cortex

Every developer. Every agent.

Cortex turns API specifications and Markdown into typed SDKs, interactive documentation, and an MCP server from one project configuration.

OpenAPI · AsyncAPI · GraphQL · gRPC · OpenRPC · Markdown

Documentation · Live demo · Website · Changelog

Cortex combines OpenAPI, AsyncAPI, GraphQL, Protocol Buffer, OpenRPC, and Markdown sources. Developers get interactive documentation, applications get typed SDKs, and AI agents get an MCP server with project context.

If Cortex helps your team, star this repository to support its development.

Try Cortex in 60 seconds

Start a local demo:

mkdir petstore
cd petstore
npm install --global @cortex-docs/cli
cortex init petstore
cortex docs serve

Open http://localhost:3012. Press Ctrl+C to stop the server.

We love open source

Keep your Markdown in Git. Add cortex.config.yml to the default branch of your public GitHub repository, then run:

npx -y @cortex-docs/cli deploy https://github.com/OWNER/REPO
npx -y @cortex-docs/cli mcp-serve https://github.com/OWNER/REPO

The first command publishes a free documentation site at PROJECT.cortexdocs.dev. The second connects AI clients to current documentation through local MCP.

Deploy requires repository write access. MCP works with public read access and checks for changes before each request.

See the open source hosting guide for configuration, custom domains, automatic updates, and limits.

Features

• Generate SDKs for TypeScript, Python, Go, Java, Kotlin, Ruby, PHP, C#, Rust, C++, and C.
• Combine multiple specification files in one generated SDK.
• Generate HTTP, WebSocket, GraphQL, gRPC, and JSON-RPC clients.
• Build static HTML documentation with interactive API reference pages.
• Generate an MCP server with typed tools, embedded specifications, SDK guides, and project documentation for AI agents.
• Add Markdown pages, SDK guides, and all API specifications to the MCP server.
• Customize generated output with sparse Eta template overrides.
• Publish generated packages and MCP servers to language registries and GitHub repositories.

Unlimited specs. Multiple ways to use it.

Generate interactive docs for exploration, typed SDKs for integration, and MCP servers for AI agents.

Task	Split toolchain	Cortex Docs
Configuration	Configure SDK, documentation, and MCP generators	Declare all API sources in one project configuration
Generation	Coordinate separate commands and output directories	Generate all configured outputs with one command
Customization	Maintain templates for each generator	Override only the required Eta templates
Publishing	Maintain a release process for each package	Review one publish plan for registries and GitHub
Developer interface	Keep guides separate from API references	Combine Markdown, API references, and SDK guides
Agent interface	Maintain MCP servers and context separately	Generate MCP servers with specifications, SDK guides, and project documentation

Requirements

• Node.js 20 or later
• npm 10 or later

Some generated SDKs require the normal compiler or package manager for their target language.

Configuration

cortex init creates cortex.config.yml. Relative paths start from the directory that contains this file.

project: my-api
title: My API Docs
logo: ./assets/logo.svg
theme: system
primaryColor: '#ffffff'
custom_head_html: |-
  <meta name="theme-color" content="#ffffff">
  <link rel="stylesheet" href="/assets/custom.css">

sources:
  - title: REST API
    type: openapi-spec
    spec: ./specs/openapi.yaml
    intro: ./docs/rest.md
    languages:
      - language: typescript
        package_name: '@my-org/my-api'
      - language: python
        package_name: my-api

  - title: Realtime API
    type: asyncapi-spec
    spec: ./specs/asyncapi.yaml
    languages:
      - language: typescript
        package_name: '@my-org/my-api'

  - title: GraphQL API
    type: graphql-spec
    spec: ./specs/schema.graphql
    endpoint: https://api.example.com/graphql
    languages:
      - language: typescript
        package_name: '@my-org/my-api'

output:
  base_dir: ./generated

docs:
  - section: Get started
    sources:
      - title: Quickstart
        document: ./docs/quickstart.md

mcp:
  package_name: '@my-org/my-api-mcp'

primaryColor sets the documentation accent color as a six-digit hex value.

custom_head_html adds trusted HTML to every documentation page. This field supports metadata, stylesheets, and analytics scripts.

Store local head resources in the project assets directory. Cortex serves these files from /assets/*.

Cortex does not sanitize this value. Add only HTML that you trust.

Add ?appearance=dark or ?appearance=light to any documentation URL to select its initial appearance. The parameter takes priority over the project theme and the visitor's stored preference.

For example, /docs/quickstart?appearance=dark opens the quickstart in dark mode. The theme button can change the appearance after the page loads.

Sources that use the same language and package_name are merged into one SDK. Cortex rejects duplicate operation and type names that would make a merge ambiguous.

See th