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Agent skill

Generating REST APIs

by jeremylongshore in jeremylongshore/tons-of-skills-marketplace

Generate complete REST API implementations from OpenAPI specifications or database schemas.

MITAuto-check passedBackend & APIs

Install Generating REST APIs

skills CLI
$ npx skills add jeremylongshore/tons-of-skills-marketplace --skill generating-rest-apis -a claude-code

Project install by default; add -g for ~/.claude/skills/.

GitHub CLI
$ gh skill install jeremylongshore/tons-of-skills-marketplace generating-rest-apis --agent claude-code

Project scope by default; add --scope user for a personal install. Needs GitHub CLI 2.90.0 or later (public preview).

Manual copy
$ git clone --depth 1 https://github.com/jeremylongshore/tons-of-skills-marketplace.git skills-src && mkdir -p .claude/skills && cp -r skills-src/skills/.curated/generating-rest-apis .claude/skills/generating-rest-apis && rm -rf skills-src

Use ~/.claude/skills/ instead of .claude/skills for a personal install. The folder must contain SKILL.md.

Claude Code skills documentation · loads skills from .claude/skills/

Facts

Skill name
generating-rest-apis
GitHub stars
2.8k
Token cost
~1.3k tokens
SKILL.md length
530 words
Files
4 (incl. references)
Skills in repo
3,342
Repo updated
First seen
Licence
MIT

At a glance

Generate complete REST API implementations from OpenAPI specifications or database schemas.

  • Works in 9 steps: Scan the project for existing OpenAPI… → Parse resource entities from the… → Create route files implementing all five… → …
  • Generating RESTful API implementations
  • SKILL.md covers Overview, Prerequisites, Instructions and Output, plus 3 more sections
  • Instructions only: no scripts, shell commands, URLs or credentials in SKILL.md

What it does

Generating REST APIs is an agent skill from jeremylongshore/tons-of-skills-marketplace. Generate complete REST API implementations from OpenAPI specifications or database schemas. Use when generating RESTful API implementations. Trigger with phrases like "generate REST API", "create RESTful API", or "build REST endpoints".

Its SKILL.md is about 1.3k tokens, which your agent loads only when the skill is triggered. The skill folder holds 4 other files, including reference files (for example `references/errors.md`, `references/examples.md` and `references/implementation.md`). Compatibility notes: Designed for Claude Code

It sits in Backend & APIs, covering REST APIs and OpenAPI specifications. The repository describes itself as: Model-agnostic agent-skills platform with a harness-free canonical layer, verified adapters, and the ccpi package manager. Explore at tonsofskills.com. The licence is MIT.

When your agent uses it

  • Generating RESTful API implementations
  • With phrases like generate REST API
  • Create RESTful API
  • Build REST endpoints

Example prompts

  • “generate REST API”
  • “create RESTful API”
  • “build REST endpoints”
  • “/generating-rest-apis”

Requirements

  • Python 3
  • Node.js
  • Compatibility (from SKILL.md): Designed for Claude Code
  • Pre-approved tools (allowed-tools): Read, Write, Edit, Grep, Glob, Bash(api:rest-*)

Workflow steps

9 steps, taken from the first numbered list in SKILL.md.

  1. Scan the project for existing OpenAPI specs, database models, or route definitions using Glob and Read to establish current API surface…
  2. Parse resource entities from the specification and generate model definitions with field types, validation constraints, and relationship…
  3. Create route files implementing all five standard REST operations per resource: GET /resources (list with pagination), GET /resources/:id…
  4. Implement controller logic with input validation using JSON Schema or framework-native validators (Zod, Pydantic, Bean Validation).
  5. Add query parameter support for filtering (?status=active), sorting (?sort=-created_at), field selection (?fields=id,name), and…
  6. Wire authentication middleware to protect mutation endpoints (POST, PUT, DELETE) while allowing read access per configuration.
  7. Generate standardized error response envelopes with RFC 7807 Problem Details format for all 4xx/5xx responses.
  8. Create integration tests covering happy paths, validation failures, 404s, and auth rejection for every endpoint.
  9. Produce or update the OpenAPI 3.0 specification to match the generated implementation.

