> ## Documentation Index
> Fetch the complete documentation index at: https://cortex-foundation-add13747-droid-1a2462c9-cor-444-sanitize.mintlify.site/llms.txt
> Use this file to discover all available pages before exploring further.

# Cortex Code

> A coding agent that works inside the repository — sessions, isolated runtimes, and pull-request reviews. Web Code is Cloud-only; This PC and SSH live on desktop and the CLI.

Cortex Code changes repositories. You describe the work, the agent carries it out inside a runtime prepared for that repository, and every step lands on a timeline you can read and stop. It is available in the web app, the desktop app, and the CLI, with one account across all three.

<Frame caption="The four commitments on the public Code page: one repository per runtime, reviews that stay failed when they fail, no pasted diff, the same account as Chat.">
  <img src="https://mintcdn.com/cortex-foundation-add13747-droid-1a2462c9-cor-444-sanitize/_zkvI1h_JpZuQFg3/images/product/code-public-features.png?fit=max&auto=format&n=_zkvI1h_JpZuQFg3&q=85&s=bb48af07d7c1172a5f77dfec2105224b" alt="Cortex Code feature grid — One repository per runtime, Reviews that stay failed when they fail, No pasted diff, The same account as Chat" width="1280" height="800" data-path="images/product/code-public-features.png" />
</Frame>

## What Code is

| Commitment                             | What it means for you                                                                                                                                          |
| -------------------------------------- | -------------------------------------------------------------------------------------------------------------------------------------------------------------- |
| **One repository per runtime**         | Each session gets an isolated guest on the same farm as Cortex Bot, without a desktop. The environment is installed by the agent, not guessed from a filename. |
| **Reviews stay failed when they fail** | A Cortex Security review is one pass over a diff. A failed review is stored as failed — never rewritten as an approval.                                        |
| **No pasted diff**                     | Code writes the change in the repository; Cortex Security reads the pull request in place. Neither asks you to paste a patch into a box.                       |
| **The same account as Chat**           | Sign in on cortex.foundation. No second identity.                                                                                                              |

## Who can open it

Code is a member surface. A guest visiting `/code` sees the public product page, and deep links show **This space is reserved** with **Continue in Chat** or **Sign in**. Once signed in, `/code` opens Code Home: connect GitHub, pick a repository, start a session. See [Accounts](/getting-started/accounts).

## Where it runs

| Surface     | Host                                        | Notes                             |
| ----------- | ------------------------------------------- | --------------------------------- |
| Web app     | **Cloud**                                   | Web Code is Cloud-only            |
| Desktop app | Cloud, **This PC**, **SSH**                 | [Code on desktop](/code/desktop)  |
| CLI         | Cloud by default; This PC and SSH by opt-in | [Code in the terminal](/code/cli) |

## What Code is not

| Not this                    | Use instead                                                                                              |
| --------------------------- | -------------------------------------------------------------------------------------------------------- |
| A Chat transcript           | A [session](/code/sessions) is a turn timeline — files read, edits, commands, plans                      |
| Chat's Python sandbox       | [Cloud runtimes](/code/cloud) — an isolated guest with your repository                                   |
| A Chat plugin               | [Connect GitHub](/code/github) — the repository connection lives in Code                                 |
| The public `/security` page | [Cortex Security](/code/security) — the signed-in review inbox at `/code/security`                       |
| A place to store secrets    | There is no Secrets page. Environment for a guest belongs to that guest; `/code/secrets` sends you home. |

## Modes in one line

**Ask** reads and explains. **Plan** proposes without changing anything. **Agent** edits files and runs commands. Pick per turn; the session row holds the default. See [Ask, Plan, Agent](/code/interactions).

## Next

* [Code quickstart](/code/quickstart) — first session in the web app.
* [Sessions](/code/sessions) — reading the timeline.
* [CLI](/cli) — the terminal front-end to the same sessions.