Code-writing and execution skills for the Han suite. Home of the tdd skill, which drives a feature or behavior through a BDD-framed red-green-refactor loop with an enforced observed-failure gate. Depends on han-core and han-communication; bundled by the han meta-plugin.

Pre-planning knowledge-work skills for the Han suite: understanding a problem before anyone commits to a plan. Home of research, gap-analysis, and issue-triage, plus the research-analyst agent. Depends on han-communication and han-core; bundled by the han meta-plugin.

37 advanced engineering skills: agent designer, agent workflow designer, RAG architect, database designer + schema designer + SQL assistant, migration architect, observability designer, dependency auditor, changelog generator (with semantic version bumper and hotfix/rollback procedures), API design reviewer, API test suite builder, CI/CD pipeline builder, MCP server builder, skill security auditor

Foundational communication plugin for the Han suite. Owns the canonical readability standard, writing-voice profile, and explanation standard, the readability-guidance skill that surfaces the first two into a calling skill's context for in-voice drafting, the explanation-guidance skill that surfaces the third at the point a run talks to a person, the readability-editor agent that runs the adversar