What problem does it solve? Writing Codex plugin agents requires precise frontmatter fields, triggering descriptions with examples, and well-structured system prompts, and mistakes in any of these cause agents to fail to trigger or behave unpredictably. ## Core Features & Use Cases - Agent File Authoring: Defines the complete Markdown agent format including name, description, model, color, and tools frontmatter fields with validation rules. - Triggering Design: Provides description patterns with 2-4 example blocks so agents activate under the right conditions. - System Prompt Templates: Supplies structured prompt templates covering responsibilities, process steps, output formats, and edge cases. - Use Case: When building a code-review plugin, use this Skill to generate a code-reviewer agent file with valid frontmatter, triggering examples, and a complete system prompt, then validate it with the included scripts. ## Quick Start Create a Codex plugin agent named code-reviewer with proper frontmatter, triggering examples, and a structured system prompt.