The request asks what to use for API design. The most directly relevant product is the api-design guidelines for designing RESTful APIs and TypeScript interfaces, indexed as an action of Mastra 1, which is an indexed action rather than a standalone product. For designing and documenting APIs as products, Swagger offers design, governance and testing across the API lifecycle built around OpenAPI and AsyncAPI specifications 4, Fern generates SDKs and interactive API docs 9, and AsyncAPI prov
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Swaggerswagger.iowebsite read, tools not yet checked
Provides open source and professional tools for designing, governing and testing APIs built on OpenAPI, AsyncAPI and JSON Schema specifications 4.
- 2
Fernbuildwithfern.comverified and signed
Generates SDKs in multiple languages and creates interactive API documentation with AI search from API definitions 9.
for agents: tools · observability · ai
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- 4
Mastramastra.aiverified and signed
Its api-design action gives guidelines for designing RESTful APIs and TypeScript interfaces when designing new endpoints or reviewing API contracts 1.
+13 community tools built for it
for agents: api-design · mastra · brand-guidelines
Sources
- 1TypeScript AI Framework for Agents and Apps | Mastramastra.ai · read 2026-10-29
- 4API Documentation & Design Tools for Teams | Swaggerswagger.io · read 2026-10-29
- 5AsyncAPI Initiative for event-driven APIs | AsyncAPI Initiative for event-driven APIsasyncapi.com · read 2026-10-29
- 9Build with Fern | Fern Documentationbuildwithfern.com · read 2026-10-29
For agents: the 10 actions behind this answer
api-design · api-design verified and signed
Guidelines for designing RESTful APIs and TypeScript interfaces. Use when designing new endpoints, reviewing API contracts, or structuring data models.
aspnet-minimal-api-openapi · aspnet-minimal-api-openapi verified and signed
Create ASP.NET Minimal API endpoints with proper OpenAPI documentation
aws-amplify · aws-amplify verified and signed
Build full-stack apps with AWS Amplify Gen 2 using guided workflows for authentication, data models, storage, GraphQL APIs, and Lambda functions.
· Swagger website read, tools not yet checked
Simplify API development for users, teams, and enterprises with our open source and professional toolset. Findogut how Swagger can help you and get started today.
asyncapi · @asyncapi/generator verified and signed
wp-rest-api · wp-rest-api verified and signed
Use when building, extending, or debugging WordPress REST API endpoints/routes: register_rest_route, WP_REST_Controller/controller classes, schema/argument validation, permission_callback/authentication, response shaping, register_rest_field/register_meta, or exposing CPTs/taxonomies via show_in_res
custom_api_call · Figma (Activepieces) verified and signed
Custom API Call — Make a custom API call to a specific endpoint
fastapi · fastapi verified and signed
FastAPI best practices and conventions. Use when working with FastAPI APIs, Pydantic models, dependencies, streaming responses including Server-Sent Events (SSE), and serving frontend apps. Keeps FastAPI code clean and up to date with the latest features and patterns.
tools · nemo-relay verified and signed
· Aip website read, tools not yet checked
Labels are the instruments' verdict and are never changed by ranking. Agents and robots get this same answer as JSON at /api/v1/find?q=…&answer=1 and through the MCP server.