You'll noticeTier: how much it should matter to you
3Useful: my rating, 1 to 5
3Signal: worth watching, 1 to 5
Output SafetyArea: what it touches
ImprovementsKind: in v2.1.239,
ImprovementsSection of the release
What
A new sanitiser removes control, format, surrogate, private-use and unassigned characters, the line and paragraph separators, and default-ignorable code points from text Claude Code prints. Emoji joiners and newlines are kept depending on the context. A file path too mangled to sanitise is now hidden entirely rather than printed. No flag; this applies to everyone on this build.
Details
Covers plugin manifest fields (displayName, description, author, homepage, license, keywords), all claude plugin console output, the /plugin browser, marketplace listings, notebook cell ids and sources, file paths, and MCP elicitation labels.
Evidence
Path hidden (unsupported characters)
Strings lifted out of the shipped bundle, so the claim above can be checked against them.
