PostHog MCP Server

A Model Context Protocol (MCP) server for interacting with PostHog. Create annotations and manage projects directly through Claude Desktop!

Features

• List Projects: View all available PostHog projects in your organization
• Create Annotations: Add annotations to your PostHog projects with optional timestamps [this list can be much longer, anything our api has basically…]

Setup

1. Prerequisites

• Python 3.10 or higher
• uv package manager
• PostHog API Key with annotation:write and project:read scopes obtained from your project settings

1. Installation

   # clone the repo
   git clone git@github.com:PostHog/posthog-mcp.git

   # or if https, use: git clone https://github.com/PostHog/posthog-mcp.git

   cd posthog-mcp

   uv venv
   source .venv/bin/activate

   # Install dependencies
   uv pip install .

3. Configuration

• Create a .env file in the project root: PERSONAL_API_KEY=phx_your_posthog_api_key_here

3. Claude Desktop Setup

• Install Claude Desktop
• Open Claude Desktop settings and click "Edit Config". Alternatively, you can open the file from:
  • macOS: ~/Library/Application Support/Claude/claude_desktop_config.json
  • Windows: %APPDATA%\Claude\claude_desktop_config.json
• Add this to your claude_desktop_config.json (adjust paths according to your system): json { "mcpServers": { "posthog": { "command": "/path/to/uv", # Get this by running: which uv "args": [ "--directory", "/path/to/your/posthog-mcp", # Full path to this project "run", "posthog_mcp" ] } } } Check the latest documentation on setting up Claude Desktop as MCP client if you ran into any issues.

Usage

After setup, you'll see a hammer icon in Claude Desktop. The following commands are available:

List Projects

Ask Claude:

"List my PostHog projects"

Get and Search for Insights

Ask Claude:

"List my PostHog insights" or "Search for revenue insights in my PostHog"

Search for documentations online

You can ask:

• "how can i do reverse proxy in nextjs in posthog?"

Create Annotation

Using the Project ID you get from the list of projects, ask Claude:

"Create a PostHog annotation in project 53497 saying 'Deployed v1.2.3'"

or with a specific date:

"Create a PostHog annotation in project 53497 for March 20th saying 'Started new marketing campaign'"

Troubleshooting

• If the hammer icon doesn't appear, restart Claude Desktop
• Check logs at ~/Library/Logs/Claude/mcp*.log (macOS) or %APPDATA%\Claude\logs (Windows)
• Verify your PostHog API key has the correct permissions
• Make sure all paths in claude_desktop_config.json are absolute paths

Contributing

Feel free to open issues and PRs! We follow PostHog's contribution guidelines.