Writing Plans

CRITICAL CONSTRAINTS — Read Before Anything Else

You MUST NOT call EnterPlanMode or ExitPlanMode at any point during this skill. This skill operates in normal mode and manages its own completion flow via AskUserQuestion. Calling EnterPlanMode traps the session in plan mode where Write/Edit are restricted. Calling ExitPlanMode breaks the workflow and skips the user's execution choice. If you feel the urge to call either, STOP — follow this skill's instructions instead.

Overview

Write comprehensive implementation plans assuming the engineer has zero context for our codebase and questionable taste. Document everything they need to know: which files to touch for each task, code, testing, docs they might need to check, how to test it. Give them the whole plan as bite-sized tasks. DRY. YAGNI. TDD. Frequent commits.

Assume they are a skilled developer, but know almost nothing about our toolset or problem domain. Assume they don't know good test design very well.

Announce at start: "I'm using the writing-plans skill to create the implementation plan."

Context: This should be run in a dedicated worktree (created by brainstorming skill).

Save plans to: docs/superpowers/plans/YYYY-MM-DD-<feature-name>.md

• (User preferences for plan location override this default)

Scope Check

If the spec covers multiple independent subsystems, it should have been broken into sub-project specs during brainstorming. If it wasn't, suggest breaking this into separate plans — one per subsystem. Each plan should produce working, testable software on its own.

File Structure

Before defining tasks, map out which files will be created or modified and what each one is responsible for. This is where decomposition decisions get locked in.

• Design units with clear boundaries and well-defined interfaces. Each file should have one clear responsibility.
• You reason best about code you can hold in context at once, and your edits are more reliable when files are focused. Prefer smaller, focused files over large ones that do too much.
• Files that change together should live together. Split by responsibility, not by technical layer.
• In existing codebases, follow established patterns. If the codebase uses large files, don't unilaterally restructure - but if a file you're modifying has grown unwieldy, including a split in the plan is reasonable.

This structure informs the task decomposition. Each task should produce self-contained changes that make sense independently.

REQUIRED FIRST STEP: Initialize Task Tracking

BEFORE exploring code or writing the plan, you MUST:

1. Call TaskList to check for existing tasks from brainstorming
2. If tasks exist: you will enhance them with implementation details as you write the plan
3. If no tasks: you will create them with TaskCreate as you write each plan task

Do not proceed to exploration until TaskList has been called.

TaskList

Task Granularity

Each task is a coherent unit of work that produces a testable, committable outcome.

See skills/shared/task-format-reference.md for the full granularity guide.

Key principle: TDD cycles happen WITHIN tasks, not as separate tasks. A task is "Implement X with tests" — the red-green-refactor steps are execution detail inside the task, not task boundaries.

Scope test:

1. Can it be verified independently? (if no → too small)
2. Does it touch more than one concern? (if yes → too big)
3. Would it get its own commit? (if no → merge with adjacent task)

Plan Document Header

Every plan MUST start with this header:

# [Feature Name] Implementation Plan

> **For agentic workers:** REQUIRED SUB-SKILL: Use superpowers-extended-cc:subagent-driven-development (recommended) or superpowers-extended-cc:executing-plans to implement this plan task-by-task. Steps use checkbox (`- [ ]`) syntax for tracking.

**Goal:** [One sentence describing what this builds]

**Architecture:** [2-3 sentences about approach]

**Tech Stack:** [Key technologies/libraries]

---

Task Structure

### Task N: [Component Name]

**Goal:** [One sentence — what this task produces]

**Files:**
- Create: `exact/path/to/file.py`
- Modify: `exact/path/to/existing.py:123-145`
- Test: `tests/exact/path/to/test.py`

**Acceptance Criteria:**
- [ ] [Concrete, testable criterion]
- [ ] [Another criterion]

**Verify:** `exact test command` → expected output

**Steps:**

- [ ] **Step 1: Write the failing test**

```python
def test_specific_behavior():
    result = function(input)
    assert result == expected
```

- [ ] **Step 2: Run test to verify it fails**

Run: `pytest tests/path/test.py::test_name -v`
Expected: FAIL with "function not defined"

- [ ] **Step 3: Write minimal implementation**

```python
def function(input):
    return expected
```

- [ ] **Step 4: Run test to verify it passes**

Run: `pytest tests/path/test.py::test_name -v`
Expected: PASS

- [ ] **Step 5: Commit**

```bash
git add tests/path/test.py src/path/file.py
git commit -m "feat: add specific feature"
```

No Placeholders

Every step must contain the actual content an engineer needs. These are plan failures — never write them:

• "TBD", "TODO", "implement later", "fill in details"
• "Add appropriate error handling" / "add validation" / "handle edge cases"
• "Write tests for the above" (without actual test code)
• "Similar to Task N" (repeat the code — the engineer may be reading tasks out of order)
• Steps that describe what to do without showing how (code blocks required for code steps)
• References to types, functions, or methods not defined in any task

Remember

• Exact file paths always
• Complete code in every step — if a step changes code, show the code
• Exact commands with expected output
• DRY, YAGNI, TDD, frequent commits

Self-Review

After writing the complete plan, look at the spec with fresh eyes and check the plan against it. This is a checklist you run yourself — not a subagent dispatch.

