What
Skills are reusable instructions Claude can use. Claude Code tells Claude which skills are available through a skill listing attached to the conversation. Skill listings, called skill_listing attachments, now have an addsToEarlier flag.
- When
addsToEarlieris true, the reminder says the list "adds to the skills listed earlier in this conversation and is not the full list". Before, it always read "The following skills are available". - A later listing that does not add to an earlier one now clears the record of skills already announced. Before, announced names only accumulated and were never cleared.
- As a result, skills are sent to Claude again after a reset.
Why
Claude is told whether a list of skills is complete or only an addition, so it does not mistake a short addition for everything available. After a reset, skills are announced again instead of being left out because they were listed once before.