Implement Plan

Implement the given plan or spec document phase by phase. Write robust, idiomatic code that follows codebase patterns and industry best practices.

When to Use

• An approved plan or spec exists and is ready for implementation
• Executing phases from dev/plans/ or a similar handoff document
• The user says "implement this plan", "execute the spec", or "work through the phases"
• A create-plan artifact needs to be turned into working code

Skills and Guidelines

Before implementing, discover what agent skills are available in the host environment and in the target codebase — for example skills/, .agents/skills/, .cursor/skills/, .claude/skills/, or any injected available-skills list.

Read the SKILL.md for skills that appear relevant to the languages, frameworks, libraries, or patterns required by the plan. Use those skills as guidelines and best practices during implementation. Do not assume a fixed checklist; pick what fits this task and codebase. If the plan includes a Skills for the executor section, start there — then supplement with any other relevant skills you discover.

Process

1. Read the spec — Understand phases, success criteria, and scope boundaries.
2. Explore the codebase — Read files mentioned in the spec and related code.
3. Analyze patterns — Identify existing conventions, architecture, and idioms to follow.
4. Implement phase by phase — Complete one phase before moving to the next. Do not skip ahead.
5. Verify your work — Run codebase gates when available (for example make check or make test) after code changes. Skip for docs-only changes.

Implementation Rules

• Follow the plan — The spec is your contract; implement what is specified.
• Match codebase patterns — Use existing conventions, not new ones.
• Write robust code — Handle errors, edge cases, and failure modes.
• Be idiomatic — Use language best practices and established patterns.
• No shortcuts — Implement fully; do not stub or leave placeholders.
• Minimize scope — Do not add unrelated refactors or features beyond the plan.

Verification

• Code changes: Run make check or make test before proceeding to the next phase.
• On failure: Run make fix first, then re-run make check.
• Documentation-only: Skip verification.

Communication

• If the plan does not match codebase reality, explain the discrepancy.
• If you need to deviate, explain why before making changes.
• Update checkboxes in the spec as you complete each section.

Output

After each phase (or at completion):

• Summarize what was implemented and which files were touched.
• Report verification results (pass/fail, commands run).
• Note any deviations from the plan and why.
• Call out remaining phases or open items if work is incomplete.