LocalFree

EffectFence MCP server

aurumflux20/effectfence

Prevents double charges and duplicate side effects from agent tool calls: concurrent races elect one winner, late duplicates replay a sealed receipt.

0 GitHub stars173 npm downloads / month
Source code

Install EffectFence in Claude Code

Claude Code
claude mcp add effectfence -- npx -y effectfence
mcp.json (Claude Desktop, Cursor, VS Code, Windsurf)
{
  "mcpServers": {
    "effectfence": {
      "command": "npx",
      "args": [
        "-y",
        "effectfence"
      ]
    }
  }
}

Frequently asked questions

What does the EffectFence MCP server do?

Prevents double charges and duplicate side effects from agent tool calls: concurrent races elect one winner, late duplicates replay a sealed receipt.

Is the EffectFence MCP server free?

Yes, most likely. Open source and no paid account or API key is mentioned in the listing. Check the provider for current pricing.

Does EffectFence run locally or remotely?

Local. Runs on your machine (stdio). You install it with npx, uvx, Docker or from source.

How do I add EffectFence to Claude Code?

Run: claude mcp add effectfence -- npx -y effectfence

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