implement-plan

name	implement-plan
description	Implement a plan with phased execution, parallel agents, and verification.
allowed-tools	Read, Grep, Glob, Write, Edit, Bash, Agent

Implement Plan

Executes a structured implementation plan with phased execution and verification.

When to Use

• "Implement the following plan:"
• "Execute this plan"
• User pastes a structured plan with phases/steps

Procedure

Step 1: Parse the Plan

Read the plan and identify:

• Phases — ordered stages
• Files to modify — the specific files listed
• Dependencies — which phases must complete before others start
• Independent work — phases that can run in parallel

Step 2: Read Before Modifying

For each file listed in the plan, read it first to understand current state. Never modify a file you haven't read.

Step 3: Execute Phases

Execute phases in dependency order. Within each phase:

1. Sequential phases: Execute one at a time
2. Parallel phases: Use parallel agents with clear scoped tasks

Each agent must run pnpm typecheck before reporting completion.

Step 4: Verify

After all phases complete:

pnpm typecheck
pnpm lint
pnpm format

Fix any errors before reporting completion.

Step 5: Report

Summarize what was done:

• Files created/modified (grouped by phase)
• Any deviations from the plan and why
• Any follow-up items identified

Guardrails

• If a phase fails, stop and report — don't continue to dependent phases
• If the plan references files that don't exist, check with the user
• Always run typecheck/lint/format before considering done
• Respect existing patterns in each file