> ## Documentation Index
> Fetch the complete documentation index at: https://docs.atlaswork.ai/llms.txt
> Use this file to discover all available pages before exploring further.

# Atlas

> The e-signature platform where AI agents are first-class senders.

Atlas runs the entire signing lifecycle — store a document, prepare it, route it
to one or more parties in order, and return a signed PDF with a verifiable audit
trail — behind one clean API and MCP surface. Agents prepare, humans approve.

The developer surface **is** the product. Everything you can do in the dashboard
you can do programmatically, with review-before-send, idempotent writes, and
status built in.

<CardGroup cols={2}>
  <Card title="Quickstart" icon="rocket" href="/quickstart">
    Send your first envelope in a few minutes. An envelope is one document sent out for signature.
  </Card>

  <Card title="Core concepts" icon="book-open" href="/concepts">
    Envelopes, participants, fields, and the lifecycle.
  </Card>

  <Card title="API reference" icon="code" href="/api-reference/introduction">
    Generated straight from the live OpenAPI spec — always current.
  </Card>

  <Card title="MCP server" icon="robot" href="/mcp/overview">
    The signing lifecycle as a tool set for AI agents.
  </Card>
</CardGroup>

## How Atlas is documented

These docs are split by audience, mirroring the product's surfaces:

* **Guides** — task-oriented walkthroughs for building on the REST API.
* **MCP server** — the hosted Streamable HTTP tool surface for AI agents,
  authenticated with OAuth 2.1.
* **API reference** — generated from the API's OpenAPI document
  ([download](https://docs.atlaswork.ai/openapi.json)). The reference is never
  hand-maintained: adding a route to the API makes it appear here.

<Note>
  The API reference is rendered from the API's generated spec. If an endpoint looks new or changed,
  that's the source of truth catching up — not a docs edit.
</Note>

## The three surfaces

| Surface                                 | Audience                | Auth                        |
| --------------------------------------- | ----------------------- | --------------------------- |
| **REST API** (`/api/v1`)                | Developers              | API key                     |
| **MCP server** (`mcp.atlaswork.ai/mcp`) | AI agents               | OAuth 2.1 (Streamable HTTP) |
| **Signer links** (`/api/signer`)        | Recipients (no account) | HMAC envelope token         |

Each surface has exactly one authentication method. See
[Authentication](/guides/authentication) for details.