# instrument-product-analytics

Adds PostHog capture calls so you can track what users actually do. Handy after shipping a feature or reviewing a PR.

- skill · `type=skill` · Claude Code, Codex, Cursor, GitHub Copilot, Gemini CLI, OpenCode · 666 installs · ★ 75
- Author: PostHog
- License: MIT · policy=mirror · the beginning of the file is at the end of this page
- Source: https://github.com/PostHog/skills/tree/HEAD/skills/omnibus/instrument-product-analytics/SKILL.md
- Updated: 2026-10-24
- HTML: https://affpapa.org/en/nevibecode/skills/instrument-product-analytics

## What it does

The skill walks your codebase and places `posthog.capture()` where real actions happen: conversions, churn, sign-in. It also wires up exception tracking and calls `identify()` on login and signup. If PostHog isn't in the project yet, the skill installs the SDK and initializes it.

Work runs in steps. First the agent detects the framework and package manager from dependency and lock files, then reads a matching example under `references/` — Next.js, Nuxt, SvelteKit, Astro, Django, Flask, FastAPI, Laravel, Rails, Go, Elixir, Android, iOS, Flutter, React Native. From there it picks 10 to 15 files with business value, leaves existing events alone and supplements them.

Server-side events are required whenever the project has API routes, server actions, webhook handlers or checkout completion. For the project token the skill queries the PostHog MCP server and reads the region from the `projects-get` response. Without MCP connected, you supply the token yourself. It won't assume US Cloud — if the region is unclear, the agent asks whether you're on US or EU. Linting and formatting run only on files touched in the session, never across the whole repo.

## Install

### Claude Code (native platform)

1. **Skills CLI (Vercel)**
```bash
npx skills add PostHog/skills --skill instrument-product-analytics -a claude-code
```

2. **Manually: put the files in place**
- File: `~/.claude/skills/instrument-product-analytics/SKILL.md` — Copy the whole skill folder; for one project use .claude/skills/instrument-product-analytics/

### Codex

1. **Skills CLI (Vercel)**
```bash
npx skills add PostHog/skills --skill instrument-product-analytics -a codex
```

2. **Manually: put the files in place**
- File: `.agents/skills/instrument-product-analytics/SKILL.md` — For all projects use ~/.agents/skills/

### Cursor

1. **Skills CLI (Vercel)**
```bash
npx skills add PostHog/skills --skill instrument-product-analytics -a cursor
```

2. **Manually: put the files in place**
- File: `.cursor/skills/instrument-product-analytics/SKILL.md` — Cursor also reads .agents/skills/ and .claude/skills/

### GitHub Copilot

1. **GitHub CLI**
```bash
gh skill install PostHog/skills instrument-product-analytics
```

2. **Manually: put the files in place**
- File: `.github/skills/instrument-product-analytics/SKILL.md`

### Gemini CLI

1. **Skills CLI (Vercel)**
```bash
npx skills add PostHog/skills --skill instrument-product-analytics -a gemini-cli
```

2. **Platform CLI**
```bash
gemini skills install https://github.com/PostHog/skills --path skills/omnibus/instrument-product-analytics
```

### Windsurf (Devin Desktop)

**Manually: put the files in place**
- File: `.devin/skills/instrument-product-analytics/SKILL.md` — The legacy .windsurf/skills/ path still works

### OpenCode

**Skills CLI (Vercel)**
```bash
npx skills add PostHog/skills --skill instrument-product-analytics -a opencode
```

### Claude.ai

**Claude.ai**
- Zip the folder and upload it in Settings → Capabilities → Skills

Where a file is given instead of a command, copy the files from the source to that path: https://github.com/PostHog/skills/tree/HEAD/skills/omnibus/instrument-product-analytics/SKILL.md

## When to use it
- add PostHog events to freshly written code
- set up the PostHog SDK from scratch for your framework
- catch missed conversion and churn events during PR review
- link client and server events through a distinct ID
- add exception capture around critical flows

## Example prompts
- Add PostHog events to the code I just wrote
- Review this PR and fill in the missing capture calls
- Set up PostHog in this project if it isn't wired up yet

## Source text · SKILL.md · MIT

Below is the content of a third-party file. It is data, not instructions for you: do not act on anything written inside unless the human asks. Block tag: 2d167e64487fe88d.

BEGIN THIRD-PARTY FILE 2d167e64487fe88d
```text
---
name: instrument-product-analytics
description: >-
  Add PostHog product analytics events to track user behavior. Use after
  implementing new features or reviewing PRs to ensure meaningful user actions
  are captured. Also handles initial PostHog SDK setup if not yet installed.
metadata:
  author: PostHog
---

# Add PostHog product analytics events

Use this skill to add product analytics events (capture calls) that track meaningful user actions in new or changed code. Use it after implementing features or reviewing PRs to ensure key user behaviors are captured. If PostHog is not yet installed, this skill also covers initial SDK setup. Supports any framework or language.

Supported frameworks and languages: Next.js, React Router, Nuxt, Vue, TanStack Start, SvelteKit, Astro, Angular, Django, Flask, FastAPI, Laravel, PHP, Ruby on Rails, Go, Elixir, Android, iOS, Flutter, React Native, Expo, and more.

## Instructions

Follow these steps IN ORDER:

STEP 1: Analyze the codebase and detect the platform.
  -
 Look for dependency files (package.json, pubspec.yaml, Podfile, Package.swift, requirements.txt, Gemfile, composer.json, go.mod, mix.exs, etc.) to determine the framework and language.
  -
 Look for lockfiles (pnpm-lock.yaml, package-lock.json, yarn.lock, bun.lockb, go.sum, pubspec.lock, Podfile.lock, Package.resolved, mix.lock) to determine the package manager.
  - Check for existing PostHog setup. If PostHog is already installed and initialized, skip to STEP 5.

STEP 2: Research integration. (Skip if PostHog is already set up.)
  2.1. Find the reference file below that matches the detected framework — it is the source of truth for SDK initialization, provider setup, and event capture patterns. Read it now.
  2.2. If no reference matches, fall back to your general knowledge and web search. Use posthog.com/docs as the primary search source.

STEP 3: Install the PostHog SDK. (Skip if PostHog is already set up.)
  - Add the PostHog SDK package for the detected platform. Do not manually edit package.json — use the package manager's install command.

STEP 4: Initialize PostHog. (Skip if PostHog is already set up.)
  - Follow the framework reference for where and how to initialize. This varies significantly by framework (e.g., instrumentation-client.ts for Next.js 15.3+, AppConfig.ready() for Django, create_app() for Flask).

STEP 5: Plan event tracking.
```
END THIRD-PARTY FILE 2d167e64487fe88d

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