Designing an API by hand means hours in YAML keeping paths, schemas, and examples consistent before a single line of server code exists. This designer drafts the whole spec from a plain description.
sonnet4 daysOpenAIOpenAPI 3.1StoplightRedocly
Claude
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README.md
Why this subagent
Designing an API by hand means hours in YAML keeping paths, schemas, and examples consistent before a single line of server code exists. This designer drafts the whole spec from a plain description.
Describe the use case and it returns a validated OpenAPI 3.1 spec with paths, schemas, auth, and example payloads, ready to feed straight into codegen. You review and merge instead of typing brackets.
How it runs
Used at step 01 to kick off the pipeline.
Write
Used at step 01 to kick off the pipeline.
WebFetch
Used at step 01 to kick off the pipeline.
WebSearch
Used at step 01 to kick off the pipeline.
Draft an OpenAPI 3.1 spec with paths, request and response schemas, and status codes for each operation.
pending
Add example payloads, auth definitions, and error shapes so the spec is ready for codegen.
pending
Validate the document against the OpenAPI schema and open a pull request with the result.
pending
Sample output
json
// Sample output
// (generated when the pipeline finishes)
Turn the described use case into a valid OpenAPI 3.1 document with named schemas, every CRUD path, request and response examples, auth, and standard error responses.
Unlock the rest
The full agent definition, install snippet, and starter task are gated for community members.
Members get the full `.md` agent file, the npm / pnpm install one-liners, a starter prompt that we've tuned against real runs, and the open-source repo when this automation ships there. One email, magic link, done.