v1.8.7

Added

• Q16 audit check — new skill quality check detects allowed-tools declaring external CLI tools (not git/python/node/npm/npx/bash or bin//scripts/ paths) without a ## Prerequisites section in the SKILL.md body
• Prerequisites writing guide — skill-writing-guide.md now includes a "Prerequisites Writing" section with standard table format and agent behavior for required vs optional tools
• Overview writing guide — skill-writing-guide.md adds an "Overview Writing" section with three-element template (purpose, core principle, skill type)
• Missing dependency handling — external-integration.md documents the required/optional tool detection pattern for skills with external CLI dependencies

Changed

• Authoring step 8 expanded — external dependency check now includes Prerequisites section guidance alongside declaration syntax
• Skill structure order updated — recommended section order in skill-writing-guide.md now places Prerequisites between Overview and Entry Detection