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What you can do with Old Coder

A markdown skill for coding agents that makes them write a test plan before coding and produce an evidence report after, so a human reviews those documents instead of the code.

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AmazingAng/old-coder on GitHub

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What do you want to do?

4 use cases

  • Rerun the demo gauntlet to check the evidence yourself

    Run the full gauntlet on the included rate limiter and confirm the reported numbers.

    View prompt
    In the old-coder repo, go to demo-rate-limiter and run ./tools/gauntlet.sh after setting up .venv as the README describes. Report the test count, statement and branch coverage, and planted bugs caught, and state whether each matches evidence.md.

  • Build a feature in Claude Code with a spec you approve first

    Install Old Coder in Claude Code so the agent writes a test plan, waits for your yes, then ships with evidence.

    View prompt
    Using the old-coder skill in the <project-path> repo, implement <feature-description>. First write the SPEC with concrete must and must-not examples and stop for my approval. After coding, produce an EVIDENCE report listing each check as pass, fail, or unverified, and confirm it came from a fresh run.

  • Add the Old Coder workflow to Codex or Cursor rules

    Paste the Old Coder SKILL.md into AGENTS.md or a rules file so the agent follows the same gates.

    View prompt
    Read skills/old-coder/SKILL.md in the <project-path> repo and follow it for the task <task-description>. Write the SPEC first and wait for my approval, then produce an EVIDENCE report that labels any unverified check as unverified. Verify that references/gauntlet.md was read before the gauntlet ran.

  • Design and review an HTTP/JSON API against API gates

    Use the optional old-coder-api skill to check compatibility, auth, idempotency, pagination, and rate limits.

    View prompt
    Using the old-coder-api skill, review the API change described in <spec-file-or-endpoint> for compatibility, authorization, idempotency, pagination, rate-limit, and operability. Output each gate as pass, fail, or unverified and list the resulting SPEC constraints and gauntlet checks.

How to use Old Coder

  1. Check you have what it needs: Git and a terminal; Python 3 for the demo gauntlet; A coding agent such as Claude Code, Codex CLI, or Cursor.
  2. Open AmazingAng/old-coder on GitHub and read the README and license.
  3. Clone the repo and open it: git clone https://github.com/amazingang/old-coder then cd old-coder (inferred, check the README)
  4. Enter the demo folder: cd demo-rate-limiter
  5. Create the environment and install: python3 -m venv .venv && .venv/bin/pip install -r requirements-dev.txt -e .
  6. Run the whole report: ./tools/gauntlet.sh

These steps come from our top use case, Rerun the demo gauntlet to check the evidence yourself, which also has a copy-paste agent prompt.

Old Coder alternatives · Best AI repos for Software and DevOps

About this repo

Requirements

  • Git and a terminal
  • Python 3 for the demo gauntlet
  • A coding agent such as Claude Code, Codex CLI, or Cursor
  • Node.js with npx for the skills installer
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Questions about Old Coder

What is Old Coder?

A markdown skill for coding agents that makes them write a test plan before coding and produce an evidence report after, so a human reviews those documents instead of the code. It is an open-source project on GitHub: https://github.com/AmazingAng/old-coder.

Who is Old Coder for?

Developers and engineering leads who use coding agents on code they will not read line by line and need checkable proof that it works.

What can I do with Old Coder?

4 use cases so far, for example: Rerun the demo gauntlet to check the evidence yourself; Build a feature in Claude Code with a spec you approve first; Add the Old Coder workflow to Codex or Cursor rules. Each has steps and a copy-paste agent prompt.

What do I need to run Old Coder?

Git and a terminal; Python 3 for the demo gauntlet; A coding agent such as Claude Code, Codex CLI, or Cursor; Node.js with npx for the skills installer.

What are alternatives to Old Coder?

Other hot AI repos in Software and DevOps: Harness2, iFixAi, Orca, Diagram Design, AI Memory.

Is Old Coder safe to run?

Deduped does not own, audit or vouch for it. Read the README and license, run it on your own systems first and review every command before you run it.