Sample API migration review

This fictional example shows the structure and specificity of a paid review. It is not a report for a real client.

Executive result

2 breaking changes require compatibility work.
1 additive change should be documented.
Authentication and rate-limit behavior are unchanged in the supplied scope.

Reviewed scope

GET /v1/users/{id}, representative responses from versions 1.8 and 2.0, and the related OpenAPI response schema. Error payloads and webhook contracts were explicitly outside scope.

Change inventory

Severity	Change	Consumer impact	Recommendation
Breaking	`user.id`: integer → string	Strict decoders and generated SDK models may reject the response.	Preserve the integer field during a deprecation window or release a versioned endpoint and SDK major version.
Breaking	`user.name` removed; `user.display_name` added	Existing clients reading `name` receive an absent value.	Return both fields temporarily, document precedence, then remove `name` only after measured migration.
Additive	`request_id` added	Usually safe, but clients rejecting unknown properties can fail.	Document the field and include unknown-property tolerance in consumer tests.

Proposed compatibility sequence

Add display_name and request_id without removing or retyping existing fields.
Publish a deprecation notice with an explicit end date and examples.
Add contract tests for old and new SDK models.
Measure remaining reads of the deprecated representation where telemetry permits.
Move the type change and removal into a versioned contract.

Acceptance checklist

Old representative client successfully decodes the transition response.
New client reads display_name and string identifiers.
Unknown fields do not fail supported clients.
OpenAPI examples match production payloads.
Rollback behavior is documented before release.

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