703 Technologies Fuzzing Testing
jabrena/plinth
A skill your agent uses when you need to add or review fuzz testing for Java APIs with CATS — including contract-driven negative testing, malformed payload validation, boundary input exploration, CI…
Generate API test suites from route definitions across frameworks: auth, input validation, contract, k6 load testing, mocking, and OpenAPI-driven generation.
Install API Test Suite Builder
$ npx skills add borghei/Claude-Skills --skill api-test-suite-builder -a claude-codeProject install by default; add -g for ~/.claude/skills/.
$ gh skill install borghei/Claude-Skills api-test-suite-builder --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/borghei/Claude-Skills.git skills-src && mkdir -p .claude/skills && cp -r skills-src/engineering/api-test-suite-builder .claude/skills/api-test-suite-builder && 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-suite-builder" agent skill from https://github.com/borghei/Claude-Skills/tree/main/engineering/api-test-suite-builder into .claude/skills/api-test-suite-builder/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "api-test-suite-builder", 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/borghei/Claude-Skills/tree/main/engineering/api-test-suite-builderType 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 borghei/Claude-Skills --skill api-test-suite-builder -a codexProject install goes to .agents/skills/; add -g for ~/.codex/skills/.
$ gh skill install borghei/Claude-Skills api-test-suite-builder --agent codexProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/borghei/Claude-Skills.git skills-src && mkdir -p .agents/skills && cp -r skills-src/engineering/api-test-suite-builder .agents/skills/api-test-suite-builder && 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-suite-builder" agent skill from https://github.com/borghei/Claude-Skills/tree/main/engineering/api-test-suite-builder into .agents/skills/api-test-suite-builder/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "api-test-suite-builder", 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 borghei/Claude-Skills --skill api-test-suite-builder -a cursorProject install goes to .agents/skills/; add -g for ~/.cursor/skills/.
$ gh skill install borghei/Claude-Skills api-test-suite-builder --agent cursorProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/borghei/Claude-Skills.git skills-src && mkdir -p .cursor/skills && cp -r skills-src/engineering/api-test-suite-builder .cursor/skills/api-test-suite-builder && 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-suite-builder" agent skill from https://github.com/borghei/Claude-Skills/tree/main/engineering/api-test-suite-builder into .cursor/skills/api-test-suite-builder/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "api-test-suite-builder", 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/borghei/Claude-Skills.git --path engineering/api-test-suite-builder--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 borghei/Claude-Skills --skill api-test-suite-builder -a gemini-cliProject install goes to .agents/skills/; add -g for ~/.gemini/skills/.
$ gh skill install borghei/Claude-Skills api-test-suite-builder --agent gemini-cliProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/borghei/Claude-Skills.git skills-src && mkdir -p .gemini/skills && cp -r skills-src/engineering/api-test-suite-builder .gemini/skills/api-test-suite-builder && 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-suite-builder" agent skill from https://github.com/borghei/Claude-Skills/tree/main/engineering/api-test-suite-builder into .gemini/skills/api-test-suite-builder/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "api-test-suite-builder", 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 borghei/Claude-Skills api-test-suite-builderInstalls 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 borghei/Claude-Skills --skill api-test-suite-builder -a github-copilotProject install goes to .agents/skills/; add -g for ~/.copilot/skills/.
$ git clone --depth 1 https://github.com/borghei/Claude-Skills.git skills-src && mkdir -p .github/skills && cp -r skills-src/engineering/api-test-suite-builder .github/skills/api-test-suite-builder && 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-suite-builder" agent skill from https://github.com/borghei/Claude-Skills/tree/main/engineering/api-test-suite-builder into .github/skills/api-test-suite-builder/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "api-test-suite-builder", 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 borghei/Claude-Skills --skill api-test-suite-builder -a opencodeOpenCode documents no install command of its own. Project install goes to .agents/skills/; add -g for ~/.config/opencode/skills/.
