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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 v2.1.219

Left-arrow backgrounding refuses to eat an unsent draft

You'll notice
Useful4 Signal0
Input Editor

Left-arrow no longer backgrounds agents while you have unsent text, so drafts survive.

What

Pressing left-arrow to open or background agents is blocked while there is unsent text in the input box, so a draft is no longer lost to the shortcut.

Details
  • the block shows an explanatory message telling you to send or clear the text, noting that double-tapping esc clears it
  • it emits tengu_left_arrow_blocked with reason draft
  • the editor disarms the pending left-arrow confirmation on any non-left keypress and when history up or down is used
Evidence

you have unsent text in the input. Send it or clear it first (double-tap esc clears)

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 v2.1.219 →