hey api codegen
Generate TypeScript clients from OpenAPI specs using @hey-api/openapi-ts. Type-safe API clients with Zod schemas. Use when: generating TypeScript clients from OpenAPI specifications for frontend or API consumers.
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Install
Works with every agent the skills CLI supports.
npx skills add https://github.com/blockmatic/basilic --skill hey-api-codegen- 01
Install
Run the command in your project. The CLI asks which agents to install for.
- 02
Describe the task
Ask your agent for something this skill covers. It loads hey api codegen automatically when relevant.
- 03
Review the result
The agent follows the SKILL.md steps, scripts and references bundled with the skill.
SKILL.md
The instructions your agent reads when the skill is triggered.
Skill: openapi-ts
Scope
- Applies to: Generating TypeScript clients from OpenAPI 3.0 specifications using
@hey-api/openapi-ts - Does NOT cover: Writing OpenAPI specs, API server implementation (see fastify)
Assumptions
@hey-api/openapi-tsv0+- OpenAPI 3.0 specification format
- TypeScript v5+ with strict mode
- Zod for runtime validation (when using Zod schemas)
Principles
- Generate clients from OpenAPI specs (single source of truth)
- Use generated Zod schemas for runtime validation
- Client methods are fully typed from OpenAPI spec
- Error responses are typed from OpenAPI error schemas
- Use
createClientfactory for client instantiation - Configure output format and schema type in config file
Constraints
MUST
- Use
openapi-ts.config.tsfor configuration - Generate clients before using in code
- Handle
response.errorfor typed error responses
SHOULD
- Use Zod schemas (
schemas.type: 'zod') for runtime validation - Use Prettier formatting (
output.format: 'prettier') - Generate TypeScript enums (
types.enums: 'typescript')
AVOID
- Manually editing generated code
- Using generated clients without error handling
- Mixing generated and manual client code
Interactions
- Consumes OpenAPI specs generated by fastify
- Works with nextjs for API client usage
- Integrates with TanStack Query (see React Query Integration)
Patterns
Configuration Pattern
// openapi-ts.config.ts
import { defineConfig } from '@hey-api/openapi-ts'
export default defineConfig({
input: './openapi.json',
output: {
path: './src/gen',
format: 'prettier',
},
types: {
enums: 'typescript',
},
schemas: {
type: 'zod',
},
})
Client Usage Pattern
import { createClient } from './gen/client'
const client = createClient({
baseUrl: 'https://api.example.com',
})
const response = await client.GET('/users/{id}', {
params: { path: { id: '123' } },
})
if (response.error) {
// Handle typed error
return
}
// response.data is typed from OpenAPI spec
See Config Template for complete example.
References
- React Query Integration - Using generated clients with TanStack Query
FAQ
What does the hey api codegen skill do?
Generate TypeScript clients from OpenAPI specs using @hey-api/openapi-ts. Type-safe API clients with Zod schemas. Use when: generating TypeScript clients from OpenAPI specifications for frontend or API consumers.
How do I install hey api codegen?
Run npx skills add https://github.com/blockmatic/basilic --skill hey-api-codegen in your project. The skills CLI detects the agents you use and copies the skill into the right folder. For Claude Code you can also place the skill folder at ~/.claude/skills/hey-api-codegen/ (personal) or .claude/skills/hey-api-codegen/ (project).
Which AI agents can use hey api codegen?
Any agent that supports the open Agent Skills format (a folder with a SKILL.md file), including Claude Code, Codex, Cursor, GitHub Copilot, Gemini CLI, Windsurf, Cline, OpenCode and more.
Is hey api codegen safe to install?
No partner security audit is available yet. Skills can run commands and scripts, so read the SKILL.md and any bundled files before installing.
Who maintains hey api codegen?
It is published by blockmatic in blockmatic/basilic. It has 42 recorded installs.
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