$ gh skill install borghei/Claude-Skills api-test-suite-builder --agent opencodeProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/borghei/Claude-Skills.git skills-src && mkdir -p .opencode/skills && cp -r skills-src/engineering/api-test-suite-builder .opencode/skills/api-test-suite-builder && 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-suite-builder" agent skill from https://github.com/borghei/Claude-Skills/tree/main/engineering/api-test-suite-builder into .opencode/skills/api-test-suite-builder/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "api-test-suite-builder", 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-suite-builder- GitHub stars
- 874
- Token cost
- ~1.6k tokens
- SKILL.md length
- 659 words
- Files
- 7 (incl. scripts, references)
- Skills in repo
- 364
- Repo updated
- First seen
- Licence
- MIT
At a glance
Generate API test suites from route definitions across frameworks: auth, input validation, contract, k6 load testing, mocking, and OpenAPI-driven generation.
- Adding new APIs
- SKILL.md covers Core Capabilities, When to Use, Clarify First and Tools, plus 3 more sections
- Runs Python scripts from its folder; calls python
- Auditing test coverage
What it does
API Test Suite Builder is an agent skill from borghei/Claude-Skills. Generate API test suites from route definitions across frameworks: auth, input validation, contract, k6 load testing, mocking, and OpenAPI-driven generation. Use when adding new APIs, auditing test coverage, or building regression suites.
Its SKILL.md is about 1.6k tokens, which your agent loads only when the skill is triggered. The skill folder holds 8 other files, including scripts and reference files (for example `references/contract-and-load-testing.md`, `references/route-detection-and-matrices.md` and `references/workflow-and-quality.md`).
It sits in Testing & QA, covering Load testing, API testing and OpenAPI specifications. It works with OpenAPI. The repository describes itself as: 385 AI skills, 77 expert agents, and 900 stdlib Python tools for every team: engineering, PM, marketing, C-level, compliance, business ops, research, and a LinkedIn toolkit… The licence is MIT.
When your agent uses it
- Adding new APIs
- Auditing test coverage
- Building regression suites
Example prompts
- “/api-test-suite-builder”
Requirements
- Python 3
- Node.js
What it can do on your machine
Read from SKILL.md and the folder at commit c9a1487. 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
Ships 3 files in scripts/ (Python), which the agent can run.
Shell commands in SKILL.md call:
python
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 Suite Builder loads about 1.6k tokens when it runs, and up to ~6.1k if it reads all its reference files. Until then it costs about 65 tokens; SKILL.md has 659 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); the scripts in this folder are not scanned.
SKILL.md
The full file from borghei/Claude-Skills at commit c9a1487, republished under its MIT licence (© borghei). 659 words, ~1,573 tokens.
Download SKILL.mdSave it as
.claude/skills/api-test-suite-builder/SKILL.md (or your agent's skills folder). This skill also uses 6 other files; get the full folder from GitHub.- name
- api-test-suite-builder
- description
- Generate API test suites from route definitions across frameworks: auth, input validation, contract, k6 load testing, mocking, and OpenAPI-driven generation. Use when adding new APIs, auditing test coverage, or building regression suites.
- license
- MIT + Commons Clause
- metadata.version
- 1.1.0
- metadata.author
- borghei
- metadata.category
- engineering
- metadata.domain
- api-testing
- metadata.tier
- POWERFUL
- metadata.updated
- 2026-06-17
- metadata.frameworks
- vitest, pytest, supertest, httpx, k6, pact
API Test Suite Builder
Scan API route definitions across frameworks (Next.js App Router, Express, FastAPI, Django REST, Go net/http), analyze request/response schemas, and generate comprehensive test suites covering authentication, authorization, input validation, error handling, pagination, file uploads, rate limiting, contract testing, and load testing. Outputs ready-to-run test files for Vitest+Supertest (Node), Pytest+httpx (Python), or k6 (load testing).
Core Capabilities
- Route detection & analysis — scan source files to extract endpoints, parse request/response schemas, detect auth middleware and authorization rules across Node, Python, and Go frameworks.
- Test matrix generation — auth (valid/invalid/expired tokens, wrong roles), input validation (missing/wrong-type/boundary/injection), error paths (400/401/403/404/409/422/429/500), pagination, file uploads, and rate limiting.
- Contract testing — OpenAPI-to-test generation, Pact consumer-driven contracts, schema snapshot testing for breaking-change detection.
