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Old Coder

Old Coder is a plain-Markdown skill that guides coding agents through an evidence-first development workflow: the agent prepares a test plan before coding, runs checks selected for the task, and produces an evidence report for human review. The repository also includes a separate HTTP/JSON API design and review skill.

Explore the practical guide ↓

Independent OpenViST project profile, based on linked sources.

Old Coder — OpenViST project profile in Coding Agents.
OpenViST project illustration. See the linked sources for product details.
Understand the project

Practical overview

When it fits

Use Old Coder when you want an instruction-following coding agent to frame its work with a human-approved test plan and a post-work evidence report, especially when the check effort should scale with change risk.

Who it is for

  • Developers using instruction-following coding agents who want a defined test plan and evidence report around generated code.
  • Teams that want checks scaled to the risk of a change, including deeper testing for work involving money, logins, data or concurrency.
  • Developers reviewing HTTP/JSON API work who want the companion API skill's contract gates.

Documented uses

  • Have an agent define concrete expected and forbidden behavior before implementation.
  • Structure test-first implementation and run checks such as coverage, mutation testing and property-based tests.
  • Review a report of checks and results, including explicit disclosure of unverified work.
  • Add API-specific review gates for compatibility, authorization, idempotency, pagination, rate limits and operability.
Before you choose

Requirements & limits

The repository is public and identifies the project as MIT-licensed.

  • It is a Markdown skill rather than a standalone coding agent or testing service.
  • It is described as compatible with Claude Code, Codex CLI, Cursor, Aider and other agents that follow instructions.
  • The gauntlet's checks are selected according to task risk, with domain-specific layers available for some tasks.
  • Its evidence process cannot establish that a specification is complete or that the checks and their mappings are themselves sound.

Check current requirements in the official documentation. Source-based guidance does not mean OpenViST has run or independently tested this project.

Source-based practical guide

Install Old Coder as an agent skill

Add the Old Coder skill to an agent workflow using the documented installer or manual placement.

Before you start

  • A coding agent that follows instructions.
  • For the documented installer route, npx.

Steps

  1. Run the command below.

    Documented command
    npx skills add https://github.com/amazingang/old-coder --skill old-coder

  2. For Claude Code manual installation, copy the skill into a skills folder, such as ~/.claude/skills/ or /.claude/skills/.

  3. For other agents, add skills/old-coder/SKILL.md to the agent's AGENTS.md, rules file or system prompt, and keep the references/ directory alongside it.

Expected outcome

The agent has Old Coder's Markdown instructions available for its coding workflow; Claude Code users can invoke `/old-coder` or let it trigger on high-assurance requests.

Guide limitations

  • The README describes an instruction-following agent as a prerequisite.
  • Manual placement instructions vary by agent.
Documentation 1 ↗
Source-based practical guide

Install the API review companion

Add the separate old-coder-api skill for HTTP/JSON API design and review.

Before you start

  • A coding agent that follows instructions.
  • For the documented installer route, npx.

Steps

  1. Run the command below.

    Documented command
    npx skills add https://github.com/amazingang/old-coder --skill old-coder-api

  2. To install both skills together, run the command below.

    Documented command
    npx skills add https://github.com/amazingang/old-coder --skill old-coder --skill old-coder-api

Expected outcome

The API companion is available for compatibility, authorization, idempotency, pagination, rate-limit and operability gates.

Guide limitations

  • The companion focuses on HTTP/JSON API design and review.
  • When both skills apply, old-coder-api owns API contract decisions while old-coder owns workflow, approval and evidence.
Documentation 1 ↗
COMPARE OPTIONS

Compare options for AI coding assistance

These projects document a common task and share a project role. This is a source-based comparison, not an execution benchmark or a guarantee of interchangeability.

ProjectDocumented purposePlatformAccess and requirements
Old CoderHave an agent define concrete expected and forbidden behavior before implementation.CLIThe repository is public and identifies the project as MIT-licensed.
SpectraClarify requirements and compare approaches before proposing a change.CLI, DesktopThe README lists a macOS and Windows desktop app, and a Homebrew installation for macOS. The CLI is published through npm and requires Node.js 22.14 or newer.
Skills — michaelshimelesInstall reusable task-specific skills into a coding-agent setup.CLIThe repository README provides an npx installation command for most coding agents and describes automatic or explicit skill invocation in Claude Code.
Evidence and transparency

Sources & review

Official repository ↗
Source record details
Source availability
Active
Sources checked
13 October 2026
Original website title
AmazingAng/old-coder · Official homepage title · retained in its source language
How we review sourcesSuggest a correction