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DisclaimerUnofficial, and not affiliated with Anthropic. Nearly all of this is read straight out of what ships: npm bundles, captured prompts, published docs. Anthropic's own notes go in verbatim, marked as theirs. The rest is my reading, and every entry carries the strings behind it. If one looks wrong, vote it down and say why.

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Claude Code v2.1.196 29 Jun 2026

Windows Sandbox ACL — Per-Process Ownership

The Windows file-deny ACL stamp now accepts a --holder-pid flag that associates the stamp with a specific process ID. When the holder process exits, the ACL can be cleaned up rather than persisting for the entire session group.

Details

gta() (ACL stamp) and poo() (ACL restore) both pass --holder-pid <pid> to the srt-win acl helper.
Changing the Windows sandbox group still requires reset() and re-initialize().
If the file-deny set changes mid-session, a warning is logged noting that the change cannot be applied without a reset.

Evidence

New flag (search for "--holder-pid")

Strings lifted out of the shipped bundle, so the claim above can be checked against them.

See this entry in the whole of v2.1.196 →