- Load testing — k6 scripts with ramp-up patterns and SLA thresholds, latency percentile tracking (P50/P95/P99), concurrent user simulation.
When to Use
- New API added — generate a test scaffold before implementation (TDD).
- Legacy API with no tests — scan and generate baseline coverage.
- Pre-release — ensure all routes have at least smoke tests.
- API contract change — detect and test breaking changes.
- Security audit — generate adversarial input tests.
- Performance validation — create load-test baselines.
Clarify First
Before generating the suite, confirm these inputs. If any is unknown or vague, ASK — do not assume:
- Target framework — Vitest+Supertest, Pytest+httpx, or k6 (determines the emitted test-file format via
--framework) - Spec or routes source — an OpenAPI spec or the source files to scan (the input the generator parses)
- Test scope — auth, input validation, contract, load, or the full matrix (which test categories get generated)
Stop rule: ask only the 2-3 that most change the output. If the user says "just draft it," proceed and list your assumptions at the top of the artifact.
Tools
| Tool | Purpose | Command |
|---|---|---|
test_generator.py | Generate API test skeletons from an OpenAPI/Swagger spec | python scripts/test_generator.py spec.json --framework vitest --output tests/ |
coverage_analyzer.py | Compare spec endpoints vs existing test files to find gaps | python scripts/coverage_analyzer.py spec.json tests/ --threshold 95 |
contract_validator.py | Validate response samples against OpenAPI schema contracts | python scripts/contract_validator.py spec.json samples/ --strict |
References
Load the reference that matches the task — keep this file lean and pull detail on demand:
- references/route-detection-and-matrices.md — per-framework route-detection shell commands and the full auth / input-validation / pagination test matrices with worked TypeScript examples. Read when scanning a codebase or writing the core test cases.
- references/contract-and-load-testing.md — complete Pact consumer-driven contract test and k6 load-test scripts, plus the commands to run load tests locally, against staging, and in the cloud. Read when adding contract or performance tests.
- references/workflow-and-quality.md — the 9-step generation workflow, reusable test-helper patterns (auth, authed request, factories), common pitfalls, best practices, a troubleshooting table, and the success-criteria bar. Read before generating a suite and before shipping it.
Show full SKILL.md (222 more words)Show less
Scope & Limitations
This skill covers:
- Generating test suites from route definitions for REST APIs across Node.js, Python, and Go frameworks
- Authentication, authorization, input validation, pagination, and error-path test generation
- Consumer-driven contract testing with Pact and schema snapshot validation
- Load and performance testing script generation with k6 and Artillery
This skill does NOT cover:
- GraphQL API testing (see
engineering/api-design-reviewerfor schema review patterns) - End-to-end browser testing or UI interaction testing (see
engineering/playwright-pro) - Database migration testing or schema validation (see
engineering/database-schema-designer) - Security penetration testing beyond input sanitization checks (see
engineering/skill-security-auditor)
Integration Points
| Skill | Integration | Data Flow |
|---|---|---|
engineering/api-design-reviewer | Validate API design before generating tests | Design review output defines the endpoint contracts that this skill generates tests for |
engineering/ci-cd-pipeline-builder | Embed generated tests into CI/CD pipelines | Generated test files and k6 scripts are added as pipeline stages with pass/fail gates |
engineering/playwright-pro | Complement API tests with E2E browser tests | API test suite validates backend behavior; Playwright tests validate the frontend consuming those APIs |
engineering/database-schema-designer | Align test fixtures with database schema | Schema definitions inform factory functions and seed data used in generated test helpers |
engineering/observability-designer | Monitor test-covered endpoints in production | Load test thresholds (P95, P99) feed into alerting rules for the same endpoints in production dashboards |
engineering/performance-profiler | Investigate endpoints that fail load test thresholds | k6 results identify slow endpoints; the profiler skill traces root causes at the code level |
© borghei, MIT. Rendered from Markdown: HTML in the file is shown as text, images as links, and headings moved down two levels. Raw file
Files
SKILL.md and 6 other files (scripts, references) in engineering/api-test-suite-builder of borghei/Claude-Skills.
