Koskamo

Gatekeeper MCP

A stdio MCP server that routes tool calls through the Runestone Gatekeeper policy engine for enforcement, human approval, and audit trails. It pins identity, role, and origin server-side to prevent escalation and fails closed on deny or malformed responses, protecting against accidental damage, prompt injection, exfiltration, and SSRF attacks.

Package and access

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

Gatekeeper MCP logo, by Runestone-LabsCommunity listingLocal stdioSource reviewed; not executedPublished by Runestone-Labs
You need:Install once globally, drop the settings.example.json snippet into ~/.claude/settings.json
Vendor documentation

What you can do with it

  • Route shell_exec, files_write, and http_request calls through policy enforcement
  • Require human approval for sensitive operations like Bash or WebFetch
  • Maintain an audit trail for all AI agent tool calls
  • Prevent agent escalation by pinning identity and role server-side

Source and maintenance

Community listingRegistry 0.1.2Apache-2.0
mcp-registry: io.github.Runestone-Labs/gatekeeper@0.1.2Source repository
Last repository push
Latest release
v0.6.1
Maintenance checked

Packages and installation

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

@runestone-labs/gatekeeper-mcp 0.1.2

npm
@runestone-labs/gatekeeper-mcp package definition
{
  "version": "0.1.2",
  "transport": "stdio",
  "identifier": "@runestone-labs/gatekeeper-mcp",
  "registryType": "npm",
  "registryBaseUrl": "https://registry.npmjs.org",
  "environmentVariables": [
    {
      "name": "GATEKEEPER_ROLE",
      "isRequired": true,
      "description": "Policy role this server presents to Gatekeeper for every call. Required."
    },
    {
      "name": "GATEKEEPER_URL",
      "description": "Base URL of the Gatekeeper server. Default http://127.0.0.1:3847."
    },
    {
      "name": "GATEKEEPER_AGENT_NAME",
      "description": "Agent name recorded in Gatekeeper audit logs. Default mcp-client."
    },
    {
      "name": "GATEKEEPER_RUN_ID",
      "description": "Optional run-correlation id so calls count toward one per-run budget."
    }
  ]
}

Tools

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

No tool definitions available.

Maintenance history

Public check and source-refresh events. Editorial and ownership records remain private.

  • · repository · passed · metadata changed · updated
  • · backfill · recorded · Pre-expansion baseline; unobserved rich metadata remains unknown

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": {
    "gatekeeper-mcp": {
      "command": "npx",
      "args": [
        "-y",
        "@runestone-labs/gatekeeper-mcp@0.1.2"
      ],
      "env": {
        "GATEKEEPER_ROLE": "<YOUR_GATEKEEPER_ROLE>",
        "GATEKEEPER_URL": "<YOUR_GATEKEEPER_URL>",
        "GATEKEEPER_AGENT_NAME": "<YOUR_GATEKEEPER_AGENT_NAME>",
        "GATEKEEPER_RUN_ID": "<YOUR_GATEKEEPER_RUN_ID>"
      }
    }
  }
}

Cline

Merge this local stdio configuration, replace every placeholder environment value, and restart Cline. Koskamo has not executed this package.
Cline configuration
{
  "mcpServers": {
    "gatekeeper-mcp": {
      "command": "npx",
      "args": [
        "-y",
        "@runestone-labs/gatekeeper-mcp@0.1.2"
      ],
      "env": {
        "GATEKEEPER_ROLE": "<YOUR_GATEKEEPER_ROLE>",
        "GATEKEEPER_URL": "<YOUR_GATEKEEPER_URL>",
        "GATEKEEPER_AGENT_NAME": "<YOUR_GATEKEEPER_AGENT_NAME>",
        "GATEKEEPER_RUN_ID": "<YOUR_GATEKEEPER_RUN_ID>"
      }
    }
  }
}

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": {
    "gatekeeper-mcp": {
      "type": "stdio",
      "command": "npx",
      "args": [
        "-y",
        "@runestone-labs/gatekeeper-mcp@0.1.2"
      ],
      "env": {
        "GATEKEEPER_ROLE": "<YOUR_GATEKEEPER_ROLE>",
        "GATEKEEPER_URL": "<YOUR_GATEKEEPER_URL>",
        "GATEKEEPER_AGENT_NAME": "<YOUR_GATEKEEPER_AGENT_NAME>",
        "GATEKEEPER_RUN_ID": "<YOUR_GATEKEEPER_RUN_ID>"
      }
    }
  }
}

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": {
    "gatekeeper-mcp": {
      "command": "npx",
      "args": [
        "-y",
        "@runestone-labs/gatekeeper-mcp@0.1.2"
      ],
      "env": {
        "GATEKEEPER_ROLE": "<YOUR_GATEKEEPER_ROLE>",
        "GATEKEEPER_URL": "<YOUR_GATEKEEPER_URL>",
        "GATEKEEPER_AGENT_NAME": "<YOUR_GATEKEEPER_AGENT_NAME>",
        "GATEKEEPER_RUN_ID": "<YOUR_GATEKEEPER_RUN_ID>"
      }
    }
  }
}

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