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LaunchDarkly MCP Server

LaunchDarkly local MCP server

LaunchDarkly's official local MCP server: feature flags, AI Configs, environments and the audit log

MCP serverHigh risk

launchdarkly/mcp-serverAuthor: LaunchDarkly

Install

{
  "mcpServers": {
    "LaunchDarkly": {
      "command": "npx",
      "args": [
        "-y", "--package", "@launchdarkly/mcp-server", "--", "mcp", "start",
        "--api-key", "api-xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx"
      ]
    }
  }
}

The same config works for Cursor (.cursor/mcp.json) and Copilot CLI.

This is third-party code. Review the repository files before installing.

What it does

The server lets the agent work with LaunchDarkly feature flags. The agent creates, updates and deletes flags and checks their status across environments. It also manages AI Configs and their variations with targeting, reads the audit log, project environments and repositories with code references. It runs via npx, as a standalone binary or in Docker.

Who it is for. For LaunchDarkly teams on EU or Federal instances where the hosted server is not yet available.

Good fit when

  • You need a flag for a new feature straight from the editor
  • You want to check a flag's state across environments
  • You need the audit log to see who changed a flag and when

Not a fit when

  • Your account is on the commercial instance: the vendor recommends the hosted server
  • Flags live in another service

Example request

Create a new-checkout flag in the web project and show its status in every environment

Limitations

The vendor keeps the local server for EU and Federal instances; the hosted server gets more features and updates. Requires a LaunchDarkly API key, passed as a command-line argument in the README. The code is generated, so manual changes are not accepted. Access from Russia without a VPN is not verified.

How to disable. Remove the LaunchDarkly block from the MCP config and revoke the API key on the LaunchDarkly Authorization page.

MCP

Transport
stdio, sse
Authentication
API key

Security check

  • Changes and deletes flags that affect production immediately
  • The API key is stored in the client config

README in short

The README warns up front that the hosted server is preferred and the local one is for EU and Federal. It gives configs for Cursor, Claude Desktop, Qodo Gen and GitHub Copilot CLI, plus binary, clone and Docker runs. It lists available resources and region URLs. MIT licensed.

FAQ

How do I connect to EU or Federal?

Pass --server-url https://app.eu.launchdarkly.com or https://app.launchdarkly.us at startup.

Can I keep the key out of the config?

In clients that read environment variables you can pass it via a variable; the README has an example.

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