Use Yaak
mountain-loop/yaak
A skill your agent uses when the user mentions Yaak, a Yaak workspace, or the yaak command, or asks to call, hit, or smoke test HTTP/REST endpoints, save or organize API requests for reuse or manual…
Plan tests for an API endpoint or service — functional, negative, and contract.
Install API Test Plan
$ npx skills add mohitagw15856/pm-claude-skills --skill api-test-plan -a claude-codeProject install by default; add -g for ~/.claude/skills/.
$ gh skill install mohitagw15856/pm-claude-skills api-test-plan --agent claude-codeProject scope by default; add --scope user for a personal install. Needs GitHub CLI 2.90.0 or later (public preview).
$ git clone --depth 1 https://github.com/mohitagw15856/pm-claude-skills.git skills-src && mkdir -p .claude/skills && cp -r skills-src/skills/api-test-plan .claude/skills/api-test-plan && rm -rf skills-srcUse ~/.claude/skills/ instead of .claude/skills for a personal install. The folder must contain SKILL.md.
Claude Code skills documentation · loads skills from .claude/skills/
Install the "api-test-plan" agent skill from https://github.com/mohitagw15856/pm-claude-skills/tree/main/skills/api-test-plan into .claude/skills/api-test-plan/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "api-test-plan", then confirm the skill loads.Claude Code copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
$skill-installer install https://github.com/mohitagw15856/pm-claude-skills/tree/main/skills/api-test-planType this inside Codex. $skill-installer <name> installs a curated skill from openai/skills. The installer writes to $CODEX_HOME/skills (default ~/.codex/skills). Restart Codex if the skill does not show up.
$ npx skills add mohitagw15856/pm-claude-skills --skill api-test-plan -a codexProject install goes to .agents/skills/; add -g for ~/.codex/skills/.
$ gh skill install mohitagw15856/pm-claude-skills api-test-plan --agent codexProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/mohitagw15856/pm-claude-skills.git skills-src && mkdir -p .agents/skills && cp -r skills-src/skills/api-test-plan .agents/skills/api-test-plan && rm -rf skills-srcUse ~/.agents/skills/ instead of .agents/skills for a personal install.
Codex skills documentation · loads skills from .agents/skills/
Install the "api-test-plan" agent skill from https://github.com/mohitagw15856/pm-claude-skills/tree/main/skills/api-test-plan into .agents/skills/api-test-plan/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "api-test-plan", then confirm the skill loads.Codex copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
$ npx skills add mohitagw15856/pm-claude-skills --skill api-test-plan -a cursorProject install goes to .agents/skills/; add -g for ~/.cursor/skills/.
$ gh skill install mohitagw15856/pm-claude-skills api-test-plan --agent cursorProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/mohitagw15856/pm-claude-skills.git skills-src && mkdir -p .cursor/skills && cp -r skills-src/skills/api-test-plan .cursor/skills/api-test-plan && rm -rf skills-srcUse ~/.cursor/skills/ instead of .cursor/skills for a personal install.
Cursor skills documentation · loads skills from .cursor/skills/, .agents/skills/, .claude/skills/, .codex/skills/
Install the "api-test-plan" agent skill from https://github.com/mohitagw15856/pm-claude-skills/tree/main/skills/api-test-plan into .cursor/skills/api-test-plan/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "api-test-plan", then confirm the skill loads.Cursor copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
$ gemini skills install https://github.com/mohitagw15856/pm-claude-skills.git --path skills/api-test-plan--scope user (default) or --scope workspace; --path is the subfolder of the repo that holds the skill; --consent skips the security confirmation prompt.
$ npx skills add mohitagw15856/pm-claude-skills --skill api-test-plan -a gemini-cliProject install goes to .agents/skills/; add -g for ~/.gemini/skills/.
$ gh skill install mohitagw15856/pm-claude-skills api-test-plan --agent gemini-cliProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/mohitagw15856/pm-claude-skills.git skills-src && mkdir -p .gemini/skills && cp -r skills-src/skills/api-test-plan .gemini/skills/api-test-plan && rm -rf skills-srcUse ~/.gemini/skills/ instead of .gemini/skills for a personal install, then run /skills reload.
