You'll noticeTier: how much it should matter to you
3Useful: my rating, 1 to 5
0Signal: worth watching, 1 to 5
SkillsArea: what it touches
New FeaturesKind: in v2.1.221,
New FeaturesSection of the release
What
After the per-target changes are applied, the migrate subcommand tells the model to audit in-scope prompt text, tool descriptions, and request code against shared/prompt-audit.md.
Details
A new Quick Task Reference row routes "is this prompt outdated" and "remove the cruft" questions to the same file.
An HTML comment left in the shipped prompt records that the skill's trigger description was deliberately not changed because it is eval-pinned, so the model sees this developer note as part of its context.
Evidence
TODO(prompt-audit): remaining trigger question
Strings lifted out of the shipped bundle, so the claim above can be checked against them.
Read from
Names in the bundle/claude-api migrate
How sure we are
One source agreesOne thing we can check says the same as this entry.
Anthropic's release notes agreeAdded a prompt-audit subcommand to the claude-api skill for auditing prompts and tool descriptions for patterns written for older models
