Reusable prompt and tool bundles your workspace can attach to any chat.
A skill packages a whole working method and a set of allowed tools into something reusable. Instead of re-explaining a procedure every time, you attach the skill and the agent already follows it step by step, and only touches the tools that skill is permitted to use.
The built-in skills carry real methods, not one-line prompts. Brainstorming holds a design gate — it asks one question at a time and will not start building until you have approved a plan. Systematic Debugging finds the root cause before proposing any fix. Frontend Design works from a proper design plan and avoids the generic AI look. Autonomous Loop works a long task in verified passes and stops when it is genuinely done or genuinely blocked. Spec-Driven Development and a QA harness generator round out the set.
Skills are workspace-scoped too, so a team can build its own library on top of the built-ins, and each one declares which tools it may use rather than inheriting everything.