PostHog/mcp
If you are the rightful owner of mcp and would like to certify it and/or have it hosted online, please leave a comment on the right or send an email to henry@mcphub.com.
PostHog MCP is a server that allows integration with PostHog's API for managing feature flags, tracking errors, and more.
PostHog MCP
Documentation: https://posthog.com/docs/model-context-protocol
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
-
Obtain a personal API key using the MCP Server preset here.
-
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/mcp", // You can replace this with https://mcp.posthog.com/sse if your client does not support Streamable HTTP
"--header",
"Authorization:${POSTHOG_AUTH_HEADER}"
],
"env": {
"POSTHOG_AUTH_HEADER": "Bearer {INSERT_YOUR_PERSONAL_API_KEY_HERE}"
}
}
}
}
Example Prompts
- What feature flags do I have active?
- Add a new feature flag for our homepage redesign
- What are my most common errors?
Data residency
The MCP server is hosted on a Cloudflare worker, this can be located outside of the EU / US, so there is no gaurantee that the data will be processed solely within a specific region.
Using self-hosted instances
If you're using a self-hosted instance of PostHog, you can specify a custom base URL by adding the POSTHOG_BASE_URL environment variable when running the MCP server locally or on your own infrastructure, e.g. POSTHOG_BASE_URL=https://posthog.example.com
Development
To run the MCP server locally, run the following command:
pnpm run dev
And replace https://mcp.posthog.com/mcp with http://localhost:8787/mcp in the MCP configuration.
Project Structure
This repository is organized to support multiple language implementations:
typescript/- TypeScript implementation of the MCP server & toolsschema/- Shared schema files generated from TypeScript
Development Commands
pnpm run dev- Start development serverpnpm run schema:build:json- Generate JSON schema for other language implementationspnpm run lint:typescript- Format and lint code
Environment variables
- Create
.dev.varsin the root - Add Inkeep API key to enable
docs-searchtool (seeInkeep 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/mcp --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/mcp --header "Authorization: Bearer {INSERT_YOUR_PERSONAL_API_KEY_HERE}"
