcp add effectfence -- npx -y effectfence

Adds it for this project only. Append --scope user to make it available everywhere. Claude Code docs