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Sweep 22 Oct 2026 · 21:04Z Build v2.1.309 528 read Stable v2.1.308 Latest v2.1.309 Next v2.1.309 Feeds RSS JSON llms.txt llms-full.txt Unofficial

Claude Code v2.1.251 ·

Invisible character runs in file output are withheld rather than displayed

File output with long runs of invisible characters is withheld instead of printed.

You'll notice New Features
JSON All of v2.1.251
You'll noticeTier: how much it should matter to you
3Useful: my rating, 1 to 5
3Signal: worth watching, 1 to 5
File ToolsArea: what it touches
New FeaturesKind: in v2.1.251,
New FeaturesSection of the release
What

Text shown by Grep, Read and related tools passes through a sanitizer that caps how many invisible and variation-selector characters can run together on one line. If the text would have to be altered, it is shown as withheld content with a marker instead of being printed verbatim, which blocks hidden instructions smuggled into files.

Details
  • runs on all matched file content, unconditionally
  • the marker stands in place of the offending text so you can see something was suppressed
Evidence

kind: "withheld", marker: lO(lU)

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

See this entry in the whole of v2.1.251 →

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