Skills, slash commands and AskUserQuestion #27

Do. Load .claude/skills/*/SKILL.md and ~/.agents/skills with progressive disclosure (name + description up front, body on demand). Expand /name from .claude/commands/*.md with $ARGUMENTS. An AskUserQuestion tool (input.questions) — AgentMux's question panel already renders it. AgentMux already writes the skill and command files.

Spec §6.4.

Spec: SPEC_MUXCODE_HARNESS_AND_FEATURE_GAPS_2026_09_26.md