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A skill is a reusable set of instructions that teaches Sixth how to do something specific: a release process, a document format, a testing routine, a design style. Skills load only when they’re needed, so you can install many of them without bloating every request.

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How skills work

  • Sixth always knows each installed skill’s name and description.
  • When a request matches a skill, or you ask for one directly, Sixth loads that skill’s full instructions with the use_skill tool and follows them.
  • To call a skill yourself, type / followed by its name in the chat, for example /release-notes. Skills appear in the / menu.

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Skill folders

Each skill is a folder with a SKILL.md file. Optional scripts/, references/ and assets/ folders can hold supporting files.
SKILL.md starts with YAML frontmatter, followed by the instructions in markdown:
Sixth loads skills from ~/.claude/skills/ in your home folder. The same skills are available in every project.

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Managing skills

Click the Rules & Workflows button (the scales icon) in the message box toolbar and open the Skills tab. There you can:
  • See every available skill under Available Skills, with its description.
  • Switch a skill off to stop Sixth from using it, or back on.
  • Create with AI: start a task where Sixth helps you design a new skill and writes the whole folder into ~/.claude/skills/.
  • Create Manually: start a task where Sixth shows you the SKILL.md format and walks you through setting up the folder yourself.

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The skill-creator skill

Sixth installs a built-in skill-creator skill, marked built-in in the list. It guides the creation of new skills and can’t be switched off.
A good description matters most. Sixth decides when to load a skill from its description, so say what the skill does and when to use it.