api-builder

Quality score: 70/100 · Category: Security · Sub-category: web-security

lang:pythonlang:typescripttype:generator

Generate complete FastAPI backend scaffolds from OpenAPI 3.x specifications. Automatically creates SQLAlchemy models, Pydantic schemas, FastAPI routers, CRUD operations, database migrations, pytest tests, and Next.js TypeScript clients. Use when user provides an OpenAPI/OpenSpec file (.yaml/.json) or pastes spec content, and wants to generate API code. Triggers on phrases like "generate API from spec", "build backend from OpenAPI", "create FastAPI from this spec", "implement these endpoints", or when user shares OpenAPI specification files. Supports Python 3.12+, FastAPI, SQLite, SQLAlchemy, Alembic, pytest, and Next.js App Router.

What this skill does

api-builder is a production-ready Claude Code skill (quality score 70/100) in the web-security sub-category. It ships as a SKILL.md file that Claude Code auto-discovers under ~/.claude/skills/api-builder-h2oslabs-synnovatorzero/ and loads when your prompt matches the skill's trigger.

When to invoke it: Use when user provides an OpenAPI/OpenSpec file (.yaml/.

Who uses this skill

The api-builder skill is built for security engineers, penetration testers, DevSecOps practitioners, and development teams hardening codebases and infrastructure. It is part of the open ClaudSkills registry, a community-curated catalog of 15,000+ capabilities you can install for Claude Code — the Claude CLI agent.

How to install

Free

Manual install (2 steps)

mkdir -p ~/.claude/skills/api-builder-h2oslabs-synnovatorzero
curl -L https://claudskills.com/skills/api-builder-h2oslabs-synnovatorzero/SKILL.md \
  -o ~/.claude/skills/api-builder-h2oslabs-synnovatorzero/SKILL.md

Or just download SKILL.md directly and drop it into ~/.claude/skills/api-builder-h2oslabs-synnovatorzero/. Claude Code auto-discovers it on next session.

Skills live at ~/.claude/skills/api-builder-h2oslabs-synnovatorzero/SKILL.md on macOS/Linux, or %USERPROFILE%\.claude\skills\api-builder-h2oslabs-synnovatorzero\SKILL.md on Windows. See the full install guide for step-by-step instructions.

Pro

One-click install via the desktop app

The ClaudSkills desktop app installs any skill directly into ~/.claude/skills/ with one click — no terminal required. Pro starts at $9/mo or $149 lifetime.

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Part of ClaudSkills — the open registry for Claude Code skills. · What's New · Install guide · About · llms.txt

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