Build a Chrome extension that grades your code with a fast model
A developer vibe-coded a Chrome extension that sends code to a fast "system 1" model (Mercury) through your own OpenRouter key and returns notes on approach, efficiency and code style.
Source
@burntflashlight on X · 2026-10-19
Written in our own words. Credit to the original author. Link checked 2026-10-22.
What they did
A developer vibe-coded a Chrome extension that sends code to a fast "system 1" model (Mercury) through your own OpenRouter key and returns notes on approach, efficiency and code style.
Result (as claimed)
Open-sourced on GitHub; runs on your own OpenRouter key.
Tools they used
Cost: OpenRouter: free plan, paid from Pay per token. Checked 2026-10-14.
Set it up
Pick a contained repo or task
Start on a branch or side project where mistakes are cheap.
Install and configure
Set up Chrome, OpenRouter, AI coding agent. Read what it can run on your machine and limit permissions where possible.
Run it on a real task
Give it a well-scoped issue and let it work. Review the diff like any pull request.
Add guardrails
Keep tests and CI in the loop, and never let an agent push to main or touch production secrets unattended.
Copy the full setup prompt
Paste into your agent and it will walk you through the setup, asking before anything that sends, posts or spends.
You are helping me set up this AI use case end to end in Claude Code. Goal: Build a Chrome extension that grades your code with a fast model What the original author did: A developer vibe-coded a Chrome extension that sends code to a fast "system 1" model (Mercury) through your own OpenRouter key and returns notes on approach, efficiency and code style. Reported result (as claimed by the author): Open-sourced on GitHub; runs on your own OpenRouter key. Source: https://x.com/burntflashlight/status/2112264836369518910 Tools they used: Chrome, OpenRouter, AI coding agent Category: Dev & ops Please: 1. Ask me 3 short questions about my situation (accounts I have, budget, what I want the output to look like). 2. Propose a step-by-step plan using these tools or cheaper alternatives, with the time and cost of each step. Use official pricing pages; say "check pricing" if unsure. 3. Then do the setup with me one step at a time, waiting for my OK before anything that sends messages, posts publicly, spends money or deletes data. 4. Finish with a checklist to run it again next time.
You are helping me set up this AI use case end to end in Codex. Goal: Build a Chrome extension that grades your code with a fast model What the original author did: A developer vibe-coded a Chrome extension that sends code to a fast "system 1" model (Mercury) through your own OpenRouter key and returns notes on approach, efficiency and code style. Reported result (as claimed by the author): Open-sourced on GitHub; runs on your own OpenRouter key. Source: https://x.com/burntflashlight/status/2112264836369518910 Tools they used: Chrome, OpenRouter, AI coding agent Category: Dev & ops Please: 1. Ask me 3 short questions about my situation (accounts I have, budget, what I want the output to look like). 2. Propose a step-by-step plan using these tools or cheaper alternatives, with the time and cost of each step. Use official pricing pages; say "check pricing" if unsure. 3. Then do the setup with me one step at a time, waiting for my OK before anything that sends messages, posts publicly, spends money or deletes data. 4. Finish with a checklist to run it again next time.
You are helping me set up this AI use case end to end in Grok Bot. Goal: Build a Chrome extension that grades your code with a fast model What the original author did: A developer vibe-coded a Chrome extension that sends code to a fast "system 1" model (Mercury) through your own OpenRouter key and returns notes on approach, efficiency and code style. Reported result (as claimed by the author): Open-sourced on GitHub; runs on your own OpenRouter key. Source: https://x.com/burntflashlight/status/2112264836369518910 Tools they used: Chrome, OpenRouter, AI coding agent Category: Dev & ops Please: 1. Ask me 3 short questions about my situation (accounts I have, budget, what I want the output to look like). 2. Propose a step-by-step plan using these tools or cheaper alternatives, with the time and cost of each step. Use official pricing pages; say "check pricing" if unsure. 3. Then do the setup with me one step at a time, waiting for my OK before anything that sends messages, posts publicly, spends money or deletes data. 4. Finish with a checklist to run it again next time.
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Guides for this use case
How to build a Chrome extension with AI · How to vibe code an app with Claude Code
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