API Contract Test Harness Pack
Generate contract tests that catch breaking API changes between producer and consumer services — extract the contract, map consumer expectations, produce failing tests, and get safe versioning guidance.
A 4-step agentic workflow pack for coding built to run with ChatGPT, Claude, Cursor, and Gemini. Open the Markdown files, fill the variables, and paste into your model. Most buyers get a reviewable result in about 10 minutes.
- Extract a precise API contract from any spec, OpenAPI doc, or service code in minutes
- Map exactly what each consumer relies on so tests guard the right fields and status codes
- Generate ready-to-run contract tests that fail the moment a breaking change reaches the producer
- Receive safe versioning and deprecation guidance so breaking changes ship with a migration path, not a production incident
Prompt Customization Service — optional help adapting variables and output to your brand voice. Choose your tier at checkout (not tied to this prompt's price).
This pack is $6 on its own. Buying every pack separately costs $935. The Lifetime Bundle is $149 one-time — you save $786 (84% off) and unlock every future pack free.
Get the Lifetime Bundle — $149Paste the license key from your receipt. It must match this prompt pack.
What ships with your purchase
Prompt files
Plain Markdown files with `{{variables}}` you fill in, ready to paste into ChatGPT, Claude, or Gemini. No setup, no tooling required.
Usage guide
Variable reference, model compatibility, examples, and customization tips so you can adapt the pack to your brand voice.
Lifetime updates
When we improve the pack, you get the new version automatically. Email support included with every purchase.
Models tested: ChatGPT, Claude, Cursor, Gemini.
The workflow inside this pack
4 composable prompts you run in order — each one picks up where the last left off.
- Step 1
Contract Extractor
Paste your OpenAPI spec, proto file, or service code and receive a structured contract table listing every endpoint, method, required fields, and expected response shapes.
- Step 2
Consumer Expectation Mapper
Paste the extracted contract and a description of each consumer service and get a per-consumer expectation table showing the exact fields and codes each consumer relies on.
- Step 3
Contract Test Generator
Paste the consumer expectation map and target language and receive ready-to-copy contract test stubs with assertions scoped to each consumer's expectations.
- Step 4 · optional
Versioning Guidance
Describe the change you want to make and paste the consumer expectation map and receive a recommended versioning strategy — additive, versioned, or deprecation-with-sunset.
Perpetual (lifetime) use license
Your one-time purchase includes an ongoing right to use this prompt pack with the AI tools and models you control for your own and your clients' work — not for resale or public redistribution of the files as a product.
We keep the copyright
The prompt files, guides, examples, and bundled assets stay our copyrighted works (or our licensors'). Payment grants the limited license in our Terms only — it does not transfer ownership.
Need help adapting this prompt to your team? Add Prompt Customization Service at checkout.