PostHog MCP

Use the MCP Server

Quick install

You can install the MCP server automatically into popular clients by running the following command:

npx @posthog/wizard@latest mcp add

Manual install

1. Obtain a personal API key using the MCP Server preset here.

2. Add the MCP configuration to your desktop client (e.g. Cursor, Windsurf, Claude Desktop) and add your personal API key

{
  "mcpServers": {
    "posthog": {
      "command": "npx",
      "args": [
        "-y",
        "mcp-remote@latest",
        "https://mcp.posthog.com/sse",
        "--header",
        "Authorization:${POSTHOG_AUTH_HEADER}"
      ],
      "env": {
        "POSTHOG_AUTH_HEADER": "Bearer {INSERT_YOUR_PERSONAL_API_KEY_HERE}"
      }
    }
  }
}

Here are some examples of prompts you can use:

• What feature flags do I have active?
• Add a new feature flag for our homepage redesign
• What are my most common errors?

Development

To run the MCP server locally, run the following command:

pnpm run dev

And replace https://mcp.posthog.com/sse with http://localhost:8787/sse in the MCP configuration.

Environment variables

• Create .dev.vars in the root
• Add Inkeep API key to enable docs-search tool (see Inkeep API key - mcp)

INKEEP_API_KEY="..."

Configuring the Model Context Protocol Inspector

During development you can directly inspect the MCP tool call results using the MCP Inspector.

You can run it using the following command:

npx @modelcontextprotocol/inspector npx -y mcp-remote@latest http://localhost:8787/sse --header "\"Authorization: Bearer {INSERT_YOUR_PERSONAL_API_KEY_HERE}\""

Alternatively, you can use the following configuration in the MCP Inspector:

Use transport type STDIO.

Command:

npx

Arguments:

-y mcp-remote@latest http://localhost:8787/sse --header "Authorization: Bearer {INSERT_YOUR_PERSONAL_API_KEY_HERE}"