# Docs

> How to use Context Atlas from a coding agent or a browser, through the MCP server, the agent prompt, the llms.txt files and the JSON API.

Context Atlas is a catalog of the sources that vendors publish for coding agents: llms.txt indexes, docs, MCP servers, agent skills, rule files and CLIs. It exists so that a project can be built and run entirely from inside an agent harness such as Claude Code, Codex or Cursor, without a person opening dashboards or vendor consoles.

The catalog itself is small. Its value is that your agent finds the right, current, vendor-maintained sources for a stack instead of relying on what it remembers from training.

## Three ways in

| You want to… | Use | Start here |
| --- | --- | --- |
| Let an agent search the catalog with tools | The MCP server at `https://contextatlas.dev/mcp` | [MCP server](https://contextatlas.dev/docs/mcp) |
| Point an agent at the catalog with one sentence | The prompt on [/agent](https://contextatlas.dev/agent) | [Give it to your agent](https://contextatlas.dev/docs/agents) |
| Read the catalog yourself or from a script | The [home page](https://contextatlas.dev/), [/llms.txt](https://contextatlas.dev/llms.txt) and the [JSON API](https://contextatlas.dev/docs/api) | [Site map](https://contextatlas.dev/docs/website) |

Nothing needs an account, a key or a login.

## New here?

Follow the [Quickstart](https://contextatlas.dev/docs/quickstart). It connects the MCP server to your agent and runs a first query in about two minutes.

## For agents

Every page of these docs is also available as Markdown: add `.md` to the URL, for example [/docs/mcp.md](https://contextatlas.dev/docs/mcp.md). [/llms.txt](https://contextatlas.dev/llms.txt) links all of them, and [/llms-full.txt](https://contextatlas.dev/llms-full.txt) contains the catalog and every docs page in one file.