@kubb/cli

@kubb/cli

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Official CLI for Kubb. Run kubb generate to transform OpenAPI/Swagger specs into TypeScript types, API clients, hooks, validators, and mocks. Includes interactive project setup (kubb init), spec validation, watch mode, MCP server, and agent server commands.

Installation

bun add -D @kubb/cli
# or
pnpm add -D @kubb/cli
# or
npm install -D @kubb/cli

Commands

• kubb init — scaffold a new project
• kubb generate — run code generation
• kubb validate — validate an OpenAPI spec
• kubb mcp — start the MCP server for AI assistants
• kubb agent start — start the HTTP agent server

kubb init

Scaffold a kubb.config.ts and install plugins for code generation from an OpenAPI spec. Run without flags for an interactive setup wizard, or pass flags to skip the prompts.

npx kubb init

Options

Flag	Short	Type	Default	Description
--yes	-y	boolean	false	Skip all prompts and use defaults
--input <path>	-i	string	./openapi.yaml	Path to the OpenAPI specification
--output <path>	-o	string	./src/gen	Output directory for generated files
--plugins <list>		string		Comma-separated list of plugins to install

Available plugin values for --plugins: plugin-ts, plugin-client, plugin-react-query, plugin-vue-query, plugin-zod, plugin-faker, plugin-msw, plugin-cypress, plugin-mcp, plugin-redoc.

Examples

# Interactive wizard
npx kubb init

# Accept all defaults
npx kubb init --yes

# Fully non-interactive
npx kubb init --input ./openapi.yaml --output ./src/gen --plugins plugin-ts,plugin-zod

# Select specific plugins only
npx kubb init --plugins plugin-ts,plugin-client,plugin-react-query

The wizard will:

• Detect or create a package.json if one does not exist
• Prompt for your OpenAPI specification path (default: ./openapi.yaml)
• Ask for the output directory (default: ./src/gen)
• Let you choose which plugins to install
• Install the selected packages using your package manager (npm, pnpm, yarn, or bun)
• Generate a kubb.config.ts with your chosen configuration

kubb generate

Generate TypeScript types, API clients, React Query hooks, Zod schemas, and more from an OpenAPI specification. Reads kubb.config.ts by default. Pass an OpenAPI file path as the first argument to override the input without editing the config.

npx kubb generate

Options

Flag	Short	Type	Default	Description
[input]		string		OpenAPI file path — overrides input.path in the config
--config <path>	-c	string		Path to the Kubb config file
--logLevel <level>	-l	string	info	Log level: silent, info, verbose, or debug
--watch	-w	boolean	false	Re-generate whenever the input file changes
--debug	-d	boolean	false	Override log level to debug
--verbose	-v	boolean	false	Override log level to verbose
--silent	-s	boolean	false	Override log level to silent

Examples

# Use kubb.config.ts in the current directory
npx kubb generate

# Override the input spec without editing the config
npx kubb generate ./openapi.yaml

# Point to a custom config file
npx kubb generate --config ./configs/kubb.config.ts

# Watch for changes and regenerate automatically
npx kubb generate --watch

# Debug output
npx kubb generate --debug

kubb validate

Parse and validate an OpenAPI/Swagger file for structural correctness. Reports schema errors, missing required fields, and malformed references. Use this before running generate to catch spec issues early.

npx kubb validate --input <path-or-url>

Options

Flag	Short	Type	Required	Description
--input <path>	-i	string	✅	Path or URL to the OpenAPI/Swagger file to validate

Examples

# Validate a local file
npx kubb validate --input ./openapi.yaml

# Validate a remote spec
npx kubb validate --input https://petstore3.swagger.io/api/v3/openapi.json

kubb mcp

Start a Model Context Protocol (MCP) server that exposes Kubb code generation as a tool for AI assistants. Once running, configure your AI client (Claude, Cursor, Windsurf, etc.) to connect — the assistant can then call kubb generate directly without leaving the chat.

Runs over stdio by default (compatible with all MCP clients). Pass --port to expose an HTTP server instead.

npx kubb mcp

Options

Flag	Short	Type	Default	Description
--port <number>	-p	string		Port for HTTP MCP server (omit for stdio)
--host <hostname>		string	localhost	Hostname to bind to (HTTP mode only)

Examples

# stdio mode (recommended for Claude Desktop, Cursor, etc.)
npx kubb mcp

# HTTP mode
npx kubb mcp --port 3001

MCP client configuration

Add the following to your MCP client config (e.g. Claude Desktop's claude_desktop_config.json):

{
  "mcpServers": {
    "kubb": {
      "command": "npx",
      "args": ["kubb", "mcp"]
    }
  }
}

kubb agent start

Start the Kubb Agent HTTP server. Exposes a REST API that accepts a kubb.config.ts patch and returns generated code as a stream. Use --allow-write to also write files to disk.

npx kubb agent start

Options

Flag	Short	Type	Default	Description
--config <path>	-c	string		Path to the Kubb config file
--port <number>	-p	string	3000	Port the HTTP server listens on
--host <hostname>		string	0.0.0.0	Hostname the HTTP server binds to
--allow-write		boolean	false	Write generated files to disk (otherwise output is streamed only)
--allow-all		boolean	false	Grant all permissions (implies --allow-write)

Examples

# Start with defaults
npx kubb agent start

# Custom port
npx kubb agent start --port 4000

# Allow writing files to disk
npx kubb agent start --allow-write

# Full permissions with custom config
npx kubb agent start --config ./kubb.config.ts --allow-all

See the @kubb/agent README for full environment variable reference, Docker setup, WebSocket API, and Studio integration.

Supporting Kubb

Kubb uses an MIT-licensed open source project with its ongoing development made possible entirely by the support of Sponsors. If you would like to become a sponsor, please consider:

• Become a Sponsor on GitHub