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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 v2.1.81

SessionStart Hook initialUserMessage Field

What

The SessionStart hook event input now includes an optional initialUserMessage field containing the first user message.

Details
  • Allows hooks to access the initial prompt text at session start
  • Useful for hooks that need to adjust behavior based on what the user asked
Evidence

SessionStart hook field (search for "initialUserMessage")

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

See this entry in the whole of v2.1.81 →