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

• 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...]

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

2. 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
     

4. 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):

     {
       "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.

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

Ask Claude:

"List my PostHog projects"

Ask Claude:

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

You can ask:

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

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'"

• 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

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