- SKILL.md
- references/contract-and-load-testing.md
- references/route-detection-and-matrices.md
- references/workflow-and-quality.md
- scripts/contract_validator.py
- scripts/coverage_analyzer.py
- scripts/test_generator.py
Open the folder on GitHubat commit c9a1487
Compare with similar skills
API Test Suite Builder 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 Suite Builder this skillborghei/Claude-Skills | 874 | — | ~1.6k | Automated safety check: Pass | MIT | |
| 703 Technologies Fuzzing Testingjabrena/plinth | 445 | — | ~874 | Automated safety check: Pass | Apache-2.0 | |
| Type Safetyidavidov13/agentic-playwright | 223 | — | ~3.5k | Automated safety check: Pass | MIT | |
| API Testingidavidov13/agentic-playwright | 223 | — | ~5.7k | Automated safety check: Pass | MIT | |
| Contextcounterfact/api-simulator | 170 | — | ~384 | Automated safety check: Pass | MIT | |
| Test Automationrevfactory/harness-100 | 1.3k | — | ~1.7k | Automated safety check: Pass | Apache-2.0 |
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Questions about API Test Suite Builder
What does API Test Suite Builder do?
Generate API test suites from route definitions across frameworks: auth, input validation, contract, k6 load testing, mocking, and OpenAPI-driven generation. API Test Suite Builder is an agent skill from borghei/Claude-Skills. Generate API test suites from route definitions across frameworks: auth, input validation, contract, k6 load testing, mocking, and OpenAPI-driven generation.
When should I use API Test Suite Builder?
API Test Suite Builder fits situations like: adding new APIs; auditing test coverage; building regression suites.
How do I install API Test Suite Builder in Claude Code?
Run `npx skills add borghei/Claude-Skills --skill api-test-suite-builder -a claude-code`. Or copy the skill folder (engineering/api-test-suite-builder in borghei/Claude-Skills) into .claude/skills/api-test-suite-builder in your project. Claude Code loads it when a task matches its description.
How do I install API Test Suite Builder in Codex?
Run `npx skills add borghei/Claude-Skills --skill api-test-suite-builder -a codex`. Or copy the skill folder (engineering/api-test-suite-builder in borghei/Claude-Skills) into .agents/skills/api-test-suite-builder in your project. Codex loads it when a task matches its description.
Can I use API Test Suite Builder 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 borghei/Claude-Skills --skill api-test-suite-builder -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-suite-builder, .gemini/skills/api-test-suite-builder, .github/skills/api-test-suite-builder and .opencode/skills/api-test-suite-builder in your project.
What does API Test Suite Builder need to run?
Going by SKILL.md and its folder, API Test Suite Builder needs Python for the scripts in its folder and the command-line tools its instructions call (python). Our summary lists: Python 3; Node.js.
Does API Test Suite Builder 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 Suite Builder 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. The check reads SKILL.md only: the scripts in the folder are not scanned, so read them before running anything.
What licence does API Test Suite Builder use?
API Test Suite Builder is published under the MIT licence (declared in SKILL.md). It allows redistribution, so the full SKILL.md is shown on this page.
How many tokens does API Test Suite Builder use?
About 1.6k tokens (SKILL.md is roughly 6.3k characters). Agents keep only the skill's name and description in context until a task matches; then they load SKILL.md in full. Its references folder adds about 4.6k tokens, read only when the agent opens those files.
What are the alternatives to API Test Suite Builder?
Skills that share tags, products or a category with API Test Suite Builder: 703 Technologies Fuzzing Testing (jabrena/plinth, 445 stars), Type Safety (idavidov13/agentic-playwright, 223 stars), API Testing (idavidov13/agentic-playwright, 223 stars) and Context (counterfact/api-simulator, 170 stars). The comparison table on this page puts their stars, adoption, token cost, safety result and licence side by side.
Who maintains API Test Suite Builder?
borghei (a GitHub user) maintains it in borghei/Claude-Skills, which has 874 GitHub stars. The repository holds 364 skills in this directory. The repository was last updated on October 7, 2026.
Source: borghei/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.