brief

name	brief
description	Research an issue or task and produce a visual HTML briefing with problem breakdown, architecture diagram, and implementation plan.

Brief

Produce a concise, visual HTML briefing for a feature or bug. The output is a self-contained .html file the user opens in a browser.

Input

The user provides an issue number, a topic, or a description. Examples:

• /riff:brief 586
• /riff:brief refactor the data pipeline
• /riff:brief why is grad_norm NaN

Process

1. Gather context: Read the GitHub issue (if number given via gh issue view), then read the relevant source files. Understand current state before proposing changes.
2. Create workspace: Ensure .workspace/{id}-{slug}/ exists (create if not). The .workspace/ directory must be in .gitignore — add it if missing.
3. Write brief.html in the workspace folder.

Output Structure

The HTML must contain these sections in order:

1. Title + subtitle — issue number (if any) and one-line summary
2. Current Architecture — ASCII diagram (inside <div class="diagram">) showing how the relevant components connect today
3. Status Box — what to KEEP, CHANGE, ADD, REMOVE (use .keep/.change/.add/.remove classes)
4. Problem Breakdown — each problem tagged with priority badges (.tag-p1 through .tag-p4), a table or code snippet illustrating the issue
5. Implementation Plan — table with Phase, Change, Risk, Effort columns
6. What We Keep — explicit non-goals to prevent scope creep
7. Related Issues — connections to other open issues (if any)

Style

Use the Tokyo Night dark theme. Inline the full CSS from templates/style.css (in the plugin root) as a <style> block — the HTML must be fully self-contained.

Available CSS classes: .tag-p1–.tag-p4, .status-box, .diagram, .keep/.change/.add/.remove, .callout, .subtitle, .footer.

Rules

• HTML only, self-contained, no external resources
• Concise — each problem section 1–3 paragraphs max, prefer tables and code over prose
• lang="zh-CN" — explanatory text in Chinese, technical terms in English
• Footer: {project} / {identifier} / .workspace/{folder}/brief.html
• After writing the file, tell the user the path so they can open it