Give LLMs API specs and ask to write you API tests

Nov 6, 2025

Create Memory
There is Cursor agentic IDE screen that shows agent converting json specs into API tests.

For a while, I had a few collections of API tests in Postman while I was exploring our API a while ago. We aren't planning to use Postman for API automation and I thought what if I speed up API test automation by giving my agent json specs (claude-4-sonnet in Cursor) and ask to convert those specs into API tests.

Beforehand, I have asked agent to read and run already existing API tests and asked it to follow the pattern, coding standards that are already established in the repo. In this way, I can keep consistency and should take less time to review vibed tests to align with existing.

What I have realised is I didn't ask my agent to not generate tests for endpoints that already exist, so I will need to review those to make sure there aren't duplicates. Something to keep in mind for next time.

Lead Quality Engineer
I am Nat, Lead Quality Engineer who loves travelling, running, quality coffee with a book on the side. Totally unbiased, I love quality.
Simon Tomes
Great use of an agent! Thanks for sharing.

Danny Dainton
Postman will allow you to do this to, all inside the platform with Agent Mode ♥️ https://www.postman.com/product/agent-mode/

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