1. Spec coverage: Skim each section/requirement in the spec. Can you point to a task that implements it? List any gaps.

2. Placeholder scan: Search your plan for red flags — any of the patterns from the "No Placeholders" section above. Fix them.

3. Type consistency: Do the types, method signatures, and property names you used in later tasks match what you defined in earlier tasks? A function called clearLayers() in Task 3 but clearFullLayers() in Task 7 is a bug.

If you find issues, fix them inline. No need to re-review — just fix and move on. If you find a spec requirement with no task, add the task.

Execution Handoff

Your ONLY permitted next action is calling AskUserQuestion with this EXACT structure:

AskUserQuestion:
  question: "Plan complete and saved to docs/superpowers/plans/<filename>.md. How would you like to execute it?"
  header: "Execution"
  options:
    - label: "Subagent-Driven (this session)"
      description: "I dispatch fresh subagent per task, review between tasks, fast iteration"
    - label: "Parallel Session (separate)"
      description: "Open new session in worktree with executing-plans, batch execution with checkpoints"

If you are about to call ExitPlanMode, STOP — call AskUserQuestion instead.

If Subagent-Driven chosen: Invoke the Skill tool: superpowers-extended-cc:subagent-driven-development

• The skill handles everything: subagent dispatch, review, task tracking
• You stay in this session as the coordinator
• Do NOT start working on tasks directly

If Parallel Session chosen: Guide the user to open a new session in the worktree, then invoke: superpowers-extended-cc:executing-plans

---

Native Task Integration Reference

Use Claude Code's native task tools (v2.1.16+) to create structured tasks alongside the plan document.

Creating Native Tasks

For each task in the plan, create a corresponding native task. Embed metadata as a json:metadata code fence at the end of the description — this is the only way to ensure metadata survives TaskGet (the metadata parameter on TaskCreate is accepted but not returned by TaskGet).

TaskCreate:
  subject: "Task N: [Component Name]"
  description: |
    **Goal:** [From task's Goal line]

    **Files:**
    [From task's Files section]

    **Acceptance Criteria:**
    [From task's Acceptance Criteria]

    **Verify:** [From task's Verify line]

    **Steps:**
    [Key actions from task's Steps — abbreviated]

    ```json:metadata
    {"files": ["path/to/file1.py"], "verifyCommand": "pytest tests/path/ -v", "acceptanceCriteria": ["criterion 1", "criterion 2"]}
    ```
  activeForm: "Implementing [Component Name]"

Why Embedded Metadata

The metadata parameter on TaskCreate is accepted but not returned by TaskGet. Embedding it as a json:metadata code fence in the description ensures:

• TaskGet returns the full metadata (it's part of the description)
• Cross-session resume can parse it from .tasks.json
• Subagent dispatch can extract it for implementer prompts

See skills/shared/task-format-reference.md for the full metadata schema.

Setting Dependencies

After all tasks created, set blockedBy relationships:

TaskUpdate:
  taskId: [task-id]
  addBlockedBy: [prerequisite-task-ids]

During Execution

Update task status as work progresses:

TaskUpdate:
  taskId: [task-id]
  status: in_progress  # when starting

TaskUpdate:
  taskId: [task-id]
  status: completed    # when done

---

Task Persistence

At plan completion, write the task persistence file in the same directory as the plan document.

If the plan is saved to docs/superpowers/plans/2026-01-15-feature.md, the tasks file MUST be saved to docs/superpowers/plans/2026-01-15-feature.md.tasks.json.

{
  "planPath": "docs/superpowers/plans/2026-01-15-feature.md",
  "tasks": [
    {
      "id": 0,
      "subject": "Task 0: ...",
      "status": "pending",
      "description": "**Goal:** ...\n\n**Files:**\n...\n\n```json:metadata\n{\"files\": [\"path/to/file.py\"], \"verifyCommand\": \"pytest tests/ -v\", \"acceptanceCriteria\": [\"criterion 1\"]}\n```"
    },
    {
      "id": 1,
      "subject": "Task 1: ...",
      "status": "pending",
      "blockedBy": [0],
      "description": "**Goal:** ...\n\n```json:metadata\n{\"files\": [], \"verifyCommand\": \"\", \"acceptanceCriteria\": []}\n```"
    }
  ],
  "lastUpdated": "<timestamp>"
}

Both the plan .md and .tasks.json must be co-located in docs/superpowers/plans/.

Resuming Work

Any new session can resume by running:

/superpowers-extended-cc:executing-plans <plan-path>

The skill reads the .tasks.json file and continues from where it left off.