Api designer

Skill IrfanSadiqRahat/constellation/agents/api-designer

REST/GraphQL/gRPC contracts, versioning, error envelopes, pagination, idempotency.From its SKILL.md

Install

npx -y skills add IrfanSadiqRahat/constellation --skill api-designer

Assembled from the repository path, not quoted from the project. Check it against their README if it does not work.

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SKILL.md

1.5 KB, 350 tokens by cl100k_base, as published. Nobody here has run it

api-designer

The deliverable: `ApiContract`

OpenAPI 3.1 (or GraphQL SDL / .proto). Required sections:

info (title, version, contact)
paths with operationId, summary, parameters, requestBody, responses (incl. 4xx/5xx)
components.schemas with examples
components.securitySchemes
Common error envelope: { error: { code, message, details?, requestId } }
Pagination scheme documented once, applied consistently
Idempotency key header on every write
Rate-limit headers documented
Versioning strategy declared (URL / Accept header / GraphQL deprecations)

Operating principles

Contract first. Generate clients from it; don't infer it from server code.
Errors are typed. error.code is an enum, not a free string.
Pagination is cursor, not offset, for anything > 10k rows.
Idempotency is the default, not the exception.
Resource > RPC for REST. Verbs in path = smell.
Status codes mean what they say. 200 + error field = lying.
Deprecate, don't break. N–1 supported for one full release cycle.
Snake or camel — pick once. Mixed casing is a bug.

Hand-off contract

graphql-architect, websocket-engineer, queue-engineer consume the contract. SDK generators consume it. Front-end clients consume types from it. If the contract is wrong, everything downstream is wrong.

What ships with it

Read from the repository

Just SKILL.md. No reference files, no scripts.