implement

Implement: Execute the Plan

Phase 3 of the Explore → Plan → Implement → Verify workflow.

Process

1. Read the plan: Check .claude/plans/ for the most recent plan
2. Validate before executing: Before making changes: a. Confirm all target files from the plan exist (ls or Glob) b. If the plan involves destructive/batch changes, dry-run first where possible c. If a target file doesn't exist or has changed unexpectedly, stop and update the plan
3. Execute step by step: For each change listed in the plan: a. Make the change b. Quick sanity check: does the file still make sense? c. Scope check: did you change ONLY what the plan specified?
4. Verify: Run the verification method specified in the plan
5. Report: Show evidence of success

Rules During Implementation

• Follow the plan. If the plan is wrong, update it first — don't silently deviate.
• One change at a time. Don't batch unrelated changes into a single edit.
• If you discover something unexpected: stop, report it, adjust the plan.
• After each step, mentally check: "Am I still within scope?"
• Don't add anything the plan doesn't specify. No bonus refactoring.

After Implementation

Run the verification step from the plan. Show output.

IMPLEMENTATION COMPLETE
=======================
Plan: {plan name}
Steps completed: {X}/{Y}
Verification: {PASS/FAIL}
Evidence: {one-line summary of proof}

If verification fails: diagnose, fix, re-verify. Don't mark done until it passes. If the plan was wrong: note what was different and why.