APIs fail in specific, testable ways: wrong status codes, schema drift, missing auth checks, sloppy validation, unhelpful errors. This skill plans the tests that catch them — per endpoint, across the response codes and the error paths, with contract checks so the API keeps its promises to clients. It tests the whole behaviour, not just the happy 200.
API Test Plan is a community-contributed Claude Code skill in the testing sub-category. It ships as a SKILL.md file that Claude Code auto-discovers under ~/.claude/skills/api-test-plan/ and loads when your prompt matches the skill's trigger.
When to invoke it: Use when asked to test an API, write API test cases, plan REST/GraphQL endpoint testing, or validate an API contract. Produces an API test plan — per-endpoint cases (status codes, schema, auth, validation, errors), boundary/negative cases, contract checks, and non-functional notes — so the API is verified beyond the happy 200.
The API Test Plan Claude Code skill is built for software engineers, backend developers, full-stack teams, and technical leads building and maintaining production systems. It's part of ClaudSkills (also referred to as Claude Skills or Claude Code Skills) — the open community-curated registry of 158,000+ SKILL.md files for Anthropic's Claude Code agent and the wider Claude ecosystem (Claude API, Claude Agent SDK).
mkdir -p ~/.claude/skills/api-test-plan curl -L https://claudskills.com/skills/api-test-plan/SKILL.md \ -o ~/.claude/skills/api-test-plan/SKILL.md
Or just download SKILL.md directly and drop it into ~/.claude/skills/api-test-plan/. Claude Code auto-discovers it on next session.
Skills live at ~/.claude/skills/api-test-plan/SKILL.md on macOS/Linux, or %USERPROFILE%\.claude\skills\api-test-plan\SKILL.md on Windows. See the full install guide for step-by-step instructions.
Open @claudskills_bot on Telegram, tap Open Desktop App, and the desktop app installs this skill for you. Or share the bot link with a colleague — they get the same one-tap install. Learn more →
The ClaudSkills desktop app installs any skill directly into ~/.claude/skills/ with one click — no terminal required. Pro starts at $9/mo or $149 lifetime.
For the full experience including quality scoring and one-click install features for each skill — upgrade to Pro.
SKILL.md from the source repository to ~/.claude/skills/api-test-plan/SKILL.md and restart Claude Code. Both flows are detailed at claudskills.com/install/.SKILL.md file that lives under ~/.claude/skills/<name>/ and tells the Claude Code CLI agent how to perform a specific task (instructions, prompts, allowed tools). Skills are auto-discovered at session start. API Test Plan is one of 67,000+ skills indexed in the open ClaudSkills catalog, classified under the Engineering category. Learn more at /learn/what-is-a-claude-skill/.If you reference this skill in a blog post, paper, or documentation, you can cite it as:
@misc{api-test-plan-2026,
author = {mohitagw15856},
title = {API Test Plan [Claude Code skill]},
year = {2026},
publisher = {ClaudSkills},
url = {https://claudskills.com/skills/api-test-plan/}
}Grade A · scanned 2026-07-23 — free static scan against the OWASP Agentic Skills Top 10.
No risk patterns were found in any of the ten OWASP-aligned categories. How grading works ›
Browse all Engineering skills in the ClaudSkills registry, or explore these other picks from the same category:
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SKILL.md files, not affiliated with, endorsed by, or sponsored by Anthropic.