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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 v2.1.238

Output style is attached only when the style actually loads

You'll notice
Useful3 Signal2
Output Styles

A broken output style is no longer attached to your conversation as if it had loaded.

What

A non-default output style was previously attached to the conversation using the name written in config, even if the style definition failed to load. Now nothing is attached when the load fails, and when it succeeds the attachment carries the loaded style's own name rather than the config string.

Evidence

output_style

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 v2.1.238 →