What it can do on your machine

Read from SKILL.md and the folder at commit cfae287. It shows what the files ask for, not the result of running them.

  • Tool permissions

    Pre-approves these tools, so the agent can use them without asking each time:

    • Read
    • Write
    • Edit
    • Grep
    • Glob
    • Bash(api:rest-*)

    From allowed-tools in the SKILL.md frontmatter.

  • Runs code

    No scripts in the folder and no shell commands in SKILL.md.

    From the folder's file list and the shell code blocks in SKILL.md.

  • Network

    Links to these hosts (documentation or services it may open):

    • spec.openapis.org

    From URLs in SKILL.md, links to its own repository left out.

  • Credentials

    Names no API keys, tokens, secrets or passwords.

    From names ending in _API_KEY, _TOKEN, _SECRET, _KEY or _PASSWORD in SKILL.md.

  • Compatibility

    Designed for Claude Code

    From compatibility in the SKILL.md frontmatter.

Context cost

Generating REST APIs loads about 1.3k tokens when it runs, and up to ~3.7k if it reads all its reference files. Until then it costs about 64 tokens; SKILL.md has 530 words of instructions outside code blocks.

Always · name and description, kept in context so the agent knows when to use it
~64
When it runs · the whole SKILL.md, loaded when a task matches
~1.3k
With references · SKILL.md plus every file in references/, read only if the agent opens them
~3.7k

Estimates: characters ÷ 4, the usual rule of thumb; real counts depend on the model's tokenizer. Scripts and assets cost tokens only if the agent reads them.

Safety

Auto-check passed

The automated check found no risky patterns in SKILL.md.

Automated static check — not a guarantee. Review scripts before installing. It scans the text of SKILL.md for risky patterns (piping downloads into a shell, reading credential files, hidden Unicode, destructive commands); files beside SKILL.md are not scanned.

SKILL.md

The full file from jeremylongshore/tons-of-skills-marketplace at commit cfae287, republished under its MIT licence (© jeremylongshore). 530 words, ~1,269 tokens.

Download SKILL.mdSave it as .claude/skills/generating-rest-apis/SKILL.md (or your agent's skills folder). This skill also uses 3 other files; get the full folder from GitHub.
name
generating-rest-apis
description
Generate complete REST API implementations from OpenAPI specifications or database schemas. Use when generating RESTful API implementations. Trigger with phrases like "generate REST API", "create RESTful API", or "build REST endpoints".
allowed-tools
Read, Write, Edit, Grep, Glob, Bash(api:rest-*)
compatibility
Designed for Claude Code
version
1.23.0
author
Jeremy Longshore <jeremy@intentsolutions.io>
license
MIT
tags
api, database, rest-apis

Generating REST APIs

Overview

Generate complete, production-ready REST API implementations from OpenAPI specifications, database schemas, or resource definitions. Scaffold CRUD endpoints with proper HTTP method semantics, content negotiation, pagination, filtering, and HATEOAS link generation across Express, FastAPI, Spring Boot, and Gin frameworks.

Prerequisites

  • Node.js 18+ with Express/Fastify, or Python 3.10+ with FastAPI/Flask, or Java 17+ with Spring Boot, or Go 1.21+ with Gin/Echo
  • OpenAPI 3.0+ specification or database schema (SQL DDL, Prisma, Sequelize models)
  • HTTP testing tool: curl, httpie, or Postman
  • Database server (PostgreSQL, MySQL, MongoDB) accessible for ORM integration
  • Package manager configured (npm, pip, Maven, or go modules)

Instructions

  1. Scan the project for existing OpenAPI specs, database models, or route definitions using Glob and Read to establish current API surface area.
  2. Parse resource entities from the specification and generate model definitions with field types, validation constraints, and relationship mappings.
  3. Create route files implementing all five standard REST operations per resource: GET /resources (list with pagination), GET /resources/:id, POST /resources, PUT /resources/:id, and DELETE /resources/:id.
  4. Implement controller logic with input validation using JSON Schema or framework-native validators (Zod, Pydantic, Bean Validation).
  5. Add query parameter support for filtering (?status=active), sorting (?sort=-created_at), field selection (?fields=id,name), and cursor-based or offset pagination.
  6. Wire authentication middleware to protect mutation endpoints (POST, PUT, DELETE) while allowing read access per configuration.
  7. Generate standardized error response envelopes with RFC 7807 Problem Details format for all 4xx/5xx responses.
  8. Create integration tests covering happy paths, validation failures, 404s, and auth rejection for every endpoint.
  9. Produce or update the OpenAPI 3.0 specification to match the generated implementation.

