Omnibus Instrument Product Analytics

PostHogOfficialCreated by PostHog

Skill
Tool integration
Data and AI
MIT
Low risk

From the author

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.

— the description by PostHog

AutoGineer summary

Written by AutoGineer from the skill’s own files, not by the author

This skill provides a structured, step-by-step procedure for integrating PostHog product analytics into a wide variety of web, mobile, and backend frameworks. It handles the full lifecycle of the integration, from detecting the project's technology stack and installing the necessary SDKs to implementing event tracking, user identification, and error monitoring. The skill emphasizes non-intrusive changes, ensuring that new analytics code is added alongside existing logic without disrupting the project's architecture.

What it does

Detects the project framework and language to determine the correct PostHog SDK.
Installs the required PostHog SDK package automatically.
Initializes the PostHog instance according to framework-specific best practices.
Implements targeted event tracking for key user actions and business logic.
Configures user identification flows for login and signup events.
Sets up environment variables for secure API key and host management.

When to use it

After implementing new features that require tracking for user engagement analysis.
When reviewing pull requests to ensure critical user behaviors are being captured.
When setting up product analytics for a new project from scratch.
When migrating or adding analytics to an existing application.

Advantages

Supports a broad range of modern frontend, backend, and mobile frameworks.
Ensures consistent event naming and property capture across the codebase.
Maintains architectural integrity by requiring minimal, targeted code additions.
Automates the tedious aspects of SDK initialization and environment configuration.

Usage examples

“Add PostHog analytics to my Next.js project.”: The agent will detect the Next.js environment, install the PostHog SDK, initialize it in the appropriate root file, and guide you through adding capture calls to key user flows.
“I need to track user signups in my Django application using PostHog.”: The agent will identify the Django setup, configure the PostHog Python SDK, and implement identify calls within your authentication logic.

Install

Download the skill as a ZIP:
https://autogineer.com/agent-skills/posthog/omnibus-instrument-product-analytics/download

Unzip it into the cross-client skills folder of your project:

mkdir -p .agents/skills && unzip omnibus-instrument-product-analytics.zip -d .agents/skills

Documentation by 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: Next.js, React Router, Nuxt, Vue, TanStack Start, SvelteKit, Astro, Angular, Django, Flask, FastAPI, Laravel, Ruby on Rails, Android, iOS, 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, requirements.txt, Gemfile, composer.json, go.mod, etc.) to determine the framework and language.
Look for lockfiles (pnpm-lock.yaml, package-lock.json, yarn.lock, bun.lockb) 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.
Always install packages as a background task. Don't await completion; proceed with other work immediately after starting the installation.

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.

From the project's file list, select between 10 and 15 files that might have interesting business value for event tracking, especially conversion and churn events.
Also look for files related to login that could be used for identifying users, along with error handling.
Find any existing posthog.capture() code. Make note of event name formatting. Don't duplicate existing events; supplement them.
Track actions only, not pageviews (those can be captured automatically). Exceptions can be made for "viewed"-type events at the top of a conversion funnel.
Server-side events are REQUIRED if the project includes any instrumentable server-side code (API routes, server actions, webhook handlers, payment/checkout completion, authentication endpoints).

STEP 6: Implement event capture.

For each planned event, add posthog.capture() calls with useful properties.
If a file already has existing integration code for other tools or services, don't overwrite or remove that code. Place PostHog code below it.
Do not alter the fundamental architecture of existing files. Make additions minimal and targeted.
You must read a file immediately before attempting to write it.

STEP 7: Identify users.

Add PostHog identify() calls on the client side during login and signup events. Use the contents of login and signup forms to identify users on submit.
If both frontend and backend exist, pass the client-side session and distinct ID using X-POSTHOG-DISTINCT-ID and X-POSTHOG-SESSION-ID headers to the server-side code. On the server side, make sure events have a matching distinct ID.

STEP 8: Add error tracking.

