## What changed
Remove `SandboxDirectSpawnTransformRequest` and `transform_for_direct_spawn` in favor of `SandboxManager::for_file_system_helpers().transform()`. Keep Windows wrapper preparation specific to filesystem helpers, and return `SandboxUnavailable` when a Windows token sandbox is requested for a filesystem helper on a non-Windows executor.
Record the helper permission entry count during launch policy preparation, before adding runtime read grants.
## Testing
Cover Windows helper executable read access and explicit workspace write grants, including empty workspace roots. Verify rejection of non-native policy working directories and Windows token helper sandboxes on Unix. Extend the helper isolation test to exercise sandboxed writes as well as reads.
GitOrigin-RevId: f95bb94e12d8d7c6e5c773644abb7b59b47ffc4a
## Why
Remote commands can use workspace paths from a different operating system. Preparing them on the client should preserve those paths and command arguments for the execution host.
## What changed
- Build exec-server requests directly, carrying the native command and sandbox context without applying the client's sandbox transform.
- Resolve workspace permissions and runtime read access in `SandboxManager` on the execution host, including helper binaries and validated managed-network CA bundles.
- Add explicit backend selection and required platform sandbox selection, rejecting launches when the required sandbox is unavailable.
## Testing
Extend request tests to cover foreign workspace paths, Unicode arguments, and empty arguments. Extend the remote process test on Unix to verify that restricted reads allow the sandbox helper and validated CA bundle while denying an untrusted certificate file.
GitOrigin-RevId: 5fc02ac4208912ecefb80a212742389afc14ac05
## What changed
Add optional executor workspace roots to `SandboxTransformRequest` and resolve symbolic workspace rules after merging additional permissions. Preserve explicit deny rules and treat an empty root list as granting no workspace access.
Route Windows restricted-token preparation through the shared transform path and use explicit roots when building its direct-spawn wrapper. Update Windows MXC debug launches to bind configured roots before adding the managed CA read grant.
## Testing
Extend sandbox manager tests to cover workspace and subpath expansion, empty root lists, deny preservation, and the roots and write permissions serialized into the Windows wrapper.
GitOrigin-RevId: 0bebdb08b67cbbc182c18b031b9d13a21a799682
## Why
Repository skill discovery must reflect current filesystem access, including newly approved grants and narrower permissions. Previously listed skills can remain in conversation history after a turn-scoped grant expires, so catalog updates need to tell the model when availability changes.
## What changed
- Discover repository skills through the selected executor's permission-aware filesystem accessor and refresh snapshots when the working directory or access changes. Use the current step's snapshot for skill selection and invocation.
- Preserve repository boundaries even when project markers are hidden by read restrictions, and report unsupported sandbox backends as skill-loading errors.
- Track grant-dependent catalog entries and emit availability notices when skills disappear or return, even when the metadata budget is exhausted.
- Resolve implicit skill paths through their owning filesystem and exclude remote repository skills from local implicit command attribution.
## Testing
Add coverage for turn and session grants, grant expiry and restoration, hidden and newly created repository markers, cached read denials on Windows, unsupported remote sandboxes, and executor-backed implicit skill paths.
GitOrigin-RevId: ac1af483e73e3130524aeeabe218630435054028
## Why
Elevated Windows sandbox tests share machine-wide accounts. Running them in the sharded core suite can consume test deadlines while shards wait for the account lock.
## What changed
Move the Windows sandbox tests into the Windows-only `windows_sandbox` integration-test binary. Update the nextest account-sharing group to select the entire binary instead of individual test names, so tests queue before their timeouts start. Keep the existing guard for coordination with other test binaries.
GitOrigin-RevId: 613925c9398b5acc8440fa34c658680f31f65c8b
viyatb-oai