API Testing

What it does

When your agent uses it

• Standalone API tests covering schemas
• Status/error handling
• Contract checks
• Not for browser E2E specs

Example prompts

• “/api-testing”

Requirements

• Node.js
• A Bash shell

Workflow steps

5 steps, taken from the first numbered list in SKILL.md.

1. 1Schema validation on every response — never trust an unvalidated response
2. 2Test all HTTP status codes — happy path AND error states
3. 3Auth testing is mandatory — verify 401/403 for protected endpoints
4. 4Data-driven — test with valid, invalid, boundary, and empty values
5. 5Stateless where possible — each test cleans up or uses unique data

What it can do on your machine

Read from SKILL.md and the folder at commit 65a72d5. 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 1 file in scripts/ (Shell, TypeScript and Java), which the agent can run.

  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 Testing loads about 1.5k tokens when it runs, and up to ~6.1k if it reads all its reference files. Until then it costs about 89 tokens; SKILL.md has 452 words of instructions outside code blocks.

Always · name and description, kept in context so the agent knows when to use it

~89

When it runs · the whole SKILL.md, loaded when a task matches

~1.5k

With references · SKILL.md plus every file in references/, read only if the agent opens them

~6.1k

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

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 fugazi/test-automation-skills-agents at commit 65a72d5, republished under its MIT licence (© fugazi). 452 words, ~1,491 tokens.

name

api-testing

description

Test REST and GraphQL endpoint contracts using Playwright request fixture (TypeScript) or REST Assured (Java). Use for standalone API tests covering schemas, auth, status/error handling, pagination, idempotency, rate limits, or contract checks; not for browser E2E specs. Keywords: REST, GraphQL, API contract, schema validation, REST Assured.

license

Complete terms in LICENSE.txt

import { test, expect } from "@playwright/test";

test("GET /api/users returns 200 with valid schema", async ({ request }) => {
  const response = await request.get("/api/users");
  expect(response.ok()).toBeTruthy();
  const body = await response.json();
  expect(body).toMatchObject({ data: expect.any(Array) });
});

import static io.restassured.RestAssured.*;
import static org.hamcrest.Matchers.*;

import java.util.List;

import org.junit.jupiter.api.DisplayName;
import org.junit.jupiter.api.Test;

@Test
@DisplayName("GET /api/users returns 200 with valid schema")
void getUsers() {
    String token = "test-token";

    given()
        .header("Authorization", "Bearer " + token)
    .when()
        .get("/api/users")
    .then()
        .statusCode(200)
        .body("data", is(instanceOf(List.class)))
        .body("data.size()", greaterThan(0));
}

© fugazi, 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 9 other files (scripts, references) in skills/api-testing of fugazi/test-automation-skills-agents.

• SKILL.md
• LICENSE.txt
• references/contract-testing.md
• references/playwright-api-testing.md
• references/rest-api-patterns.md
• references/rest-assured-testing.md
• references/schema-validation.md
• scripts/api-health-check.sh
• templates/playwright-api-spec.ts
• templates/rest-assured-test.java

Open the folder on GitHubat commit 65a72d5