Claude Code v2.1.280 · 22 Sep 2026
Builtin hooks-module capability manifests expanded
Builtin plugin hook modules were granted access to more host calls, including two new environment variables
Under the hood Tier: how much it should matter to you
2 Useful: my rating, 1 to 5
2 Signal: worth watching, 1 to 5
Plugins Area: what it touches
Internal Changes Kind: in v2.1.280, 22 Sep 26
Internal Changes Section of the release
What
Internal manifests that declare which host functions a builtin plugin's hook module is allowed to call were expanded:
Why
This widens what these builtin hook modules are permitted to do internally, giving them access to session usage info, settings, and a couple more environment variables relevant to attachment handling and simple/bare mode.
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Names in this entry
setting env.get Plugins and hooks gain new permission scopes: session.usage, settings.read, env.get, env.set
setting session.usage Plugins and hooks gain new permission scopes: session.usage, settings.read, env.get, env.set
setting settings.read Plugins and hooks gain new permission scopes: session.usage, settings.read, env.get, env.set
env HOME Remote settings can now supply many more environment variables, including auth tokens and home directory paths.
env USERPROFILE Working-tree upload now refuses linked worktrees and checkouts sitting in temporary scratch directories.
env CLAUDE_CODE_DISABLE_ATTACHMENTS Set to 1 to disable attachment processing. File mentions with @ syntax are sent as plain text instead of being expanded into file content
env CLAUDE_CODE_SIMPLE When a coordinator agent cannot use a tool, Claude is told to run it from a worker.
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Related
Other releases about the same thing. Found by shared names or similar wording; neither means one caused the other.
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New plugin file-watcher with debounce/burst/storm reload logic
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Addon search-hint text can now be a lazy function
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