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

# cac claude

> Claude Code version management.

Manage Claude Code binary versions. Binaries are downloaded from Anthropic's official distribution with SHA256 checksum verification.

## install

Download and install a Claude Code version.

```bash theme={null}
cac claude install latest
cac claude install 2.1.81
```

If the version is already installed, it's a no-op. Downloads show a progress bar.

When you use `-c latest` in `cac env create`, the version is resolved and auto-installed — you don't need to run `install` first.

## ls

List all installed Claude Code versions.

```bash theme={null}
cac claude ls
```

```
Installed Claude Code versions:

  2.1.81 (latest) — 2 environment(s)
  2.1.80

  System: /root/.local/bin/claude (2.1.81)
```

Shows which version is marked as `latest`, how many environments use each version, and the system-installed Claude Code path if present.

## pin

Pin the current active environment to a specific version.

```bash theme={null}
cac claude pin 2.1.81
```

This writes the version to `~/.cac/envs/<name>/version`. The wrapper resolves this file at launch time, so the change takes effect on the next `claude` invocation.

## uninstall

Remove an installed version. Fails if any environment is using it.

```bash theme={null}
cac claude uninstall 2.1.80
```

<Warning>
  You cannot uninstall a version that is pinned by any environment. Remove or re-pin those environments first.
</Warning>