Gemini CLI skills documentation · loads skills from .gemini/skills/, .agents/skills/
Install the "api-test-plan" agent skill from https://github.com/mohitagw15856/pm-claude-skills/tree/main/skills/api-test-plan into .gemini/skills/api-test-plan/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "api-test-plan", then confirm the skill loads.Gemini CLI copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
$ gh skill install mohitagw15856/pm-claude-skills api-test-planInstalls for Copilot at project scope by default; add --scope user for a personal install. Preview a skill first with gh skill preview. Needs GitHub CLI 2.90.0 or later (public preview).
$ npx skills add mohitagw15856/pm-claude-skills --skill api-test-plan -a github-copilotProject install goes to .agents/skills/; add -g for ~/.copilot/skills/.
$ git clone --depth 1 https://github.com/mohitagw15856/pm-claude-skills.git skills-src && mkdir -p .github/skills && cp -r skills-src/skills/api-test-plan .github/skills/api-test-plan && rm -rf skills-srcUse ~/.copilot/skills/ instead of .github/skills for a personal install. Commit .github/skills so cloud agent and code review can use it.
GitHub Copilot skills documentation · loads skills from .github/skills/, .claude/skills/, .agents/skills/
Install the "api-test-plan" agent skill from https://github.com/mohitagw15856/pm-claude-skills/tree/main/skills/api-test-plan into .github/skills/api-test-plan/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "api-test-plan", then confirm the skill loads.GitHub Copilot copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
$ npx skills add mohitagw15856/pm-claude-skills --skill api-test-plan -a opencodeOpenCode documents no install command of its own. Project install goes to .agents/skills/; add -g for ~/.config/opencode/skills/.
$ gh skill install mohitagw15856/pm-claude-skills api-test-plan --agent opencodeProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/mohitagw15856/pm-claude-skills.git skills-src && mkdir -p .opencode/skills && cp -r skills-src/skills/api-test-plan .opencode/skills/api-test-plan && rm -rf skills-srcUse ~/.config/opencode/skills/ instead of .opencode/skills for a personal install.
OpenCode skills documentation · loads skills from .opencode/skills/, .claude/skills/, .agents/skills/
Install the "api-test-plan" agent skill from https://github.com/mohitagw15856/pm-claude-skills/tree/main/skills/api-test-plan into .opencode/skills/api-test-plan/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "api-test-plan", then confirm the skill loads.OpenCode copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
Facts
- Skill name
api-test-plan- GitHub stars
- 1.4k
- Token cost
- ~1.1k tokens
- SKILL.md length
- 509 words
- Files
- 1
- Skills in repo
- 1,322
- Repo updated
- First seen
- Licence
- MIT
At a glance
Plan tests for an API endpoint or service — functional, negative, and contract.
- Asked to test an API
- SKILL.md covers Working from a brief, Required Inputs, Output Format and Quality Checks, plus 3 more sections
- Instructions only: no scripts, shell commands, URLs or credentials in SKILL.md
- Write API test cases
What it does
API Test Plan is an agent skill from mohitagw15856/pm-claude-skills. Plan tests for an API endpoint or service — functional, negative, and contract. 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.
Its SKILL.md is about 1.1k tokens, which your agent loads only when the skill is triggered. It is a single SKILL.md file with no bundled scripts.
It sits in Backend & APIs, covering API testing and REST APIs. It works with GraphQL. The repository describes itself as: 1255 professional Agent Skills for Claude, ChatGPT, Gemini, Cursor & Codex — PRDs, postmortems, leases, medical bills, layoffs, go-bags, new countries. Plain markdown, MIT, in… The licence is MIT.
When your agent uses it
- Asked to test an API
- Write API test cases
- Plan REST/GraphQL endpoint testing
- Validate an API contract
Example prompts
- “/api-test-plan”
What it can do on your machine
Read from SKILL.md and the folder at commit 1cbf1f0. It shows what the files ask for, not the result of running them.
Tool permissions
Pre-approves nothing: there is no allowed-tools line, so your agent's usual permission prompts apply.
From allowed-tools in the SKILL.md frontmatter.
Runs code
No scripts in the folder and no shell commands in SKILL.md.
From the folder's file list and the shell code blocks in SKILL.md.
Network
No URLs in SKILL.md.
From URLs in SKILL.md, links to its own repository left out.
Credentials
Names no API keys, tokens, secrets or passwords.
From names ending in _API_KEY, _TOKEN, _SECRET, _KEY or _PASSWORD in SKILL.md.