Add PostHog exception capture error tracking to relevant files, particularly around critical user flows and API boundaries.

STEP 9: Set up environment variables.

If an env-file-tools MCP server is connected, use check_env_keys to see which keys already exist, then use set_env_values to create or update the PostHog API key and host.
Reference these environment variables in code instead of hardcoding them.

STEP 10: Verify and clean up.

Check the project for errors. Look for type checking or build scripts in package.json.
Ensure any components created were actually used.
Run any linter or prettier-like scripts found in the package.json.

Reference files

references/EXAMPLE-next-app-router.md - next-app-router example project code
references/EXAMPLE-next-pages-router.md - next-pages-router example project code
references/EXAMPLE-react-react-router-6.md - react-react-router-6 example project code
references/EXAMPLE-react-react-router-7-framework.md - react-react-router-7-framework example project code
references/EXAMPLE-react-react-router-7-data.md - react-react-router-7-data example project code
references/EXAMPLE-react-react-router-7-declarative.md - react-react-router-7-declarative example project code
references/EXAMPLE-nuxt-3.6.md - nuxt-3.6 example project code
references/EXAMPLE-nuxt-4.md - nuxt-4 example project code
references/EXAMPLE-vue-3.md - vue-3 example project code
references/EXAMPLE-react-tanstack-router-file-based.md - react-tanstack-router-file-based example project code
references/EXAMPLE-react-tanstack-router-code-based.md - react-tanstack-router-code-based example project code
references/EXAMPLE-tanstack-start.md - tanstack-start example project code
references/EXAMPLE-sveltekit.md - sveltekit example project code
references/EXAMPLE-astro-static.md - astro-static example project code
references/EXAMPLE-astro-view-transitions.md - astro-view-transitions example project code
references/EXAMPLE-astro-ssr.md - astro-ssr example project code
references/EXAMPLE-astro-hybrid.md - astro-hybrid example project code
references/EXAMPLE-angular.md - angular example project code
references/EXAMPLE-django.md - django example project code
references/EXAMPLE-flask.md - flask example project code
references/EXAMPLE-fastapi.md - fastapi example project code
references/EXAMPLE-python.md - python example project code
references/EXAMPLE-laravel.md - laravel example project code
references/EXAMPLE-ruby-on-rails.md - ruby-on-rails example project code
references/EXAMPLE-ruby.md - ruby example project code
references/EXAMPLE-android.md - android example project code
references/EXAMPLE-swift.md - swift example project code
references/EXAMPLE-react-native.md - react-native example project code
references/EXAMPLE-expo.md - expo example project code
references/next-js.md - Next.js - docs
references/react-router-v6.md - React router v6 - docs
references/react-router-v7-framework-mode.md - React router v7 framework mode (remix v3) - docs
references/react-router-v7-data-mode.md - React router v7 data mode - docs
references/react-router-v7-declarative-mode.md - React router v7 declarative mode - docs
references/nuxt-js-3-6.md - Nuxt.js (v3.0 to v3.6) - docs
references/nuxt-js.md - Nuxt.js - docs
references/vue-js.md - Vue.js - docs
references/tanstack-start.md - Tanstack start - docs
references/svelte.md - Svelte - docs
references/astro.md - Astro - docs
references/angular.md - Angular - docs
references/django.md - Django - docs
references/flask.md - Flask - docs
references/python.md - Python - docs
references/posthog-python.md - PostHog python SDK
references/laravel.md - Laravel - docs
references/ruby-on-rails.md - Ruby on rails - docs
references/ruby.md - Ruby - docs
references/android.md - Android - docs
references/ios.md - Ios - docs
references/react-native.md - React native - docs
references/identify-users.md - Identify users - docs

Each framework reference contains SDK-specific installation, initialization, and usage patterns. Find the one matching the user's stack.

Key principles

Environment variables: Always use environment variables for PostHog keys. Never hardcode them.
Minimal changes: Add PostHog code alongside existing integrations. Don't replace or restructure existing code.
Match the docs: Follow the framework reference's initialization and capture patterns exactly.

