Synced skills are now referenced by an anthropic-skills: identifier instead of a GitHub URL
Skills (packaged sets of instructions Claude Code can use for a task) that are synced rather than local used to be identified by a GitHub URL. They are now identified by an anthropic-skills:<name> identifier instead, with matching logic to strip that prefix back off when needed.
Synced skills can have bare names that aren't guaranteed to be unique, so they can't be safely checked for naming collisions the way local skills are. Giving them a qualified anthropic-skills: identifier avoids that ambiguity.
The entry above is what we published on the day. These lines were added later, as Anthropic's own pages caught up, and they sit beside the original rather than replacing it.
| Any of the above and a skill [synced from your claude.ai account](#how-synced-skills-behave) | The other skill or command. The synced skill still runs as `/anthropic-skills:<name>`. See [When a synced skill name matches another command](…skills see the edit
Anthropic's documentation has since written up anthropic-skills:, on Extend Claude with skills.
Changed skills synced from claude.ai in cloud sessions to be named anthropic-skills:<name>, matching Claude Desktop; the bare name still…