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Agent skills for API development in Claude Code

348 agent skills for API development in the catalog list Claude Code as a supported host. These are the 15 that rank highest, ordered by adoption, freshness and documentation. fsi-foundation-openapi, api-tester and api-gateway-backend-security-and-rate-limiting lead the list. Claude Code reads them from .claude/skills/<name>/SKILL.md in the project, or ~/.claude/skills/<name>/ for every project. A skill is a folder with a SKILL.md file; Claude Code loads it when a task matches its description. Every listing links to its source and shows a freshness grade.

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

How to install in Claude Code

npx skills add <owner>/<repo> --skill <name> -a claude-code

Where it goes: .claude/skills/<name>/SKILL.md in the project, or ~/.claude/skills/<name>/ for every project.

The host's docs describe copying a folder with a SKILL.md into a skills directory; the npx skills command is a third-party shortcut for the same thing.

Each listing page has the exact command for that listing.

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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