ConfigCat MCP Server for Claude

Overview

The ConfigCat MCP Server is the official Model Context Protocol server from ConfigCat, providing 52 tools for the full ConfigCat Management API. It lets Claude manage feature flags, targeting rules, environments, segments, webhooks, and SDK keys in natural language — including a dedicated list-staleflags tool for finding zombie flags stuck at 100% rollout that are ready for cleanup. Licensed under MIT.

Key capabilities

• Feature flags — create, read, update, delete flags and their targeting rules.
• Flag values — get and set flag values per environment.
• Environments — list, create, and update environment configurations.
• Segments — manage user segment definitions for targeted rollouts.
• Stale flag detection — identify zombie/unused flags with list-staleflags.
• Audit logs — retrieve change history at product and organization level.
• SDK keys — retrieve SDK keys per environment.
• Webhooks — create webhooks and retrieve signing keys.
• Organization management — invite members, manage permissions.

Tools (52 total, key selection)

Credentials

ConfigCat uses Management API credentials (not SDK keys) for the MCP server. Generate them at:

My Account → Public API Credentials → + Create new credentials

These credentials use HTTP Basic auth (CONFIGCAT_API_USER / CONFIGCAT_API_PASS) and grant access to the Management API — distinct from SDK keys used in application code.

How it compares

ConfigCat's list-staleflags tool for zombie flag detection has no equivalent in other feature flag MCP servers.

Installation

Claude Code

claude mcp add configcat \
  -e CONFIGCAT_API_USER=<your-api-user> \
  -e CONFIGCAT_API_PASS=<your-api-pass> \
  -- npx -y @configcat/mcp-server

Claude Desktop

{
  "mcpServers": {
    "configcat": {
      "command": "npx",
      "args": ["-y", "@configcat/mcp-server"],
      "env": {
        "CONFIGCAT_API_USER": "<your-api-user>",
        "CONFIGCAT_API_PASS": "<your-api-pass>"
      }
    }
  }
}

Requirements

• A ConfigCat account with Management API credentials.
• Node.js (for npx).
• An MCP client (Claude Code or Claude Desktop).

Security

• Management API credentials (API_USER/API_PASS) grant full account access — keep them in the MCP config env and never commit to version control.
• SDK keys are separate from Management API credentials; the MCP server does not expose live user traffic data.

Source Verification Notes

Verified on 2026-06-18:

• Official repository configcat/mcp-server (MIT) on npm as @configcat/mcp-server documents all 52 tools, CONFIGCAT_API_USER/CONFIGCAT_API_PASS management credentials, the default CONFIGCAT_BASE_URL, and the list-staleflags capability.
• ConfigCat documentation at configcat.com/docs/advanced/mcp-server/ describes the integration setup and credential generation process.
• Claude Code MCP documentation at code.claude.com/docs/en/mcp describes the stdio connector pattern used above.