Koskamo

falsepass MCP

falsepass is an MCP server that probes RL environment verifiers for false passes and false fails. It calls an environment's own reward code on completions with known verdicts to report disagreements, such as wrong answers receiving reward. It supports frameworks like Environments Hub, OpenEnv, Inspect AI, and HUD, providing tools for scanning, auditing, and reproducing grader defects without requiring models or GPUs.

Package and access

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

falsepass MCP logo, by Super-EricCommunity listingLocal stdioSource reviewed; not executedPublished by Super-Eric
Vendor documentation

What you can do with it

  • Scan RL environment graders for reward hacking vulnerabilities
  • Audit grader logic against known-good and known-bad completions
  • Reproduce specific grader defects with isolated test cases
  • Integrate grader testing into CI/CD pipelines via GitHub Actions

Source and maintenance

Community listingRegistry 0.12.0
mcp-registry: io.github.Super-Eric/falsepass@0.12.0Source repositoryProject website
Maintenance checked

Packages and installation

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

falsepass 0.12.0

pypi
falsepass package definition
{
  "version": "0.12.0",
  "transport": "stdio",
  "identifier": "falsepass",
  "registryType": "pypi",
  "packageArguments": [
    {
      "type": "positional",
      "value": "mcp"
    }
  ]
}

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.

This server is operated by the named third party. Listing and endpoint checks are not an endorsement or a security audit. Review the operator's permissions, terms, and data handling before connecting. How listings are checked and corrected.

Cursor

Merge this local stdio configuration, replace every placeholder environment value, and restart Cursor. Koskamo has not executed this package.
Cursor configuration
{
  "mcpServers": {
    "falsepass-mcp": {
      "command": "uvx",
      "args": [
        "falsepass==0.12.0",
        "mcp"
      ]
    }
  }
}

Cline

Merge this local stdio configuration, replace every placeholder environment value, and restart Cline. Koskamo has not executed this package.
Cline configuration
{
  "mcpServers": {
    "falsepass-mcp": {
      "command": "uvx",
      "args": [
        "falsepass==0.12.0",
        "mcp"
      ]
    }
  }
}

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": {
    "falsepass-mcp": {
      "type": "stdio",
      "command": "uvx",
      "args": [
        "falsepass==0.12.0",
        "mcp"
      ]
    }
  }
}

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": {
    "falsepass-mcp": {
      "command": "uvx",
      "args": [
        "falsepass==0.12.0",
        "mcp"
      ]
    }
  }
}

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