See which routes and tests your agent's uncommitted change touches
He built LayerMap: it reads your uncommitted diff and lists the HTTP routes and existing tests that reach the changed code, so you know what an agent's edit might break.
Source
@Griffin_Liu on X · 2026-10-20
Written in our own words. Credit to the original author. Link checked 2026-10-20.
What they did
He built LayerMap: it reads your uncommitted diff and lists the HTTP routes and existing tests that reach the changed code, so you know what an agent's edit might break.
Result (as claimed)
Open source and fully local.
Tools they used
Cost: Claude Code: from $17/mo; OpenAI Codex: free plan, paid from $8/mo.
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 Claude Code, OpenAI Codex. 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: See which routes and tests your agent's uncommitted change touches What the original author did: He built LayerMap: it reads your uncommitted diff and lists the HTTP routes and existing tests that reach the changed code, so you know what an agent's edit might break. Reported result (as claimed by the author): Open source and fully local. Source: https://x.com/Griffin_Liu/status/2112437715421872216 Tools they used: Claude Code, OpenAI Codex 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: See which routes and tests your agent's uncommitted change touches What the original author did: He built LayerMap: it reads your uncommitted diff and lists the HTTP routes and existing tests that reach the changed code, so you know what an agent's edit might break. Reported result (as claimed by the author): Open source and fully local. Source: https://x.com/Griffin_Liu/status/2112437715421872216 Tools they used: Claude Code, OpenAI Codex 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: See which routes and tests your agent's uncommitted change touches What the original author did: He built LayerMap: it reads your uncommitted diff and lists the HTTP routes and existing tests that reach the changed code, so you know what an agent's edit might break. Reported result (as claimed by the author): Open source and fully local. Source: https://x.com/Griffin_Liu/status/2112437715421872216 Tools they used: Claude Code, OpenAI Codex 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 use Claude Code and Codex together · How to run multiple coding agents together · How to build AI agents for SEO and ads · How to vibe code an app with Claude Code
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