Koskamo

EffectFence MCP

EffectFence is a causal concurrency fence for multi-agent tool calls that guarantees exactly one execution of side-effecting operations. It prevents double-charges and duplicate side effects by using atomic compare-exchange reservations for same-instant races and replaying recorded outcomes for late duplicates. It ships as a Rust library and MCP server, ensuring agent safety and idempotency in multi-agent systems.

Package and access

Local package with source-attributed installation metadata. Koskamo does not execute packages during review.

EffectFence MCP logo, by aurumflux20Community listingLocal stdioSource reviewed; not executedPublished by aurumflux20
Vendor documentation

What you can do with it

  • Prevent double-charges in agent-payment implementations
  • Stop duplicate side effects in multi-agent tool calls
  • Ensure exactly-once execution for concurrent agent races
  • Verify causal consistency for agent decisions

Source and maintenance

Community listingRegistry 0.3.0
mcp-registry: io.github.aurumflux20/effectfence@0.3.0Source repository
Maintenance checked

Packages and installation

Source-provided package data. Koskamo has not executed or live-probed this package.

effectfence 0.3.0

npm
effectfence package definition
{
  "version": "0.3.0",
  "transport": "stdio",
  "identifier": "effectfence",
  "registryType": "npm",
  "registryBaseUrl": "https://registry.npmjs.org"
}

Tools

Reported by the attributed source; not independently observed by Koskamo.

No tool definitions available.

Connect from your client

Each snippet configures the same source-provided package; replace placeholders before use.

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Cursor

Merge this local stdio configuration, replace every placeholder environment value, and restart Cursor. Koskamo has not executed this package.
Cursor configuration
{
  "mcpServers": {
    "effectfence-mcp": {
      "command": "npx",
      "args": [
        "-y",
        "effectfence@0.3.0"
      ]
    }
  }
}

Cline

Merge this local stdio configuration, replace every placeholder environment value, and restart Cline. Koskamo has not executed this package.
Cline configuration
{
  "mcpServers": {
    "effectfence-mcp": {
      "command": "npx",
      "args": [
        "-y",
        "effectfence@0.3.0"
      ]
    }
  }
}

VS Code

Merge this local stdio configuration, replace every placeholder environment value, and restart VS Code. Koskamo has not executed this package.
VS Code configuration
{
  "servers": {
    "effectfence-mcp": {
      "type": "stdio",
      "command": "npx",
      "args": [
        "-y",
        "effectfence@0.3.0"
      ]
    }
  }
}

Claude Desktop

Merge this local stdio configuration, replace every placeholder environment value, and restart Claude Desktop. Koskamo has not executed this package.
Claude Desktop configuration
{
  "mcpServers": {
    "effectfence-mcp": {
      "command": "npx",
      "args": [
        "-y",
        "effectfence@0.3.0"
      ]
    }
  }
}

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