Fix a failing Worker request

Start with the instructions

Read the actual workers-best-practices SKILL.md ↗

cloudflare/skills · pinned e44f580f9c4fa3bf268e284ae7706c7954ba31fd

Instructions reviewed 2026-10-31. Publisher ownership and repository freshness are separate from this review and the example test.

Good for

• Writing and reviewing Cloudflare Workers
• Debugging request handling against a project’s installed runtime

Needs

• Worker source, project configuration and installed runtime versions
• Node.js and Wrangler for this local example

Limitations

• This example checks one request handler, not a production deployment
• Cloudflare access and deployment are separate steps

The input and actual output

Download the synthetic project and unchanged checks (ZIP). It contains no installed third-party skills. Install the pinned upstream skill separately after reviewing its license.

Before: GET /hello → 500
After:  GET /hello → 200
{"message":"Hello, friend!"}

Inspect the actual solution: src/index.js.

Checks performed

• Missing name, named, empty, whitespace and literal HTML inputs return expected JSON
• Unknown route returns 404; POST returns 405

Test receipt, installed-file hashes and source binding (JSON)

Repeat it in a clean project

Unzip the input into a new directory. Use Node 24 for the JavaScript examples or Python 3 for PDF. Install only the selected source skill at the pinned revision above. Open a fresh agent session and confirm its skill list contains the installed skill; ask it to read SKILL.md before changing the input.

1. npm ci
2. npm test # reproduce the failing request
3. Ask your agent to fix src/index.js only
4. npm test # all 7 checks must pass

Compare the independently checked output and hashes with the receipt. Different agent versions can produce different code; the unchanged checks define the sample’s expected behavior.

Try it with your agent

Edit the task, then use the existing guide for Codex or Claude. Copying a prompt does not install or run anything.

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