PostHog

Work with PostHog by fetching the latest documentation on-demand. Never rely on memorized PostHog APIs or configuration — always fetch current docs to ensure accuracy.

Documentation Entry Points

Area	URL
Docs home	https://posthog.com/docs
SDKs	https://posthog.com/docs/libraries
Frameworks	https://posthog.com/docs/frameworks
API reference	https://posthog.com/docs/api
Product Analytics	https://posthog.com/docs/product-analytics
Feature Flags	https://posthog.com/docs/feature-flags
Experiments	https://posthog.com/docs/experiments
Session Replay	https://posthog.com/docs/session-replay
Surveys	https://posthog.com/docs/surveys
Error Tracking	https://posthog.com/docs/error-tracking
Data Pipelines	https://posthog.com/docs/cdp
Data Warehouse	https://posthog.com/docs/data-warehouse
Web Analytics	https://posthog.com/docs/web-analytics
LLM Analytics	https://posthog.com/docs/llm-analytics
AI Engineering	https://posthog.com/docs/ai-engineering

Workflow

When a task involves PostHog, spawn a sub-agent (via the Task tool) to research the relevant documentation. This keeps the main context clean while the sub-agent fetches and distills only the information needed.

Sub-agent prompt template

Adapt this template based on what information is needed:

Research PostHog documentation to answer the following question:

<QUESTION or TASK DESCRIPTION>

Steps:
1. Fetch the relevant PostHog docs page using WebFetch. Start with the most specific entry point URL from this list:
   - Docs home: https://posthog.com/docs
   - SDKs: https://posthog.com/docs/libraries
   - Frameworks: https://posthog.com/docs/frameworks
   - API: https://posthog.com/docs/api
   - [include whichever entry point is most relevant]

2. Scan the fetched page for links to more specific sub-pages relevant to the question. Fetch those sub-pages as needed. Follow at most 2-3 levels deep.

3. Extract the specific information needed: API signatures, configuration options, code examples, setup instructions, etc.

4. Return a concise summary containing ONLY the information needed to complete the task. Include:
   - Exact code snippets or configuration
   - Any required package names and install commands
   - Key caveats or gotchas mentioned in the docs
   - Source URLs for the pages you referenced

When to spawn a sub-agent vs. fetch directly

• Spawn a sub-agent (default): When you need to explore docs across multiple pages, or when the answer might require following links from an index page to sub-pages. This avoids polluting your main context with raw documentation.
• Fetch directly (skip sub-agent): When you already know the exact URL for a specific docs page and just need to confirm one detail. Use WebFetch yourself in this case.

Example: Adding PostHog to a Next.js app

1. Spawn a sub-agent with prompt:

   Research PostHog documentation for how to integrate PostHog with a Next.js application.
   
   1. Fetch https://posthog.com/docs/frameworks and find the Next.js-specific page.
   2. Fetch that Next.js page and extract the full setup instructions.
   3. Also fetch https://posthog.com/docs/libraries to identify the correct JS/React SDK package.
   4. Return: package names, install commands, provider setup code, and any Next.js-specific configuration (App Router vs Pages Router).
   

2. Use the returned information to implement the integration.

Example: Setting up feature flags

1. Spawn a sub-agent with prompt:

   Research PostHog documentation for implementing feature flags.
   
   1. Fetch https://posthog.com/docs/feature-flags to get the overview.
   2. Follow links to the SDK-specific implementation guide for [JavaScript/React/Node/etc.].
   3. Return: how to check flags client-side and server-side, the API for flag evaluation, and any relevant code examples.
   

2. Use the returned information to implement feature flags.

Rules

• Never guess PostHog APIs — always fetch current docs. PostHog ships frequently and APIs evolve.
• Prefer SDK-specific docs over generic API docs when the user is working in a specific language/framework.
• Check the frameworks page (/docs/frameworks) when integrating into a specific framework — PostHog often has framework-specific setup guides.
• Include source URLs in your response so the user can reference the original docs.