Context cost
API Test Plan loads about 1.1k tokens when it runs. Until then it costs about 106 tokens; SKILL.md has 509 words of instructions outside code blocks.
Estimates: characters ÷ 4, the usual rule of thumb; real counts depend on the model's tokenizer. Scripts and assets cost tokens only if the agent reads them.
Safety
Auto-check passed
The automated check found no risky patterns in SKILL.md.
Automated static check — not a guarantee. Review scripts before installing. It scans the text of SKILL.md for risky patterns (piping downloads into a shell, reading credential files, hidden Unicode, destructive commands); files beside SKILL.md are not scanned.
SKILL.md
The full file from mohitagw15856/pm-claude-skills at commit 1cbf1f0, republished under its MIT licence (© mohitagw15856). 509 words, ~1,079 tokens.
Download SKILL.mdSave it as
.claude/skills/api-test-plan/SKILL.md (or your agent's skills folder).- name
- api-test-plan
- description
- Plan tests for an API endpoint or service — functional, negative, and contract. 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.
API Test Plan Skill
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.
Working from a brief
Given an endpoint or an API description, produce the test plan anyway — infer the likely parameters, responses, auth model, and error cases, labelling assumptions. Always include auth, validation, and negative cases. Never hand back a question instead of a plan.
Required Inputs
Ask for these only if they aren't already provided (else infer and label):
- The API — REST/GraphQL, the endpoints/operations, and what they do.
- Contract — request/response schemas, parameters, status codes (or an OpenAPI/spec if available).
- Auth & rules — the auth model (token/scopes/roles), rate limits, and validation rules.
- Dependencies & data — downstream services, and the data/state needed to test.
Output Format
API Test Plan: [API / endpoint]
Per endpoint, a set of cases grouped by type:
| ID | Endpoint | Case | Type | Request | Expected status | Expected body / assertion |
|---|---|---|---|---|---|---|
| API-01 | POST /orders | valid create | Functional | valid payload | 201 | body matches schema, id returned |
| API-02 | POST /orders | missing field | Validation | partial payload | 400 | error names the field |
| API-03 | POST /orders | no token | Auth | valid payload, no auth | 401 | not created |
| API-04 | POST /orders | wrong role | Authz | valid payload, wrong scope | 403 | not created |
| API-05 | GET /orders/{id} | not found | Negative | unknown id | 404 | error body |
Cover deliberately: happy path (correct status + schema), validation (missing/invalid/extra fields, types, boundaries), auth/authz (no token, expired, wrong scope/role), negative (not found, conflict, bad method), idempotency/concurrency where relevant, and errors (correct codes + helpful, consistent error bodies).
Contract checks — responses conform to the schema; required fields, types, and status codes match the spec; backward compatibility for existing clients.
Non-functional notes — rate limiting, pagination, large payloads, latency expectations, and security basics (no sensitive data leakage, proper status for unauthorised).
Setup — test data, environment, and any mocks/stubs for dependencies.
Show full SKILL.md (173 more words)Show less
Quality Checks
- Each endpoint is tested beyond 200 — error codes (4xx/5xx) and their bodies are asserted
- Auth and authorization cases are included (no token, expired, wrong scope/role)
- Validation/boundary/negative cases cover missing, invalid, and extra inputs
- Responses are checked against the schema/contract, incl. backward compatibility
- Status codes match the spec and are used correctly (e.g. 401 vs. 403, 400 vs. 422)
- Non-functional aspects (rate limits, pagination, data leakage) are noted
Anti-Patterns
- Do not test only the happy 200 — most API bugs are in validation, auth, and error paths
- Do not ignore the response schema — a 200 with the wrong body still breaks clients
- Do not skip authz (role/scope) testing — "logged in" isn't "allowed"
- Do not assert only status codes — check the body/contract too
- Do not overlook error-body quality and correct status semantics (401 vs 403, 400 vs 404)
Based On
API testing practice — contract/schema validation, status-code correctness, auth/authz coverage, and negative/boundary testing beyond the happy path.
Example Trigger Phrases
- "Test an API."
- "Write API test cases."
- "Plan REST/GraphQL endpoint testing."
- "Validate an API contract."
© mohitagw15856, MIT. Rendered from Markdown: HTML in the file is shown as text, images as links, and headings moved down two levels. Raw file
Files
Just SKILL.md in skills/api-test-plan of mohitagw15856/pm-claude-skills.