Files

ATTRIBUTION.mdAdded by AutoGineer966 B
LICENSELicence file added by AutoGineer1.0 KiB
SKILL.md8.5 KiB
references/EXAMPLE-android.md49.7 KiB
references/EXAMPLE-angular.md23.4 KiB
references/EXAMPLE-astro-hybrid.md26.8 KiB
references/EXAMPLE-astro-ssr.md26.7 KiB
references/EXAMPLE-astro-static.md19.4 KiB
references/EXAMPLE-astro-view-transitions.md23.1 KiB
references/EXAMPLE-django.md30.0 KiB
references/EXAMPLE-expo.md35.5 KiB
references/EXAMPLE-fastapi.md40.9 KiB
references/EXAMPLE-flask.md32.0 KiB
references/EXAMPLE-javascript-node.md9.0 KiB
references/EXAMPLE-javascript-web.md11.7 KiB
references/EXAMPLE-laravel.md59.5 KiB
references/EXAMPLE-next-app-router.md17.3 KiB
references/EXAMPLE-next-pages-router.md18.9 KiB
references/EXAMPLE-nuxt-3.6.md22.1 KiB
references/EXAMPLE-nuxt-4.md28.7 KiB
references/EXAMPLE-python.md11.6 KiB
references/EXAMPLE-react-native.md46.4 KiB
references/EXAMPLE-react-react-router-6.md13.5 KiB
references/EXAMPLE-react-react-router-7-data.md20.1 KiB
references/EXAMPLE-react-react-router-7-declarative.md15.0 KiB
references/EXAMPLE-react-react-router-7-framework.md32.2 KiB
references/EXAMPLE-react-tanstack-router-code-based.md19.2 KiB
references/EXAMPLE-react-tanstack-router-file-based.md18.0 KiB
references/EXAMPLE-react-vite.md12.4 KiB
references/EXAMPLE-ruby-on-rails.md37.6 KiB
references/EXAMPLE-ruby.md10.3 KiB
references/EXAMPLE-sveltekit.md18.4 KiB
references/EXAMPLE-swift.md18.6 KiB
references/EXAMPLE-tanstack-start.md28.4 KiB
references/EXAMPLE-vue-3.md17.9 KiB
references/android.md21.7 KiB
references/angular.md12.5 KiB
references/astro.md8.3 KiB
references/django.md6.7 KiB
references/flask.md2.9 KiB
references/identify-users.md8.1 KiB
references/ios.md5.4 KiB
references/js.md12.3 KiB
references/laravel.md2.1 KiB
references/next-js.md12.5 KiB
references/node.md28.8 KiB
references/nuxt-js-3-6.md6.6 KiB
references/nuxt-js.md7.2 KiB
references/posthog-js.md42.3 KiB
references/posthog-node.md23.4 KiB
references/posthog-python.md31.3 KiB
references/python.md31.1 KiB
references/react-native.md43.8 KiB
references/react-router-v6.md11.6 KiB
references/react-router-v7-data-mode.md11.4 KiB
references/react-router-v7-declarative-mode.md11.6 KiB
references/react-router-v7-framework-mode.md14.9 KiB
references/react.md18.5 KiB
references/ruby-on-rails.md10.6 KiB
references/ruby.md18.9 KiB
references/svelte.md7.2 KiB
references/tanstack-start.md5.1 KiB
references/vue-js.md9.1 KiB

references/angular.md

Angular - Docs

PostHog makes it easy to get data about traffic and usage of your Angular app. Integrating PostHog into your site enables analytics about user behavior, custom events capture, session recordings, feature flags, and more.

This guide walks you through integrating PostHog into your Angular app using the JavaScript Web SDK.

