Mocking APIs Skill for OpenAPI Error and Timeout Fixtures

Build local mock responses from the API contract and exercise visible success, missing-resource, and timeout states.

Install in Claude Code

Use an OpenAPI 3 definition, your own frontend, and a local mock tool supported by the project. Use synthetic data.

Get the complete `plugins/api-development/api-mock-server/skills/mocking-apis` directory from the pinned GitHub commit.
Copy it into the target project's `.claude/skills/`. Check `.claude/skills/mocking-apis/SKILL.md`, start Claude Code at the project root, and call `/mocking-apis`.

Example task

Mock GET /products/{id}. Return 200 for mug-01, a contract-compatible 404 for missing, and a 500 ms delay for slow. Configure a 200 ms client timeout.

What to check

The client shows a product, a missing-resource state, and a timeout state under the corresponding fixtures.

Original SKILL.md on GitHub · Updated 2026-11-13

Frequently asked question

Can a 500 response stand in for a timeout test?

Use a controlled delay to test the client's deadline. Keep the server 500 response as its own case.