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AI agent for backend developers

API Contract Drift Repair Agent

Schema, clients and implementation agree, without surprise breaking changes.

CodingQuality controlIT and development
See how it worksGet access
API Contract Drift Repair Agent: what goes in, what the agent does and what you get

What it does

API schemas and generated clients drift away from what the implementation actually returns, and consumers break without warning. After a merge, or when a consumer reports a mismatch, this agent calls the sandbox endpoints and compares real responses with the published schema. For each mismatch it decides whether to update the draft schema, regenerate the client or ask the API owner, based on the behavior the owner approved. It applies the change on a branch and runs the consumer contract tests. If any consumer fails, it refines or reverts the change. Breaking changes always go to the owner. Edge case: a field documented as required is missing in real responses, which could be a bug or intended, so the agent asks the owner.

How it works

Follow the arrows from top to bottom. The orange dashed arrow is the loop: when a check fails, the agent goes back and tries again.

Start and resultWhat it doesA check on its own workWaits for your OKGoes back and retries
Yes, continueApprovedNo 1 STARTS WHEN Implementation change or consumer report 2 USES A TOOL Call sandbox endpoints and diff against the schema 3 DOES Decide: schema draft, regenerated client, or ownerquestion 4 USES A TOOL Apply the change on a branch 5 USES A TOOL Run consumer contract tests 6 CHECKS THE RESULT Do all consumers pass? If not: refine or revert the change. Back to step 3. 7 YOU APPROVE API owner approves any breaking change andpublication 8 RESULT Tested contract-alignment change set
Read the steps as a list
  1. Implementation change or consumer report
  2. Call sandbox endpoints and diff against the schema
  3. Decide: schema draft, regenerated client, or owner question
  4. Apply the change on a branch
  5. Run consumer contract tests
  6. Do all consumers pass?If not: refine or revert the change. Back to step 3.
  7. API owner approves any breaking change and publicationThe agent waits here for your OK.
  8. Tested contract-alignment change set

How it decides

It classifies each mismatch by approved intent and runs consumer tests; a still-failing consumer means refine or revert.

  • The owner-approved behavior wins over the current implementation.
  • Breaking changes always go to review.
  • Revert any change that fails a consumer contract test twice.

Make it yours

Every agent is a starting point. You choose these settings for your own situation.

  • Endpoints and environments tested
  • Consumers whose contract tests must pass
  • What counts as a breaking change (default removed fields and new required values)
  • Who approves publication

What keeps you in control

It always asks you first

  • Breaking changes
  • Publication
  • Deployment

Hard limits

  • Branch only.

It stops when

  • Done: consumers pass.

Set it up

We guide you through the set-up, step by step

Members get the full set-up guide for this agent. No technical skills needed: you copy, paste and upload.

10 minto set it up in your AI
5 AIsChatGPT, Claude, Copilot, Gemini, Grok
  • One set of instructions to paste into your AI, with the clicks for ChatGPT, Claude, Microsoft 365 Copilot, Gemini and Grok
  • The agent then walks you through connecting your own data, one source at a time
  • A downloadable copy with the flow chart, the rules and the full guide
Get access to this agent

An example run

What happensAfter a merge on March 4, the agent found the orders endpoint returned a new status value 'on_hold' not in the schema. It added the value to the draft schema and regenerated the client. Contract tests failed for the mobile app, which rejected unknown statuses, so the check failed. The agent marked it as breaking and the API owner approved a version bump on March 5.

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