2026-09-26 · 2 min read
Installed a skill? Remember to keep it current
A correction in official skill documentation offers a reason to revisit the skills you use, check their updates and keep a repeatable test.
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A skill’s instructions can need corrections too
A September 24 change in Anthropic’s skills repository corrected two statements about refusal billing in the claude-api skill and pointed readers to official documentation. This is a correction to the skill’s reference material, not an announcement of a model price increase. Skills can contain version assumptions, interface details and pricing rules alongside reusable techniques. Revisit frequently used ones, especially when their instructions affect costs or operational decisions.
Update one familiar skill first
The Vercel skills CLI documents npx skills list for reviewing installed skills and npx skills update <name> for updating a specified skill. Read the author’s changes first, then repeat a familiar task after updating and compare the result. That makes the update easier to assess than changing an entire workflow at once.
Make a web check leave evidence
Anthropic’s webapp-testing skill provides guidance for using Playwright with local web applications, including checking frontend functionality, investigating behaviour, taking screenshots and collecting browser logs. It is a candidate for turning “the page looks usable” into checks of specific buttons and flows. This is a description of its documentation, not a claim that we have tested every capability.