PostHog AI plugin
Official PostHog plugin for AI clients. Access PostHog products directly from your AI coding tool.
Installation
Claude Code
-
Install the plugin:
claude plugin install posthog
-
Authenticate via OAuth:
# Just enter Claude Code anywhere
claude
# Then, use the /mcp command within Claude, select plugin:posthog:posthog, and press Enter
/mcp
Then follow the browser prompts to log into PostHog.
-
(Optional) Send Claude Code sessions to PostHog LLM Analytics.
Add to ~/.claude/settings.json (global) or .claude/settings.local.json (per-project):
{
"env": {
"POSTHOG_LLMA_CC_ENABLED": "true",
"POSTHOG_API_KEY": "phc_...",
"POSTHOG_HOST": "https://eu.i.posthog.com"
}
}
Both POSTHOG_LLMA_CC_ENABLED=true and POSTHOG_API_KEY are required. Sessions are sent when Claude Code exits. Set POSTHOG_LLMA_PRIVACY_MODE=true to redact prompt/output content. Add custom properties to all events with POSTHOG_LLMA_CUSTOM_PROPERTIES (JSON string, e.g. '{"ai_product": "my-app"}'). Set POSTHOG_AI_PURPOSE to declare what the session is doing relative to the repo — documented values are authoring and review, emitted as $ai_purpose. Useful when a harness wraps an agent it can't modify (e.g. a CI job running Claude Code as a reviewer); left unset the property is omitted.
Cursor
Install from the Cursor Marketplace or add manually in Cursor Settings > Plugins.
Codex
-
Add the marketplace:
codex plugin marketplace add PostHog/ai-plugin
-
Install the plugin from inside Codex:
codex
# Then run /plugins, select PostHog, and install
/plugins
Gemini CLI
gemini extensions install https://github.com/PostHog/ai-plugin
Grok
-
Install the plugin:
grok plugin install PostHog/ai-plugin --trust
-
Authenticate via OAuth:
On first use of a PostHog tool, Grok prompts you to authorize in your browser. Log into PostHog to connect.
How to develop
-
Clone and install the plugin:
git clone https://github.com/PostHog/ai-plugin
claude --plugin-dir ./ai-plugin
-
Authenticate via OAuth:
/mcp
Then follow the browser prompts to log into PostHog.
Features
This plugin provides access to 27+ PostHog tools across these categories:
- Feature flags - Create, update, and manage feature flags
- Experiments - Run and analyze A/B tests
- Insights - Query analytics and create visualizations
- Dashboards - Manage dashboards and add insights
- Error tracking - View and debug errors
- LLM analytics - Track AI/LLM costs and usage
- Documentation - Search PostHog docs
- And more
Bundled skills
The plugin also ships 30+ task-specific skills that your AI client loads on demand to follow PostHog best practices — covering HogQL query patterns, experiment creation and lifecycle, feature flags, data warehouse setup and troubleshooting, LLM analytics exploration, session replay diagnostics, and SDK instrumentation. Skills activate automatically when their description matches your request (e.g. "create an experiment", "why isn't my Stripe sync working?", "audit my feature flags"), so you generally don't need to invoke them by name.
Example usage
> What feature flags do I have?
> Create a feature flag called new-onboarding for 50% of users
> Show me errors from the last 24 hours
> Which errors are affecting the most users?
> How many users signed up this week?
> What's the conversion rate for the checkout funnel?
> Show me all my experiments
> What are the results of the checkout-flow experiment?
> Create a new dashboard called Product Metrics
> Add the signup funnel insight to the Growth dashboard
> What are the responses to the NPS survey?
> Create a feedback survey for the checkout page
> What's my most triggered event?
> Show me the top 10 pages by pageviews
Self-hosted
For self-hosted PostHog instances, set the POSTHOG_MCP_URL environment variable to point to your instance:
export POSTHOG_MCP_URL="https://mcp.your-posthog-instance.com/mcp"
Documentation
License
MIT
@posthog