Integration Astro View Transitions — Agent Skill by PostHog

From the author

PostHog integration for Astro with ClientRouter view transitions

— the description by PostHog

AutoGineer summary

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

This skill provides a structured approach to integrating PostHog analytics into Astro projects that utilize the ClientRouter for view transitions. It addresses common challenges such as preventing initialization stack overflows during soft navigation and ensuring accurate pageview tracking. The guide includes best practices for component-based initialization, environment variable management, and user identification patterns.

What it does

Provides a reusable PostHog initialization component for Astro
Implements an initialization guard to prevent stack overflow errors during soft navigation
Configures automatic pageview tracking for SPA-like transitions
Outlines patterns for identifying users and tracking custom events
Demonstrates how to capture exceptions and errors within the application
Guides the setup of environment variables for secure API key management

When to use it

When adding PostHog analytics to an Astro project using ClientRouter
When you need to ensure analytics persist correctly across soft page transitions
When you need to track user behavior, custom events, or errors in an Astro app
When you want to follow established patterns for Astro and PostHog integration

Advantages

Prevents common initialization errors associated with Astro's view transitions
Ensures consistent analytics data collection across client-side navigation
Promotes clean, modular code through component-based integration
Follows security best practices by using environment variables

Usage examples

“How do I initialize PostHog in my Astro project with View Transitions?”: The agent will guide you to create a posthog.astro component with an initialization guard and import it into your layout.
“How can I track pageviews automatically during soft navigation in Astro?”: The agent will instruct you to set the capture_pageview option to 'history_change' within your PostHog initialization script.

Install

Download the skill as a ZIP:
https://mp-staging.autogineer.com/agent-skills/posthog/integration-astro-view-transitions/download

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

mkdir -p .agents/skills && unzip integration-astro-view-transitions.zip -d .agents/skills

Documentation by PostHog

PostHog integration for Astro (View Transitions)

This skill helps you add PostHog analytics to Astro (View Transitions) applications.

Workflow

Follow these steps in order to complete the integration:

basic-integration-1.0-begin.md - PostHog Setup - Begin ← Start here
basic-integration-1.1-edit.md - PostHog Setup - Edit
basic-integration-1.2-revise.md - PostHog Setup - Revise
basic-integration-1.3-conclude.md - PostHog Setup - Conclusion

Reference files

references/EXAMPLE.md - Astro (View Transitions) example project code
references/astro.md - Astro - docs
references/identify-users.md - Identify users - docs
references/basic-integration-1.0-begin.md - PostHog setup - begin
references/basic-integration-1.1-edit.md - PostHog setup - edit
references/basic-integration-1.2-revise.md - PostHog setup - revise
references/basic-integration-1.3-conclude.md - PostHog setup - conclusion

The example project shows the target implementation pattern. Consult the documentation for API details.

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 example: Your implementation should follow the example project's patterns as closely as possible.

Framework guidelines

Always use the is:inline directive on PostHog script tags to prevent Astro from processing them and causing TypeScript errors
Use PUBLIC_ prefix for client-side environment variables in Astro (e.g., PUBLIC_POSTHOG_PROJECT_TOKEN)
Create a posthog.astro component in src/components/ for reusable initialization across pages
Import the PostHog component in a Layout and wrap all pages with that layout
Wrap PostHog initialization with a window.__posthog_initialized guard to prevent stack overflow during soft navigation
Set capture_pageview option to 'history_change' for automatic pageview tracking during soft navigation
Use the astro page-load event instead of just DOMContentLoaded to re-run scripts after soft navigation

Identifying users

Identify users during login and signup events. Refer to the example code and documentation for the correct identify pattern for this framework. If both frontend and backend code exist, pass the client-side session and distinct ID using X-POSTHOG-DISTINCT-ID and X-POSTHOG-SESSION-ID headers to maintain correlation.

Error tracking

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

Files

ATTRIBUTION.mdAdded by AutoGineer1002 B
LICENSELicence file added by AutoGineer1.0 KiB
SKILL.md2.8 KiB
references/EXAMPLE.md23.1 KiB
references/astro.md8.3 KiB
references/basic-integration-1.0-begin.md2.1 KiB
references/basic-integration-1.1-edit.md2.5 KiB
references/basic-integration-1.2-revise.md937 B
references/basic-integration-1.3-conclude.md1.6 KiB
references/identify-users.md8.1 KiB

references/basic-integration-1.1-edit.md

title: PostHog Setup - Edit description: Implement PostHog event tracking in the identified files, following best practices and the example project

For each of the files and events noted in .posthog-events.json, make edits to capture events using PostHog. Make sure to set up any helper files needed. Carefully examine the included example project code: your implementation should match it as closely as possible. Do not spawn subagents.

Use environment variables for PostHog keys. Do not hardcode PostHog keys.

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.

For each event, add useful properties, and use your access to the PostHog source code to ensure correctness. You also have access to documentation about creating new events with PostHog. Consider this documentation carefully and follow it closely before adding events. Your integration should be based on documented best practices. Carefully consider how the user project's framework version may impact the correct PostHog integration approach.

Remember that you can find the source code for any dependency in the node_modules directory. This may be necessary to properly populate property names. There are also example project code files available via the PostHog MCP; use these for reference.

Where possible, add calls for PostHog's identify() function on the client side upon events like logins and signups. Use the contents of login and signup forms to identify users on submit. If there is server-side code, pass the client-side session and distinct ID to the server-side code to identify the user. On the server side, make sure events have a matching distinct ID where relevant.

It's essential to do this in both client code and server code, so that user behavior from both domains is easy to correlate.

You should also add PostHog exception capture error tracking to these files where relevant.

Remember: Do not alter the fundamental architecture of existing files. Make your additions minimal and targeted.

Remember the documentation and example project resources you were provided at the beginning. Read them now.

Status

Status to report in this phase:

Inserting PostHog capture code
A status message for each file whose edits you are planning, including a high level summary of changes
A status message for each file you have edited

Upon completion, continue with: basic-integration-1.2-revise.md

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.

Security

No issues found by our static scan· No issues found

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

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Download ZIP

The ZIP holds the skill’s files, its licence files and an ATTRIBUTION.md. Download integration-astro-view-transitions.zip