Writing Implementation Plans

Core Principle

Write plans assuming the engineer has zero codebase context.

Document everything: which files to touch, complete code (not "add validation"), how to test, verification commands with expected output.

Plan Structure for Delegations

When delegating to a sub-agent, structure the prompt as:

## Task: [Clear Task Name]

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

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