Installation

Install posthog-js using your package manager:

PostHog AI

npm

npm install --save posthog-js

Yarn

yarn add posthog-js

pnpm

pnpm add posthog-js

Bun

bun add posthog-js

Initialize the PostHog client

Generate environment files for your project with ng g environments. Configure the following environment variables:

posthogKey: Your project token from your project settings.
posthogHost: Your project's client API host. Usually https://us.i.posthog.com for US-based projects and https://eu.i.posthog.com for EU-based projects.

Angular v17+

For Angular v17 and above, you can set up PostHog as a singleton service. To do this, start by creating and injecting a PosthogService instance.

Create a service by running ng g service services/posthog. The service should look like this:

posthog.service.ts

PostHog AI

// src/app/services/posthog.service.ts
import { DestroyRef, Injectable, NgZone } from "@angular/core";
import posthog from "posthog-js";
import { environment } from "../../environments/environment";
import { Router } from "@angular/router";
@Injectable({ providedIn: "root" })
export class PosthogService {
  constructor(
    private ngZone: NgZone,
    private router: Router,
    private destroyRef: DestroyRef,
  ) {
    this.initPostHog();
  }
  private initPostHog() {
    this.ngZone.runOutsideAngular(() => {
      posthog.init(environment.posthogKey, {
        api_host: environment.posthogHost,
        defaults: '2026-01-30',
      });
    });
  }
}

The service is initialized outside of the Angular zone to reduce change detection cycles. This is important to avoid performance issues with session recording.

Then, inject the service in your app's root component app.component.ts. This will make sure PostHog is initialized before any other component is rendered.

app.component.ts

PostHog AI

// src/app/app.component.ts
import { Component } from "@angular/core";
import { RouterOutlet } from "@angular/router";
import { PosthogService } from "./services/posthog.service";
@Component({
  selector: "app-root",
  styleUrls: ["./app.component.scss"],
  template: `
    <router-outlet />`,
  imports: [RouterOutlet],
})
export class AppComponent {
  title = "angular-app";
  constructor(posthogService: PosthogService) {}
}

Angular v16 and below

In your src/main.ts, initialize PostHog using your project token and instance address. You can find both in your project settings.

main.ts

PostHog AI

// src/main.ts
import { bootstrapApplication } from '@angular/platform-browser';
import { appConfig } from './app/app.config';
import { AppComponent } from './app/app.component';
import { environment } from "./environments/environment";
import posthog from 'posthog-js'
posthog.init(environment.posthogKey, {
  api_host: environment.posthogHost,
  defaults: '2026-01-30'
})
bootstrapApplication(AppComponent, appConfig)
  .catch((err) => console.error(err));

Identifying users

Identifying users is required. Call posthog.identify('your-user-id') after login to link events to a known user. This is what connects frontend event captures, session replays, LLM traces, and error tracking to the same person — and lets backend events link back too.
See our guide on identifying users for how to set this up.

Note: If you're using Typescript, you might have some trouble getting your types to compile because we depend on rrweb but don't ship all of their types. To accommodate that, you'll need to add @rrweb/[email protected] and [email protected] as a dependency if you want your Angular compiler to typecheck correctly.
Given the nature of this library, you might need to completely clear your .npm cache to get this to work as expected. Make sure your clear your CI's cache as well.
In the rare case the versions above get out-of-date, you can check our JavaScript SDK's package.json to understand what's the exact version you need to depend on.

Set up a reverse proxy (recommended)

We recommend setting up a reverse proxy, so that events are less likely to be intercepted by tracking blockers.

We have our own managed reverse proxy service, which is free for all PostHog Cloud users, routes through our infrastructure, and makes setting up your proxy easy.

If you don't want to use our managed service then there are several other options for creating a reverse proxy, including using Cloudflare, AWS Cloudfront, and Vercel.

Grouping products in one project (recommended)

If you have multiple customer-facing products (e.g. a marketing website + mobile app + web app), it's best to install PostHog on them all and group them in one project.

This makes it possible to track users across their entire journey (e.g. from visiting your marketing website to signing up for your product), or how they use your product across multiple platforms.

