Skill errors and permission prompts drop their hints about a skill's old name

What

A skill is a packaged set of instructions Claude can load and run by name. Two messages that helped when a skill was called by a name it no longer uses are gone:

• Unknown-skill error: when Claude asks for a skill that does not exist, the error no longer suggests "a skill from the user's claude.ai account" under that skill's former namespace. It still suggests a close match, meaning a name that differs by at most two characters. It may now also add text built from plugin load errors and the list of enabled plugins.
• Skill permission prompt: the "renamed" case is removed. When checking whether to ask you, the Skill tool no longer looks for an allow rule that names a skill's former name. It used to say that a rule like Skill(old) covers the skill's old name, give the new name, and tell you to add Skill(new) to allow it without asking.

Why

If your permission rules still name a skill by its old name, Claude Code no longer tells you to update them, so you may be asked for permission without an explanation. When a plugin's skill fails to load, the unknown-skill error can now tell Claude about plugin loading problems instead of only saying the skill is unknown.