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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.

All of v2.1.64 Home All releases olderv2.1.63 v2.1.66newer
Claude Code v2.1.64

InstructionsLoaded Hook Event

What

A new hook event type that fires whenever an instruction file (CLAUDE.md or a rule file) is loaded during a session.

Details
  • Hook receives context about which instruction file was loaded
  • Can be used for auditing, logging, or dynamically responding to instruction changes
  • Follows the same async/sync hook response patterns as other hook events
Evidence

Hook registration (search for "InstructionsLoaded", "When an instruction file (CLAUDE.md or rule) is loaded")

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

Related

Other releases about the same thing. Found by shared names or similar wording; neither means one caused the other.

See this entry in the whole of v2.1.64 →