# Old Coder API (agent skill)

> Old Coder API is an agent skill (a SKILL.md file) from AmazingAng/old-coder. Design, change, or review an HTTP/JSON API surface — endpoints, request/response shapes, authentication and authorization, pagination, idempotency, rate limits, versioning, and deprecations. It works with Claude Code, Codex and Cursor and has 749 GitHub stars.

Design, change, or review an HTTP/JSON API surface — endpoints, request/response shapes, authentication and authorization, pagination, idempotency, rate limits, versioning, and deprecations. Use when adding or modifying an HTTP endpoint, reviewing an OpenAPI spec or HTTP route diff, or deciding whether an HTTP API change breaks consumers. Do not use as a protocol-compatibility checklist for gRPC/protobuf, GraphQL, WebSockets, or other non-HTTP/JSON interfaces.

## Key facts

| Fact | Value |
|---|---|
| Repository | https://github.com/AmazingAng/old-coder |
| Skill path | skills/old-coder-api/SKILL.md |
| Skill name | old-coder-api |
| GitHub stars | 749 |
| Installs on skills.sh | not listed |
| License | MIT |
| Skills in repo | 1 |
| Plugin marketplace | no |
| Official | no |
| Works with | Claude Code, Codex, Cursor |
| Category | Security |
| Last commit | Aug 18, 2026 |

## When it triggers

- Use when adding or modifying an HTTP endpoint, reviewing an OpenAPI spec or HTTP route diff, or deciding whether an HTTP API change breaks consumers.
- use as a protocol-compatibility checklist for gRPC/protobuf, GraphQL, WebSockets, or other non-HTTP/JSON interfaces.

## Add this skill

### Claude Code

```sh
git clone --depth 1 https://github.com/AmazingAng/old-coder.git
cp -r old-coder/skills/old-coder-api ~/.claude/skills/old-coder-api   # personal, or .claude/skills in a project
```

In the Claude apps, zip the skill folder and upload it under Customize > Skills > + > Upload a skill (code execution must be on).

### ChatGPT / Codex

```sh
git clone --depth 1 https://github.com/AmazingAng/old-coder.git
cp -r old-coder/skills/old-coder-api .agents/skills/old-coder-api   # repo; ~/.agents/skills for all projects
```

### Cursor

```sh
git clone --depth 1 https://github.com/AmazingAng/old-coder.git
cp -r old-coder/skills/old-coder-api .cursor/skills/old-coder-api   # project; ~/.cursor/skills for all projects
```

Sources (checked 2026-10-07): https://code.claude.com/docs/en/skills, https://support.claude.com/en/articles/12512180-using-skills-in-claude, https://learn.chatgpt.com/docs/build-skills, https://cursor.com/docs/context/skills

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Canonical page: https://appsgit.com/skills/amazingang-old-coder-api
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