landstrip 0.8.3

Sandbox for coding agents with parametrized state
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# landstrip

`landstrip` runs a command in an OS-level sandbox using Landlock LSM on Linux,
Seatbelt on macOS, and LPAC AppContainer on Windows.  It accepts the Anthropic
Sandbox Runtime JSON subset as the policy.

Backends compared:

| Area         | macOS                    | Linux                        | Windows                         |
| ------------ | ------------------------ | ---------------------------- | ------------------------------- |
| Policy       | path based rules         | file based rules             | access control list (ACL)       |
| Timing       | dynamic subset of paths  | file based static ruleset    | persistent ACLs                 |
| TCP          | localhost proxy ports    | loopback proxy ports         | unsupported                     |
| Unix sockets | allowlist                | allowlist via seccomp broker | unsupported                     |

Windows uses an AppContainer. The backend grants the generated AppContainer SID
access to the lowered read and write roots, so Windows policies must use
explicit read allowlists. Fine-grained TCP and Unix socket policies are rejected
until Windows enforcement exists.

## Network Policy

Sandbox mode denies direct network access by default. Proxy ports, local binding,
and Unix sockets can be allowed with the Anthropic Sandbox Runtime network fields.

For a filesystem-only sandbox with unrestricted direct network access, set:

```json
{
  "network": {
    "allowNetwork": true
  }
}
```

On Linux and macOS, `allowNetwork` disables landstrip network enforcement while
leaving filesystem policy enforcement in place. Windows rejects unrestricted
network policies until Windows network support exists.

## Licensing

`landstrip` is licensed under `LGPL-2.1-or-later`.