---
title: Developer docs
description: Choose the skill, CLI, TypeScript SDK, or MCP server for your integration.
---

The toolkit has four entry points over the same TrainHeroic client and typed data shapes.
Choose based on who should drive the work.

<CardGroup cols={2}>
  <Card title="Claude Code skill" href="/developers/skill" icon="sparkles">
    The fastest way to let a coding agent inspect or operate your TrainHeroic account.
  </Card>
  <Card title="Command-line interface" href="/developers/cli" icon="terminal">
    JSON-in, JSON-out commands for scripts, terminals, and agent subprocesses.
  </Card>
  <Card title="TypeScript SDK" href="/developers/sdk" icon="braces">
    Runtime-agnostic auth, exercises, workouts, athlete history, analytics, and messaging.
  </Card>
  <Card title="MCP servers" href="/developers/mcp" icon="plug">
    Hosted OAuth or local stdio tools for Claude, Cursor, and other MCP clients.
  </Card>
</CardGroup>

## Pick a surface

| If you need to…                            | Start with…                            |
| ------------------------------------------ | -------------------------------------- |
| Ask Claude Code to work with your account  | [Claude Code skill](/developers/skill) |
| Run repeatable shell commands or emit JSON | [CLI](/developers/cli)                 |
| Build an application or automation         | [TypeScript SDK](/developers/sdk)      |
| Connect an AI client to typed tools        | [MCP server](/developers/mcp)          |

## Runtime requirements

Published packages require Node 18 or a modern runtime with `fetch` and Web Crypto. Developing
the monorepo itself requires Node 24 and pnpm 11.

:::warning
The TrainHeroic API is undocumented. Pin package versions in production and expect upstream
responses to change occasionally.
:::