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Sweep 06 Nov 2026 · 01:32Z Build v2.1.319 537 read Stable v2.1.311 Latest v2.1.318 Next v2.1.319 Feeds RSS JSON llms.txt llms-full.txt Unofficial
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Claude Code v2.1.319 ·

Skill files claude.ai would not save can be refused before upload

Behind tengu_sorted_thimble, SKILL.md or .skill attachments that claude.ai would refuse to save are not sent, with an error saying why

Group of 2 You'll notice Improvements
JSON All of v2.1.319
You'll noticeTier: how much it should matter to you
1Useful: my rating, 1 to 5
2Signal: worth watching, 1 to 5
SkillsArea: what it touches
ImprovementsKind: in v2.1.319,
ImprovementsSection of the release

Unclear It is not clear when this check is switched on.

What

A skill is a packaged set of instructions Claude can use, stored in a SKILL.md or .skill file. When Claude Code sends attachments to claude.ai through its bridge (the link between your terminal and claude.ai), it can now hold back a skill file that claude.ai would refuse to save as a skill.

  • With the new refuseUnsaveableSkills option, such a file is not sent, and the upload error says: "not sent: claude.ai would refuse to save it as a skill".
  • The option is passed to the attachment and caption flow, and is set only when a helper check returns true and the server switch tengu_sorted_thimble is on. The built-in fallback for that switch is false.

Nothing has been read about tengu_sorted_thimble, so whether it is on for anyone is unknown.

Why

Where the guard is active, a skill file that would have failed on claude.ai is stopped early with a clear reason, instead of being uploaded and then rejected.

How sure we are
Something disagreesSomething we can check disagrees with this entry, or the writer said they could not settle it.
The writer flagged doubtIt is not clear when this check is switched on.

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