Open the folder on GitHubat commit 1cbf1f0
Compare with similar skills
API Test Plan next to the 5 skills that share the most tags, products or categories with it. Stars are the repository's; “used in” counts other GitHub owners with a copy.
| Skill | Stars | Used in | Tokens | Auto-check | Licence | Repo updated |
|---|---|---|---|---|---|---|
| API Test Plan this skillmohitagw15856/pm-claude-skills | 1.4k | — | ~1.1k | Automated safety check: Pass | MIT | |
| Use Yaakmountain-loop/yaak | 19k | — | ~1.9k | Automated safety check: Pass | MIT | |
| API TesterRightNow-AI/openfang | 18k | — | ~807 | Automated safety check: Pass | Apache-2.0 | |
| API Recon And Docsyaklang/hack-skills | 2.4k | — | ~456 | Automated safety check: Pass | MIT | |
| Webui Connection Infolablup/backend.ai-webui | 133 | — | ~556 | Automated safety check: Notes | LGPL-3.0 | |
| API DesignerJeffallan/claude-skills | 12k | 2 repos | ~2k | Automated safety check: Pass | MIT |
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Questions about API Test Plan
What does API Test Plan do?
Plan tests for an API endpoint or service — functional, negative, and contract. API Test Plan is an agent skill from mohitagw15856/pm-claude-skills. Plan tests for an API endpoint or service — functional, negative, and contract.
When should I use API Test Plan?
API Test Plan fits situations like: asked to test an API; write API test cases; plan REST/GraphQL endpoint testing; validate an API contract.
How do I install API Test Plan in Claude Code?
Run `npx skills add mohitagw15856/pm-claude-skills --skill api-test-plan -a claude-code`. Or copy the skill folder (skills/api-test-plan in mohitagw15856/pm-claude-skills) into .claude/skills/api-test-plan in your project. Claude Code loads it when a task matches its description.
How do I install API Test Plan in Codex?
Run `npx skills add mohitagw15856/pm-claude-skills --skill api-test-plan -a codex`. Or copy the skill folder (skills/api-test-plan in mohitagw15856/pm-claude-skills) into .agents/skills/api-test-plan in your project. Codex loads it when a task matches its description.
Can I use API Test Plan in Cursor, Gemini CLI or GitHub Copilot?
Cursor, Gemini CLI, GitHub Copilot and OpenCode also load SKILL.md folders. With the skills CLI, run `npx skills add mohitagw15856/pm-claude-skills --skill api-test-plan -a cursor` (or -a gemini-cli, github-copilot or opencode for the others). To copy it by hand, put the folder in .cursor/skills/api-test-plan, .gemini/skills/api-test-plan, .github/skills/api-test-plan and .opencode/skills/api-test-plan in your project.
What does API Test Plan need to run?
SKILL.md names no scripts, command-line tools or credentials: API Test Plan is instructions for the agent only.
Does API Test Plan access the network?
SKILL.md contains no URLs. Any network use would come from the scripts or tools the agent runs. This is read from the text; nothing was executed.
Is API Test Plan safe to install?
Our automated static check of SKILL.md found no risky patterns, such as piping downloads into a shell, reading credential files or hidden Unicode. It is not a guarantee. Review the folder before installing.
What licence does API Test Plan use?
API Test Plan is published under the MIT licence (the repository's licence). It allows redistribution, so the full SKILL.md is shown on this page.
How many tokens does API Test Plan use?
About 1.1k tokens (SKILL.md is roughly 4.3k characters). Agents keep only the skill's name and description in context until a task matches; then they load SKILL.md in full.
What are the alternatives to API Test Plan?
Skills that share tags, products or a category with API Test Plan: Use Yaak (mountain-loop/yaak, 19k stars), API Tester (RightNow-AI/openfang, 18k stars), API Recon And Docs (yaklang/hack-skills, 2.4k stars) and Webui Connection Info (lablup/backend.ai-webui, 133 stars). The comparison table on this page puts their stars, adoption, token cost, safety result and licence side by side.
Who maintains API Test Plan?
mohitagw15856 (a GitHub user) maintains it in mohitagw15856/pm-claude-skills, which has 1,431 GitHub stars. The repository holds 1,322 skills in this directory. The repository was last updated on October 7, 2026.
Source: mohitagw15856/pm-claude-skills on GitHub. Facts on this page come from the repository at the commit we read; the author's words are quoted as theirs.