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Best agent skills for API development

We found 348 agent skills for API development in the catalog; these are the 15 that rank highest. The order comes from our rank, which weighs adoption, freshness, documentation and publisher identity. Nobody can pay for a place on this list. fsi-foundation-openapi, api-tester and api-gateway-backend-security-and-rate-limiting lead it. fsi-foundation-openapi, api-gateway-backend-security-and-rate-limiting and api-gateway-mcp-server are published by the company that makes them. api-design-principles comes from the largest repository here (48,428 stars). 10 of the 15 had activity in the last 30 days. Each entry lists why it made the list and links to its install page.

Updated Oct 26, 2026 · Built from catalog data; how we rank and grade

Top 15 of 348

  1. 1
    fsi-foundation-openapi

    aws-jp-fsi-saOfficial

    Reference architecture and CDK samples for building financial Open API (オープンAPI) workloads on AWS, from the "BLEA for FSI / Financial Reference Architecture…

    • Published by the vendor
    • Active in the last 30 days
    • Open source (MIT-0)

    ★ 15Last active Oct 15, 2026Claude Code, Claude apps, Codex, Cursor +6

  2. 2
    api-tester

    laolaoshiren

    依据真实 OpenAPI、路由实现和现有测试生成并验证 API 测试。用于用户要求测试接口、补集成测试、验证 API 契约、生成回归用例或排查接口兼容性时；区分“生成测试”和“执行请求”的授权，不猜测状态码、响应结构或 SLA，不在未确认环境中发送写请求。

    • Open source (MIT)

    ★ 893Last active Jul 16, 2026Claude Code, Claude apps, Codex, Cursor +6

  3. 3
    api-gateway-backend-security-and-rate-limiting

    googleOfficial

    Secures and rate limits backend services behind Google Cloud API Gateway across OpenAPI 2.0 and OpenAPI 3.0.x API configurations, including MCP-enabled…

    • Published by the vendor
    • Repository has 21.5K stars
    • Active in the last 30 days

    ★ 21.5KLast active Oct 19, 2026Claude Code, Claude apps, Codex, Cursor +6

  4. 4
    api-gateway-mcp-server

    googleOfficial

    Configures Google Cloud API Gateway to act as a remote Model Context Protocol (MCP) server (Public Preview) that exposes REST APIs as agent tools over HTTP…

    • Published by the vendor
    • Repository has 21.5K stars
    • Active in the last 30 days

    ★ 21.5KLast active Oct 19, 2026Claude Code, Claude apps, Codex, Cursor +6

  5. 5
    code-documenter

    https://github.com/Jeffallan

    Generates, formats, and validates technical documentation — including docstrings, OpenAPI/Swagger specs, JSDoc annotations, doc portals, and user guides.

    • Repository has 12K stars
    • Active in the last 30 days
    • Open source (MIT)

    ★ 12KLast active Oct 16, 2026Claude Code, Claude apps, Codex, Cursor +6

  6. 6
    api-designer

    https://github.com/Jeffallan

    Use when designing REST or GraphQL APIs, creating OpenAPI specifications, or planning API architecture.

    • Repository has 12K stars
    • Active in the last 30 days
    • Open source (MIT)

    ★ 12KLast active Oct 16, 2026Claude Code, Claude apps, Codex, Cursor +6

  7. 7
    backend-development

    MoizIbnYousaf

    Backend API design, database architecture, microservices patterns, and test-driven development.

    • Repository has 1.2K stars
    • Open source (MIT)

    ★ 1.2KLast active May 3, 2026Claude Code, Claude apps, Codex, Cursor +6

  8. 8
    aohp-uda

    aohp-os

    Generate personalized HTML apps via UDAGen on AOHP — idea-only or with structured input (requirements, OpenAPI, schemas).

    • Open source (Apache-2.0)

    ★ 156Last active Jun 21, 2026Claude Code, Claude apps, Codex, Cursor +6

  9. 9
    go-api-design

    eduardo-sl

    HTTP/REST API design for Go services: handlers, ServeMux routing, middleware, request validation, pagination, idempotency, health checks, error responses, and…

    • Active in the last 30 days
    • Open source (MIT)

    ★ 82Last active Oct 14, 2026Claude Code, Claude apps, Codex, Cursor +6

  10. 10
    api-gateway

    maton

    API gateway for calling third-party APIs with managed OAuth connections, provided by Maton (https://maton.ai).

    • Repository has 2.2K stars
    • Open source (MIT)

    ★ 2.2KLast active Jul 20, 2026Claude Code, Claude apps, Codex, Cursor +6

  11. 11
    api-patterns

    sharkrebel

    API design principles: RESTful, GraphQL, gRPC, versioning, pagination, error format.

    • Active in the last 30 days
    • Ships helper scripts
    • For Python

    ★ 73Last active Oct 2, 2026Claude Code, Claude apps, Codex, Cursor +6

  12. 12
    t-design

    timzaak

    Generate technical design documents including API design, database schema, and implementation details for a feature.

    • Active in the last 30 days
    • Open source (Apache-2.0)

    ★ 97Last active Oct 20, 2026Claude Code, Claude apps, Codex, Cursor +6

  13. 13
    api-design-principles

    sickn33

    Master REST and GraphQL API design principles to build intuitive, scalable, and maintainable APIs that delight developers and stand the test of time.

    • Largest repository here (48,428 stars)
    • Active in the last 30 days
    • Open source (MIT)

    ★ 48.4KLast active Oct 24, 2026Claude Code, Claude apps, Codex, Cursor +6

  14. 14
    route-to-openapi

    zebbern

    Generates RESTful API documentation (OpenAPI 3.0 / Swagger spec) by scanning route definitions in code for Flask, FastAPI, Express, Gin, and other frameworks.

    • Repository has 4.7K stars
    • Open source (MIT)
    • Ships helper scripts

    ★ 4.7KLast active May 31, 2026Claude Code, Claude apps, Codex, Cursor +6

  15. 15
    mixins

    finom

    Vovk.ts OpenAPI mixins — importing third-party OpenAPI 3.x schemas as typed client modules that share the same call signature as native Vovk RPC modules.

    • Active in the last 30 days
    • Open source (MIT)

    ★ 54Last active Oct 22, 2026Claude Code, Claude apps, Codex, Cursor +6

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