gat-plan

Plan

This skill writes for one milestone:

• production/milestone-xx-name/tasks.md
• production/milestone-xx-name/tech.md
• production/milestone-xx-name/art-prompts.md

Phase 1: Validate Inputs

Fail if any of these are missing:

• design/gdd/game.md
• design/gdd/systems-index.md
• production/milestone.md

Read:

• design/gdd/game.md
• design/gdd/systems-index.md
• all existing design/gdd/*.md except game.md and systems-index.md
• design/art/art-direction.md if exists
• all existing design/art/*-art.md
• production/milestone.md
• .claude/docs/templates/plan/tasks.md
• .claude/docs/templates/plan/tech.md
• .claude/docs/templates/plan/art-prompts.md

Resolve the target milestone:

• If argument identifies a milestone, use it
• Otherwise choose the first milestone directory that lacks tasks.md
• If all have tasks.md, choose the first lacking tech.md

Stop if no milestone can be resolved.

Read existing milestone files if present:

• production/milestone-xx-name/tasks.md
• production/milestone-xx-name/tech.md
• production/milestone-xx-name/art-prompts.md

Phase 2: Spawn Planner

Spawn gat-planner agent to write tasks.md:

• Pass game overview, systems index, system GDDs, milestone roadmap
• Pass selected milestone identity and directory
• Pass tasks template and existing tasks.md if any
• Instruction: define build order, create small programmer-owned tasks, make dependencies explicit, include verification notes per task

Phase 3: Spawn Programmer and Artist in Parallel

After planner finishes, spawn both:

gat-programmer agent → write tech.md:

• Pass game overview, systems index, system GDDs, milestone roadmap
• Pass the newly written tasks.md
• Pass tech template and existing tech.md if any
• Instruction: describe milestone-level architecture, per-system technical breakdowns, testing focus, known limitations

gat-artist agent → write art-prompts.md:

• Pass game overview, systems index, system GDDs
• Pass art-direction.md and system art docs
• Pass milestone roadmap and selected milestone
• Pass art-prompts template and existing art-prompts.md if any
• Instruction: produce named prompt entries with style anchors, main prompt, negative prompt where useful

Phase 4: Review

Summarize: milestone planned, task count, tech systems covered, prompt entries added.

Use AskUserQuestion:

• Implement first task (Recommended) → Run /gat-implement
• Stop here