See ${CLAUDE_SKILL_DIR}/references/implementation.md for the full step-by-step implementation guide.

Output

  • ${CLAUDE_SKILL_DIR}/src/routes/ - Express/Fastify route definitions with HTTP method handlers
  • ${CLAUDE_SKILL_DIR}/src/controllers/ - Business logic separated from routing
  • ${CLAUDE_SKILL_DIR}/src/models/ - ORM models with validation rules and relationships
  • ${CLAUDE_SKILL_DIR}/src/middleware/auth.js - JWT/API key authentication middleware
  • ${CLAUDE_SKILL_DIR}/src/middleware/validate.js - Request schema validation middleware
  • ${CLAUDE_SKILL_DIR}/openapi.yaml - Generated OpenAPI 3.0 specification
  • ${CLAUDE_SKILL_DIR}/tests/ - Integration test suite per resource endpoint
Show full SKILL.md (212 more words)Show less

Error Handling

ErrorCauseSolution
400 Bad RequestRequest body fails schema validationReturn field-level validation errors with JSON pointer paths to invalid fields
401 UnauthorizedMissing or malformed Authorization headerRespond with WWW-Authenticate header indicating expected auth scheme
404 Not FoundResource ID does not exist in data storeReturn RFC 7807 body with resource type and requested ID for debugging
409 ConflictUnique constraint violation on create/updateInclude conflicting field name and existing value hint in error response
429 Too Many RequestsClient exceeds rate limitReturn Retry-After header with seconds until next allowed request window

Refer to ${CLAUDE_SKILL_DIR}/references/errors.md for comprehensive error patterns.

Examples

E-commerce product API: Generate CRUD endpoints for a Product resource with nested Category relationships, image upload handling, and inventory tracking fields with optimistic concurrency via ETags.

Multi-tenant SaaS API: Scaffold tenant-scoped endpoints where all queries automatically filter by tenant_id extracted from JWT claims, with tenant isolation enforced at the middleware layer.

Public read API with admin writes: Create a dual-access API where GET endpoints are publicly cacheable (Cache-Control headers) while POST/PUT/DELETE require admin-role JWT tokens.

See ${CLAUDE_SKILL_DIR}/references/examples.md for additional examples.

Resources

  • OpenAPI Specification 3.1: https://spec.openapis.org/oas/v3.1.0
  • RFC 7807 Problem Details for HTTP APIs
  • JSON:API Specification for standardized response formatting
  • Express.js, FastAPI, Spring Boot, and Gin framework documentation

© jeremylongshore, MIT. Rendered from Markdown: HTML in the file is shown as text, images as links, and headings moved down two levels. Raw file

Files

SKILL.md and 3 other files (references) in skills/.curated/generating-rest-apis of jeremylongshore/tons-of-skills-marketplace.

  • SKILL.md
  • references/errors.md
  • references/examples.md
  • references/implementation.md

Open the folder on GitHubat commit cfae287

Compare with similar skills

Generating REST APIs next to the 5 skills that share the most tags, products or categories with it. Stars are the repository's; “used in” counts other GitHub owners with a copy.

Generating REST APIs compared with similar skills
SkillStarsUsed inTokensAuto-checkLicenceRepo updated
Generating REST APIs this skilljeremylongshore/tons-of-skills-marketplace2.8k—~1.3kAutomated safety check: PassMIT
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Use Yaakmountain-loop/yaak19k—~1.9kAutomated safety check: PassMIT
API DesignerJeffallan/claude-skills12k1 repos~2kAutomated safety check: PassMIT
Old Coder API DesignAmazingAng/old-coder750—~3.4kAutomated safety check: PassMIT
API CallerNVIDIA/SkillEvaluator554—~1.1kAutomated safety check: PassApache-2.0

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Categories

Questions about Generating REST APIs

What does Generating REST APIs do?

