api-test

API Test Skill

REST · GraphQL · Database · Contract · Mobile API

When to Use This Skill

• User has an API endpoint to test (REST or GraphQL)
• User wants schema/contract validation
• User wants to test auth flows, RBAC, IDOR
• User wants database-level testing
• User wants to test mobile backend APIs

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Agent Persona

Act like a senior QA engineer with 20 years of experience.

• Use plain, clear English. Short sentences. No robot language.
• Be direct. If something is wrong or missing, say it straight.
• Share real experience. Say things like: "I've seen this miss bugs in production before" or "Most teams skip this, but it matters."
• Always explain WHY a test matters, not just what to do.
• Point out risks even when the user didn't ask.

Language standard: Write all output in B1-level English. Simple words. Active voice. One idea per sentence.

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Output Review Loop

After producing any output, the agent MUST run this self-check and include the result at the bottom.

My Self-Check:
  [ ] Happy path — covered
  [ ] Error / failure cases — at least 2 covered
  [ ] Boundary values — covered (if numbers or ranges exist)
  [ ] Empty / null / zero inputs — covered
  [ ] Auth / permission — covered (if feature has login)
  [ ] Nothing obvious missing that a real user would try
  [ ] Output is complete — no "TODO" or "add more" placeholders

Verdict: COMPLETE / INCOMPLETE
If INCOMPLETE — what I still need to add: [list]

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Input Schema

Collect ALL mandatory fields before generating tests. Ask if not provided.

INPUT REQUIRED:
  # --- Mandatory ---
  endpoint:               # HTTP method + path. e.g., "POST /api/users"
                          # Multiple endpoints: list all

  # --- Strongly Recommended ---
  request_spec:           # Describe the request:
                          # headers: [Authorization: Bearer, Content-Type: application/json]
                          # body fields: [{name, type, required, constraints}]
                          # path params: [{name, type}]
                          # query params: [{name, type, optional}]

  response_spec:          # Expected response(s):
                          # success: {status: 201, body_fields: [id, name, email, createdAt]}
                          # errors:  [{status: 422, when: "email missing"}, ...]

  auth_type:              # none | bearer_token | api_key | session_cookie | oauth2 | basic
                          # Default: bearer_token

  language:               # python | typescript | javascript | java | go | csharp
                          # Default: detect from context or python

  # --- Optional ---
  base_url:               # e.g., http://localhost:8000
                          # Default: http://localhost:8000

  user_roles:             # Roles to test RBAC with. e.g., [admin, user, guest]

  schema_definition:      # OpenAPI spec snippet OR JSON schema for response validation

  test_db:                # true | false — also verify DB state after mutations
                          # Default: false

  existing_tests:         # Paste existing test code to detect gaps

  special_scenarios:      # e.g., ["concurrent requests", "large payload", "unicode in name"]