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Available in the Chrome Web Store

Chrome Extension · Handoff Layer

Turn PageSpeed Insights into coding-agent-ready Markdown.

Available in the Chrome Web Store

PageSpeed gives you the diagnosis.
Lighthouse Handoff turns it into a structured handoff — priorities, tasks, guardrails, and acceptance criteria.

Not another dashboard.
A handoff layer.

Add to Chrome View GitHub repo View roadmap

01 / Problem

The score is not the hard part.
The handoff is.

PageSpeed tells you what failed — not what to do first, what to avoid, or how to hand the work to a developer or coding agent.

PageSpeed

  • Scores
  • Audits
  • Diagnostics
  • Opportunities

Translation Gap

  • What matters?
  • What should happen first?
  • What is risky?
  • What should a coding agent actually do?

Lighthouse Handoff

  • Priority fixes
  • Developer tasks
  • Guardrails
  • Acceptance criteria
  • Testing checklist

02 / Workflow

How it works

  1. 01

    PageSpeed

    Run PageSpeed Insights on the page you want to improve.

  2. 02

    Issue Extraction

    Reads Lighthouse audits, opportunities, and diagnostics.

  3. 03

    Markdown Builder

    Findings become a developer-friendly Markdown report.

  4. 04

    Agent-Ready Handoff

    Priorities, tasks, guardrails, and acceptance criteria included.

  5. 05

    Developer Workflow

    Paste into Cursor, your IDE, or any coding agent and start fixing.

03 / Output

Example output

Structured Markdown you can paste into Cursor or hand to any coding agent.

pagespeed-handoff-example.md 
# Lighthouse Handoff

## Score Summary
- Performance: 58
- Accessibility: 91
- Best Practices: 83
- SEO: 92

## Priority Fixes
1. Eliminate render-blocking resources (estimated savings: 1.2s)
2. Properly size images (estimated savings: 840 KiB)
3. Reduce unused JavaScript (estimated savings: 420 KiB)
4. Add explicit width and height to image elements
5. Improve Largest Contentful Paint element handling

## Developer Tasks
- Audit blocking CSS and JS in the document head; inline critical CSS or defer non-critical stylesheets.
- Convert hero and above-the-fold images to responsive WebP/AVIF with appropriate `srcset`.
- Split or lazy-load JavaScript bundles that are not required for initial render.
- Add `width` and `height` attributes to `` tags to prevent layout shift.
- Identify the LCP element and ensure it is not lazy-loaded; preload if necessary.

## Guardrails
- Do not remove analytics or consent scripts without confirming business requirements.
- Preserve existing visual design and brand typography during image optimization.
- Avoid breaking third-party embeds when deferring scripts.
- Test on mobile viewport — most PageSpeed issues surface on slow 4G profiles.

## Acceptance Criteria
- Performance score improves by at least 10 points after changes.
- Largest Contentful Paint drops below 2.5s on mobile.
- Cumulative Layout Shift remains below 0.1.
- No visual regressions on primary landing page above the fold.
- All critical user flows (navigation, forms, checkout) remain functional.

## Testing Checklist
- [ ] Re-run PageSpeed Insights after deployment
- [ ] Verify LCP element loads within target on throttled mobile
- [ ] Check layout stability during page load (CLS)
- [ ] Confirm no broken images or missing styles
- [ ] Smoke-test key user paths on real devices

Example only. Actual reports depend on the analyzed page and available Lighthouse data.

Test the handoff

04 / Experiment

Without AI: useful report.
With Local AI: better handoff.

The core extension works without AI. Local AI is being tested to improve grouping, prioritization, and handoff quality.

The goal is not to build another chatbot.

The goal is to test one narrow question:
Can a small local model make the handoff better?

Standard Report

  • Deterministic
  • Fast
  • No model required
  • Works today
  • Structured from available Lighthouse data

Local AI Version

  • Better grouping
  • Priority clarification
  • Root-cause suggestions
  • Cleaner prompts
  • Risk awareness
  • Improved developer handoff language

05 / Roadmap

Roadmap

Progress
40%

  4. Collecting feedback on whether the handoff is useful for coding agent workflows.

    Test the handoff

07 / FAQ

FAQ

Does it fix my website?
No. It creates a structured handoff so a developer or coding agent can work from it.
Does it require AI?
No. The standard report works without AI.
What does Local AI do?
It is being tested to improve grouping, prioritization, root-cause suggestions, and handoff quality.
Who is it for?
Developers, builders, site owners, and people using coding agents or AI-assisted workflows.
Is this another dashboard?
No. It is a handoff layer between PageSpeed data and developer action.