Fix the contract and its version
OpenAPI describes HTTP interfaces; it does not make an imagined path or field correct. Fix the API’s official schema, version, server and authentication method before generating a client. If observed responses differ from the schema, record the discrepancy instead of silently inventing compatibility behavior. For a hypothetical order-list client, implement only the fields established by the provider’s contract. Separate development and production destinations and retain the schema revision with source. That gives future regeneration an explicit basis and prevents a later maintainer from treating the agent’s plausible explanation as the API specification.
Check missing and null values
Check whether an order note can be absent, null or an empty string; those states need not mean the same thing. A numeric-looking identifier may be a string whose leading zero must survive. Avoid inventing rounding or local-time conversions for amounts and timestamps. Ask the agent to explain contract meaning and transformation points, not merely emit types. Include responses with missing optional fields, unknown additional fields and unexpected values. A human must decide which conditions to reject or preserve. Compile-time convenience should not silently change the provider’s data semantics or hide an unsupported response shape.
Design authentication and retries separately
Define credential sourcing, expiry and denied access without embedding secrets in source or prompts. Refreshing expired authentication and retrying a failed connection are separate decisions. A repeated mutation, such as order creation, can duplicate an effect. Check the provider’s documented idempotency and retry conditions instead of adding unconditional automatic resubmission when the contract is silent. Begin the pilot with reads and test mutations only against controlled development records. This keeps external effects attributable and prevents a useful-looking resilience wrapper from introducing behavior nobody verified with the service that owns the transaction.
Hypothetical task: a second results page
For a hypothetical order list, check the second page, final page and empty results as well as the first response. Follow the target API’s cursor and count semantics instead of assuming page numbers. Define whether already loaded records remain after an error and how the user resumes. Give the agent contract examples and expected interface states, then check duplicate display. This is not a claim about a particular API. It is an evaluation that exposes boundaries hidden by one successful request and connects client behavior to the experience users depend on when a longer retrieval fails.
Keep verification independent
Whether using Cursor or Claude Code to investigate surrounding code, or a scoped Aider edit, derive expected verification independently from the contract. Record mock success separately from working live authentication and transport. Review whether ambiguous types were introduced merely to satisfy compilation. Separating regenerable code from a maintained adapter can make later contract changes clearer. Pilot one schema change at a time and reject unnecessary edits to unrelated screens or storage. The tool should help explain the compatibility decision, rather than make a green type check stand in for evidence that the client still implements the intended interface.
Budget maintenance of the boundary
Before purchasing more agent capacity, record contract investigation, generation, checking and repair with their usage. Missing official schema or response examples may matter more than a larger context window. Handoff should include the contract revision, regeneration procedure, configuration names, error policy and untested operations. The client should remain maintainable as ordinary source after model access ends. The API-provider agreement and development-tool agreement are separate. Review each on retirement rather than assuming stopping one changes the other’s operation or billing. This preserves ownership of the boundary after the original generation session is gone.
Official sources
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- OpenAPI Specification 3.2.1Information checked: 2026-10-28
- Cursor Agent overviewInformation checked: 2026-10-26
- Claude Code overviewInformation checked: 2026-10-27
- Cursor pricingInformation checked: 2026-10-26
- Cursor models and pricingInformation checked: 2026-10-26
- Claude Code costsInformation checked: 2026-10-27
- Claude Code permissionsInformation checked: 2026-10-27
- Aider usageInformation checked: 2026-10-27
- Aider chat modesInformation checked: 2026-10-27
- Aider models and keysInformation checked: 2026-10-27