Generate complete REST API implementations from OpenAPI specifications or database schemas. Generating REST APIs is an agent skill from jeremylongshore/tons-of-skills-marketplace. Generate complete REST API implementations from OpenAPI specifications or database schemas.

When should I use Generating REST APIs?

Generating REST APIs fits situations like: generating RESTful API implementations; with phrases like generate REST API; create RESTful API; build REST endpoints.

How do I install Generating REST APIs in Claude Code?

Run `npx skills add jeremylongshore/tons-of-skills-marketplace --skill generating-rest-apis -a claude-code`. Or copy the skill folder (skills/.curated/generating-rest-apis in jeremylongshore/tons-of-skills-marketplace) into .claude/skills/generating-rest-apis in your project. Claude Code loads it when a task matches its description.

How do I install Generating REST APIs in Codex?

Run `npx skills add jeremylongshore/tons-of-skills-marketplace --skill generating-rest-apis -a codex`. Or copy the skill folder (skills/.curated/generating-rest-apis in jeremylongshore/tons-of-skills-marketplace) into .agents/skills/generating-rest-apis in your project. Codex loads it when a task matches its description.

Can I use Generating REST APIs in Cursor, Gemini CLI or GitHub Copilot?

Cursor, Gemini CLI, GitHub Copilot and OpenCode also load SKILL.md folders. With the skills CLI, run `npx skills add jeremylongshore/tons-of-skills-marketplace --skill generating-rest-apis -a cursor` (or -a gemini-cli, github-copilot or opencode for the others). To copy it by hand, put the folder in .cursor/skills/generating-rest-apis, .gemini/skills/generating-rest-apis, .github/skills/generating-rest-apis and .opencode/skills/generating-rest-apis in your project.

What does Generating REST APIs need to run?

SKILL.md names no scripts, command-line tools or credentials: Generating REST APIs is instructions for the agent only. Our summary lists: Python 3; Node.js. Its frontmatter pre-approves these tools: Read, Write, Edit, Grep, Glob, Bash(api:rest-*). Compatibility (from SKILL.md): Designed for Claude Code.

Does Generating REST APIs access the network?

SKILL.md names 1 domain. As links in the text: spec.openapis.org. This is read from the text; nothing was executed.

Is Generating REST APIs safe to install?

Our automated static check of SKILL.md found no risky patterns, such as piping downloads into a shell, reading credential files or hidden Unicode. It is not a guarantee. Review the folder before installing.

What licence does Generating REST APIs use?

Generating REST APIs is published under the MIT licence (declared in SKILL.md). It allows redistribution, so the full SKILL.md is shown on this page.

How many tokens does Generating REST APIs use?

About 1.3k tokens (SKILL.md is roughly 5.1k characters). Agents keep only the skill's name and description in context until a task matches; then they load SKILL.md in full. Its references folder adds about 2.4k tokens, read only when the agent opens those files.

What are the alternatives to Generating REST APIs?

Skills that share tags, products or a category with Generating REST APIs: OpenAPI to MCP Server (mcp-use/mcp-use, 11k stars), Use Yaak (mountain-loop/yaak, 19k stars), API Designer (Jeffallan/claude-skills, 12k stars) and Old Coder API Design (AmazingAng/old-coder, 750 stars). The comparison table on this page puts their stars, adoption, token cost, safety result and licence side by side.

Who maintains Generating REST APIs?

jeremylongshore (a GitHub user) maintains it in jeremylongshore/tons-of-skills-marketplace, which has 2,827 GitHub stars. The repository holds 3,342 skills in this directory. The repository was last updated on October 10, 2026.

Source: jeremylongshore/tons-of-skills-marketplace on GitHub. Facts on this page come from the repository at the commit we read; the author's words are quoted as theirs.