You'll noticeTier: how much it should matter to you
2Useful: my rating, 1 to 5
1Signal: worth watching, 1 to 5
Terminal UIArea: what it touches
ImprovementsKind: in v2.1.323,
ImprovementsSection of the release
What
Some text contains invisible characters: characters that take up no space on screen but are still part of the message. Claude Code now shows each one in a message as a code such as \u{200B}, instead of displaying it as nothing.
A dim line under the message says how many there are, for example: "This message's body has 1 invisible character shown as \u{…}. The model reads it." Before, the message showed as plain text and these characters could not be seen.
Why
Hidden characters can be used to slip instructions to the model that a person cannot see, which is a kind of prompt injection. Showing them lets you notice text that would otherwise reach the model unseen.
