Implementation Plan

Generate an actionable PLAN.md with phased tasks from whatever context is available — a user-provided description, PRD.md, specs/, or any combination.

Workflow

1. Gather Context

Determine the input sources. Multiple sources can be combined — they are additive, not exclusive.

A) User-provided description: Check if the user provided arguments with the command (e.g., /plan add a notifications system). If so, this is the primary description of what to build.

B) Project docs: Look for PRD.md and specs/README.md in the project root. If found, read them along with any specs/*.md files. These supplement the description with detailed requirements and architecture.

If no description AND no PRD.md exists: Ask the user to describe what they want to build. Do not suggest running other skills — just ask directly:

"What would you like to build? Describe the feature or project and I'll create a plan."

Read all available docs: PRD.md, specs/README.md, and all specs/*.md files (if they exist).

2. Generate PLAN.md

Create PLAN.md at project root:

# Plan: [Title]

## Overview
Brief summary of what we're building and success criteria.

## Architecture Reference
Summary of key architectural decisions. Link to specs/README.md if it exists.

## Tasks

### Phase 1: [Phase Name]
- [ ] **Task title** `[pending]`
  - Spec: specs/component.md#section (if applicable)
  - Scope: What this task covers
  - Acceptance: How we know it's done

### Phase 2: [Phase Name]
...

## Dependencies
External dependencies or prerequisites.

## Open Questions
Unresolved questions that may affect implementation.

---
*Generated on [date]*

Task generation rules:

Create 10-25 tasks organized into logical phases
Each task independently completable
Reference specific spec files where applicable
Include setup/infrastructure tasks at start
Include validation/testing tasks throughout
Status values: pending | in-progress | blocked | done
If working from a brief description, explore the existing codebase to inform task scope and architecture decisions

Open in Typora: open -a Typora PLAN.md

3. Review Plan

If running interactively, ask:

"I've created PLAN.md with [N] tasks across [M] phases. Would you like me to:

Review the plan - Check for gaps and spec coverage

Done - Proceed with the plan as-is"

If review requested, spawn Explore subagent:

Prompt: "Review PLAN.md for completeness. Check:
- Does the plan cover all stated requirements (from PRD.md, specs/, or the overview)?
- Are task dependencies correct and phases logically ordered?
- Are acceptance criteria testable?
- Are there obvious gaps or missing edge cases?

Return: 🔴 Critical gaps, 🟡 Missing coverage, 🟢 Well-covered areas."

Present findings. Ask user what to update. Make requested changes.

If running headless (e.g., via -p flag or as a subagent), skip the review prompt and proceed directly.

4. Next Steps

If running interactively, ask:

"Plan is ready. Would you like me to:

Start implementation - Begin working on the first task

Done - Keep the plan for manual execution"

If running headless, stop after creating PLAN.md. The caller decides what happens next.