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name: writing-plans description: Create detailed implementation plans with bite-sized tasks for engineers with zero codebase context user-invocable: false disable-model-invocation: true when_to_use: when design is complete and you need detailed implementation tasks for engineers with zero codebase context version: 2.2.0 progressive_disclosure: level: 1 references: - path: references/plan-structure-templates.md title: Plan Structure & Templates description: Standard headers, task templates, and structure examples - path: references/best-practices.md title: Best Practices & Guidelines description: Writing for zero-context engineers, code completeness, test design patterns

Writing Plans

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/plans/YYYY-MM-DD-<feature-name>.md

Quick Reference

Plan header template: See Plan Structure & Templates

Task template: See Plan Structure & Templates

Granularity guide: Each step = 2-5 minutes. See Best Practices

Core Principles

• Exact file paths always - Not "in the user module" but "src/models/user.py"
• Complete code in plan - Not "add validation" but show the validation code
• Exact commands with expected output - "pytest tests/file.py -v" with what you'll see
• Reference relevant skills - Use @ syntax: @skills/category/skill-name
• DRY, YAGNI, TDD, frequent commits - Every task follows this pattern

For detailed guidance: Best Practices & Guidelines

Execution Handoff

After saving the plan, offer execution choice:

"Plan complete and saved to docs/plans/<filename>.md. Two execution options:

1. Subagent-Driven (this session) - I dispatch fresh subagent per task, review between tasks, fast iteration

2. Parallel Session (separate) - Open new session with executing-plans, batch execution with checkpoints

Which approach?"

If Subagent-Driven chosen:

• Use @skills/collaboration/subagent-driven-development
• Stay in this session
• Fresh subagent per task + code review

If Parallel Session chosen:

• Guide them to open new session in worktree
• New session uses @skills/collaboration/executing-plans

Remember

• Write for zero-context engineers (specify everything)
• Complete code blocks, not instructions
• Exact commands with expected output
• Test first, then implement, then commit
• Reference existing patterns in codebase
• Keep tasks bite-sized (2-5 minutes each)

Need examples? See Plan Structure & Templates for complete task examples.

Need patterns? See Best Practices for error handling, logging, test design, and more.