Add IPs to Firewall/WAF allowlists (recommended)

For certain features like heatmaps, your Web Application Firewall (WAF) may be blocking PostHog’s requests to your site. Add these IP addresses to your WAF allowlist or rules to let PostHog access your site.

EU: 3.75.65.221, 18.197.246.42, 3.120.223.253

US: 44.205.89.55, 52.4.194.122, 44.208.188.173

These are public, stable IPs used by PostHog services (e.g., Celery tasks for snapshots).

Tracking pageviews

PostHog automatically tracks your pageviews by hooking up to the browser's navigator API as long as you initialize PostHog with the defaults config option set after 2026-01-30.

Capture custom events

To capture custom events, import posthog and call posthog.capture(). Below is an example of how to do this in a component:

app.component.ts

PostHog AI

import { Component } from '@angular/core';
import posthog from 'posthog-js'
@Component({
 // existing component code
})
export class AppComponent {
  handleClick() {
    posthog.capture(
      'home_button_clicked',
    )
  }
}

Session replay

Session replay uses change detection to record the DOM. This can clash with Angular's change detection.

The recorder tool attempts to detect when an Angular zone is present and avoid the clash but might not always succeed.

If you followed the installation instructions for Angular v17 and above, you don't need to do anything.
If you followed the installation instructions for Angular v16 and below and you see performance impact from recording in an Angular project, ensure that you use ngZone.runOutsideAngular.

posthog.service.ts

PostHog AI

import { Injectable } from '@angular/core';
import posthog from 'posthog-js'
@Injectable({ providedIn: 'root' })
export class PostHogSessionRecordingService {
  constructor(private ngZone: NgZone) {}
initPostHog() {
    this.ngZone.runOutsideAngular(() => {
      posthog.init(
        /* your config */
      )
    })
  }
}

Angular with SSR

To use PostHog with Angular server-side rendering (SSR), you need to:

Update the PostHog web JS client to only initialize on the client-side.
Initialize PostHog Node on the server-side.

1. Update the PostHog web JS client

Update your posthog.service.ts to restrict the initialization of the PostHog web JS client to the client-side. The web SDK uses methods that are not available on the server side, so we need to check if we're on the client side before initializing PostHog.

posthog.service.ts

PostHog AI

import { isPlatformBrowser } from "@angular/common";
import { PLATFORM_ID } from "@angular/core";
import { isPlatformBrowser } from "@angular/common";
import { PLATFORM_ID } from "@angular/core";
@Injectable({ providedIn: "root" })
export class PosthogService {
  constructor(
    private ngZone: NgZone,
    private router: Router,
    private destroyRef: DestroyRef,
    @Inject(PLATFORM_ID) private platformId: Object
  ) {
    // Only initialize PostHog in browser environment
    if (isPlatformBrowser(this.platformId)) {
      this.initPostHog(); //+
    }

2. Add server-side initialization

Angular SSR uses a server.ts file to handle requests. We can add any server-side initialization code to this file.

First, install the posthog-node package to run on the server side.

PostHog AI

npm

npm install posthog-node --save

Yarn

yarn add posthog-node

pnpm

pnpm add posthog-node

Bun

bun add posthog-node

Then, add the following code to the server.ts file:

