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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 v2.1.3 9 Jan 2026

Refactored Notification System

The terminal notification system was refactored with cleaner abstractions. Notifications now use dedicated handler functions (sendITerm2, sendKitty, sendGhostty, sendBell) instead of inline escape sequences, making the code more maintainable and easier to extend.

Evidence

gd() at line 367233 (new notification dispatcher using FT5), FT5() at line 367243 (notification router with B.sendITerm2(Q), B.sendKitty(...), etc.), HT5() at line 367266 (auto-detection handler)

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

See this entry in the whole of v2.1.3 →