home / skills / jeremylongshore / claude-code-plugins-plus-skills / generating-api-sdks

This skill helps you generate client SDKs from OpenAPI specs across languages, accelerating API consumption with automated scaffolding and testing.

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SKILL.md
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---
name: generating-api-sdks
description: |
  Generate client SDKs in multiple languages from OpenAPI specifications.
  Use when generating client libraries for API consumption.
  Trigger with phrases like "generate SDK", "create client library", or "build API SDK".
  
allowed-tools: Read, Write, Edit, Grep, Glob, Bash(api:sdk-*)
version: 1.0.0
author: Jeremy Longshore <[email protected]>
license: MIT
---

# Generating Api Sdks

## Overview


This skill provides automated assistance for api sdk generator tasks.
This skill provides automated assistance for the described functionality.

## Prerequisites

Before using this skill, ensure you have:
- API design specifications or requirements documented
- Development environment with necessary frameworks installed
- Database or backend services accessible for integration
- Authentication and authorization strategies defined
- Testing tools and environments configured

## Instructions

1. Use Read tool to examine existing API specifications from {baseDir}/api-specs/
2. Define resource models, endpoints, and HTTP methods
3. Document request/response schemas and data types
4. Identify authentication and authorization requirements
5. Plan error handling and validation strategies
1. Generate boilerplate code using Bash(api:sdk-*) with framework scaffolding
2. Implement endpoint handlers with business logic
3. Add input validation and schema enforcement
4. Integrate authentication and authorization middleware
5. Configure database connections and ORM models
1. Write integration tests covering all endpoints


See `{baseDir}/references/implementation.md` for detailed implementation guide.

## Output

- `{baseDir}/src/routes/` - Endpoint route definitions
- `{baseDir}/src/controllers/` - Business logic handlers
- `{baseDir}/src/models/` - Data models and schemas
- `{baseDir}/src/middleware/` - Authentication, validation, logging
- `{baseDir}/src/config/` - Configuration and environment variables
- OpenAPI 3.0 specification with complete endpoint definitions

## Error Handling

See `{baseDir}/references/errors.md` for comprehensive error handling.

## Examples

See `{baseDir}/references/examples.md` for detailed examples.

## Resources

- Express.js and Fastify for Node.js APIs
- Flask and FastAPI for Python APIs
- Spring Boot for Java APIs
- Gin and Echo for Go APIs
- OpenAPI Specification 3.0+ for API documentation

Overview

This skill generates client SDKs in multiple languages from OpenAPI specifications. It automates code scaffolding, schema-aware models, authentication hooks, and test stubs so teams can ship client libraries quickly.

How this skill works

The skill reads an OpenAPI 3.0 specification, extracts endpoints, models, and security schemes, and produces language-specific client code and documentation. It scaffolds request/response types, HTTP helpers, error wrappers, and authentication middleware, then emits tests and example usage. Outputs follow a predictable layout so you can integrate the generated SDK into CI/CD and package registries.

When to use it

  • You need client libraries for multiple languages from a single OpenAPI spec
  • Onboard third-party developers with consistent SDKs and examples
  • Automate SDK regeneration as your API evolves
  • Create language idiomatic wrappers for different platforms
  • Reduce manual client implementation and maintenance effort

Best practices

  • Keep a canonical, validated OpenAPI 3.0 spec as the single source of truth
  • Define clear securitySchemes in the spec to ensure consistent auth code generation
  • Design stable, versioned endpoints to minimize churn in generated SDKs
  • Add integration tests and examples immediately after generation
  • Customize templates to match your style guide and package conventions

Example use cases

  • Generate TypeScript, Python, Java, and Go clients from an API spec and publish to package registries
  • Produce SDKs with built-in OAuth2 or API key support and example auth flows
  • Regenerate clients as part of CI when the OpenAPI spec changes, then run integration tests
  • Create minimal example apps that demonstrate common flows using the generated SDK

FAQ

What input formats are supported?

OpenAPI 3.0+ specifications (JSON or YAML) are required. Ensure the spec includes schemas and security schemes for best results.

Can I customize code style or templates?

Yes. The generator supports template overrides so you can adapt naming, packaging, and idiomatic patterns per language.