The internal list of "Claude-aware" environment variables has been expanded from a small set to over 80 named variables. This list is used by the hooks system to determine which env vars hooks may set or modify.
A new secondary set (Lvh) covers privacy-sensitive variables (DISABLE_TELEMETRY, DO_NOT_TRACK, DISABLE_ERROR_REPORTING, CLAUDE_CODE_DISABLE_NONESSENTIAL_TRAFFIC) that hooks may only write when the caller has elevated trust.
This does not change how users configure Claude Code; it tightens the security boundary around which env vars hooks can inject.
Evidence
Expanded allowlist (search for "CLAUDE_CODE_DISABLE_BUNDLED_SKILLS" in env var set)
Strings lifted out of the shipped bundle, so the claim above can be checked against them.