Skill Trainer

Build, test, and deploy Copilot CLI skills. Use when creating a new skill, improving an existing skill, testing skills with subagents, deploying skills to a repo, or learning skill development patterns.

Guide MCP server design for agent consumption: tool descriptions, naming, knowledge tools, annotations. USE FOR: writing tool descriptions, naming tools, designing knowledge endpoints, reviewing MCP server design, adding tool annotations. DO NOT USE FOR: building skills that consume MCP tools (use skill-builder), MCP protocol implementation details.

Institutional knowledge for skill training — frontmatter rules, INVOKES patterns, stop signals, token budgets, anti-patterns, and eval integration. USE FOR: looking up skill-building conventions, understanding training methodology, creating Arena eval requests, checking external reference sources. DO NOT USE FOR: actually training a skill (use SkillTrainer agent), creating new skills from scratch (use skill-builder). INVOKES: no tools — pure knowledge skill.