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Sweep 22 Oct 2026 · 04:32Z Build v2.1.308 527 read Stable v2.1.308 Latest v2.1.308 Next v2.1.308 Feeds RSS JSON llms.txt llms-full.txt Unofficial

Claude Code v2.1.222 ·

Tool-input string extraction hardened against hostile objects

Reading tool inputs is now hardened so a crafted object cannot run code during extraction.

Under the hood Internal Changes
JSON All of v2.1.222
Under the hoodTier: how much it should matter to you
2Useful: my rating, 1 to 5
0Signal: worth watching, 1 to 5
PermissionsArea: what it touches
Internal ChangesKind: in v2.1.222,
Internal ChangesSection of the release
What

The helper that pulls values like command, file_path, prompt and args out of tool input no longer trusts the shape of the object it is given.

Details
  • Rejects Proxy objects outright.
  • Reads own property descriptors rather than invoking getters, so extraction cannot run attacker code.
  • Bails on array-like values whose length is not a safe integer or exceeds the cap.
Evidence

OYa.types.isProxy(e)

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

See this entry in the whole of v2.1.222 →

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