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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 v2.1.129 5 May 2026

Skill Listing Context Budget Warnings

Claude Code now surfaces when the skill listing sent to Claude is being shortened or truncated to fit the context budget.

Details

The UI can show whether descriptions exceed the per-entry cap.
It suggests /skills to disable skills or skillListingBudgetFraction to allocate more context.
It estimates the extra token cost of opting into a larger skill listing.

Evidence

Skill budget warning UI (search for "Skill listing will be truncated", "skillListingBudgetFraction", and "Opting in would cost ~")

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

See this entry in the whole of v2.1.129 →