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MCP server for PostHog — product analytics for AI assistants. Query events, persons, insights, da...
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MCP server for PostHog — product analytics for AI assistants. Query events, persons, insights, da...
Security Report
5.8
Moderate5.8Moderate RiskThis PostHog MCP server is well-structured with proper authentication, appropriate permission scoping for its analytics use case, and solid error handling. The API key is correctly required via environment variables and not hardcoded. Rate limiting is implemented responsibly. Minor code quality issues (broad error catching, input validation on properties parameter) are present but do not raise security concerns. Permissions align well with the server's data analytics purpose. Supply chain analysis found 2 known vulnerabilities in dependencies (0 critical, 2 high severity). Package verification found 1 issue.
3 files analyzed · 6 issues found
Security scores are indicators to help you make informed decisions, not guarantees. Always review permissions before connecting any MCP server.
Permissions Required
This plugin requests these system permissions. Most are normal for its category.
How to Install
Add this to your MCP configuration file:
{
"mcpServers": {
"io-github-friendlygeorge-posthog-mcp-server": {
"args": [
"-y",
"posthog-mcp-server"
],
"command": "npx"
}
}
}Documentation
View on GitHubFrom the project's GitHub README.
PostHog MCP Server
Connect AI assistants to PostHog — query events, persons, insights, dashboards, feature flags, cohorts, and experiments through the Model Context Protocol.
Works with Claude Desktop, Cursor, Windsurf, Cline, Continue, and any MCP-compatible client.
Features
| Tool | Description |
|---|---|
list_events | Query events with filters (event name, person, date range, properties) |
get_person | Get a person (user) by distinct_id — properties, creation date, event count |
list_persons | Search and list persons with pagination |
list_dashboards | List all dashboards — names, tags, widget counts |
get_dashboard | Get a specific dashboard with its insights and widgets |
execute_insight | Execute a saved insight (trend, funnel, etc.) and get results |
list_feature_flags | List all feature flags — key, active status, rollout percentage |
evaluate_feature_flag | Evaluate a flag for a specific user and get variant value |
list_cohorts | List cohorts — name, type (dynamic/static/SQL), person count |
list_experiments | List A/B tests — name, status, feature flag, dates |
get_experiment | Get experiment results with variant data and statistical significance |
list_actions | List custom event actions/definitions |
get_project_info | Get project name, ID, settings, and data region |
Quick Start
1. Get a PostHog API Key
Go to PostHog → Settings → Personal API Keys and create a key with read access.
Or visit: https://your-instance.posthog.com/settings/user-api-keys
2. Configure your MCP client
Claude Desktop — add to claude_desktop_config.json:
{
"mcpServers": {
"posthog": {
"command": "npx",
"args": ["-y", "posthog-mcp-server"],
"env": {
"POSTHOG_API_KEY": "phx_YOUR_API_KEY_HERE",
"POSTHOG_HOST": "https://us.i.posthog.com",
"POSTHOG_PROJECT": "YOUR_PROJECT_ID"
}
}
}
}
Cursor — add to MCP settings (.cursor/mcp.json):
{
"mcpServers": {
"posthog": {
"command": "npx",
"args": ["-y", "posthog-mcp-server"],
"env": {
"POSTHOG_API_KEY": "phx_YOUR_API_KEY_HERE",
"POSTHOG_HOST": "https://us.i.posthog.com",
"POSTHOG_PROJECT": "YOUR_PROJECT_ID"
}
}
}
}
3. Run manually (for testing)
# Clone and build
git clone https://github.com/friendlygeorge/posthog-mcp-server.git
cd posthog-mcp-server
npm install
npm run build
# Run
POSTHOG_API_KEY=phx_... POSTHOG_PROJECT=12345 node dist/index.js
Environment Variables
| Variable | Required | Default | Description |
|---|---|---|---|
POSTHOG_API_KEY | ✅ | — | Your PostHog personal API key (phx_...) |
POSTHOG_HOST | ❌ | https://us.i.posthog.com | PostHog instance URL (use https://eu.i.posthog.com for EU) |
POSTHOG_PROJECT | ❌ | "" | Default project ID. If empty, must be specified per-call. |
Self-hosted PostHog
If you run PostHog on your own infrastructure, set POSTHOG_HOST to your instance URL:
POSTHOG_HOST=https://posthog.yourcompany.com
Example Queries
Once configured, ask your AI assistant:
- "Show me the last 20 pageview events"
- "Who are the most active users this week?"
- "What's the status of our signup conversion experiment?"
- "Is the new-checkout-flow feature flag enabled for user abc123?"
- "Show me all active dashboards"
- "Execute insight 42 and show me the trend"
- "List all feature flags that are currently active"
- "How many people are in the 'Power Users' cohort?"
API Reference
This server wraps the PostHog REST API (v1). Full documentation:
- PostHog API docs: https://posthog.com/docs/api
- MCP protocol: https://modelcontextprotocol.io
- PostHog: https://posthog.com
Development
npm install
npm run dev # Build and run
npm run build # Build only
npm start # Run built output
License
MIT © Nova
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