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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 v2.0.54 25 Nov 2025

Smarter Terminal Progress Indicators

What: OSC 9;4 taskbar progress sequences now only emit for terminals that properly support them.

Details:

Enabled for: ConEmu (via ConEmuANSI/ConEmuPID/ConEmuTask env vars) and Ghostty (TERM=xterm-ghostty)
Disabled for: Windows Terminal (WT_SESSION) and non-TTY environments
Prevents garbled output in unsupported terminals
Evidence: New GQ6() function at line 220728, conditional rendering at line 220776

See this entry in the whole of v2.0.54 →