server.ts

PostHog AI

// src/server.ts
import { environment } from './environments/environment';
import { PostHog } from 'posthog-node'
/**
 * Extract distinct ID from PostHog cookie
 */
function getDistinctIdFromCookie(cookieHeader: string | undefined): string | null {
  if (!cookieHeader) return null;
  const cookieMatch = cookieHeader.match(`ph_${environment.posthogKey}_posthog=([^;]+)`);
  if (cookieMatch) {
    try {
      const parsed = JSON.parse(decodeURIComponent(cookieMatch[1]));
      return parsed?.distinct_id || null;
    } catch (error) {
      console.error('Error parsing PostHog cookie:', error);
      return null;
    }
  }
  return null;
}
/**
 * Handle all other requests by rendering the Angular application.
 */
app.get('**', async (req, res, next) => {
  const { protocol, originalUrl, baseUrl, headers } = req;
  const distinctId = getDistinctIdFromCookie(headers.cookie);
  let isFeatureEnabled = false;
  const client = new PostHog(
      const client = new PostHog(
      environment.posthogKey,
      { host: environment.posthogHost }
  )
  )
  if (distinctId) {
    client.capture({
      distinctId: distinctId,
      event: 'test_ssr_event',
      properties: {
        message: 'Hello from Angular SSR!'
      }
    })
    isFeatureEnabled = await client.isFeatureEnabled(
      'your_feature_flag_key', distinctId) || false;
  }
  commonEngine
    .render({
      bootstrap,
      documentFilePath: indexHtml,
      url: `${protocol}://${headers.host}${originalUrl}`,
      publicPath: browserDistFolder,
      providers: [
        { provide: APP_BASE_HREF, useValue: baseUrl },
        { provide: 'FEATURE_FLAG_ENABLED', useValue: isFeatureEnabled }
      ],
    })
    .then((html) => res.send(html))
    .catch((err) => next(err));
  await client.shutdown()
});

This code does the following:

Extracts the distinct ID from the cookie header. This is set by the web JS client.
Captures an event on the server side.
Evaluates a feature flag on the server side. This can be passed as a provider to the Angular application.
Calls shutdown on the PostHog Node client to ensure all events are flushed.

Using PostHog in server-side code

Angular SSR does not allow Node.js code to be bundled into client-side components. Even though resolvers and other server-side code can be written along with client-side components, you cannot use PostHog Node in those components.

Next steps

For any technical questions for how to integrate specific PostHog features into Angular (such as feature flags, A/B testing, surveys, etc.), have a look at our JavaScript Web SDK docs.

Alternatively, the following tutorials can help you get started:

Community questions

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Requirements and compatibility

Works with: Claude Code, Claude apps, OpenAI Codex, GitHub Copilot, Cursor, Gemini CLI, Kiro, OpenCode, Goose, Amp, Roo Code, JetBrains Junie, Factory Droid, Devin (ex-Windsurf), Mistral Vibe, OpenHands, Letta

“Works with” means the tool reads the open Agent Skills format; a skill written for one tool may use features others lack.

Needs: Needs an MCP server, Needs an API key, Needs Python, Needs Node.js

Security

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Instructions that use the network

A static scan is not a guarantee. Skills are third-party content: review a skill before you let an agent use it.

Attribution and licence

Created by

PostHog

Publisher

PostHog (Official)

Source

PostHog/skills · skills/posthog/integration/skills/all · commit a5d30e7

Licence

MIT License (redistribution allowed)

LICENSE (added by AutoGineer from LICENSE)
ATTRIBUTION.md (written by AutoGineer)

Synced

2026-11-09

Also distributed in

PostHog/skills

AutoGineer is not affiliated with or endorsed by PostHog or PostHog.

Download ZIP

The ZIP holds the skill’s files, its licence files and an ATTRIBUTION.md. Download omnibus-instrument-product-analytics.zip

From the author

AutoGineer summary

What it does

When to use it

Advantages

Usage examples

Install

Documentation by PostHog

Add PostHog product analytics events

Instructions

Reference files

Key principles

Files

references/angular.md

Angular - Docs

Installation

npm

Yarn

pnpm

Bun

Initialize the PostHog client

Angular v17+

Angular v16 and below

Identifying users

Tracking pageviews

Capture custom events

Session replay

Angular with SSR

1. Update the PostHog web JS client

2. Add server-side initialization

npm

Yarn

pnpm

Bun

Next steps

Community questions

Was this page useful?

Requirements and compatibility

Security

Attribution and licence

Related skills

Claude API

Transformers

Open Notebook

Vision Sft

LLM Evaluation

Lora Qlora Recipes

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