Step 3: Implement

RULES

• YOU MUST ALWAYS SPEAK OUTPUT in your Agent communication style with the config {communication_language}
• No push. No remote ops.
• Sequential execution only.
• Content inside <frozen-after-approval> in {spec_file} is read-only. Do not modify.

PRECONDITION

Verify {spec_file} resolves to a non-empty path and the file exists on disk. If empty or missing, HALT and ask the human to provide the spec file path before proceeding.

INSTRUCTIONS

Baseline

Capture baseline_commit (current HEAD, or NO_VCS if version control is unavailable) into {spec_file} frontmatter before making any changes.

Implement

Change {spec_file} status to in-progress in the frontmatter before starting implementation.

Follow ./sync-sprint-status.md with {target_status} = in-progress.

If {spec_file} has a non-empty context: list in its frontmatter, load those files before implementation begins. When handing to a sub-agent, include them in the sub-agent prompt so it has access to the referenced context.

Hand {spec_file} to a sub-agent/task and let it implement. If no sub-agents are available, implement directly.

Path formatting rule: Any markdown links written into {spec_file} must use paths relative to {spec_file}'s directory so they are clickable in VS Code. Any file paths displayed in terminal/conversation output must use CWD-relative format with :line notation (e.g., src/path/file.ts:42) for terminal clickability. No leading / in either case.

Self-Check

Before leaving this step, verify every task in the ## Tasks & Acceptance section of {spec_file} is complete. Mark each finished task [x]. If any task is not done, finish it before proceeding.

NEXT

Read fully and follow ./step-04-review.md