workflows-work-fb6903— agent skill

Execute the implementation plan: $ARGUMENTS

Purpose

You are executing Stage 4 (Implementation) of the development workflow. A plan exists from Stage 3 with decomposed tasks. Your job is to dispatch sub-agents for each task, collect their structured summaries, and persist everything to disk.

Pre-Conditions

Before starting, verify:

1. .workflow/state.json exists and currentStage is "implementation"
2. Plan file exists (check stages.planning.artifacts.plan in state, usually .workflow/plan.md)

If pre-conditions are not met, report what's missing and halt.

Process

Step 1: Read the Plan

Read .workflow/plan.md and the spec/ADR it references. Build the task execution order from the dependency graph.

Step 2: Dispatch Sub-Agents

For each task in dependency order:

1. Dispatch a sub-agent (use the Agent tool with subagent_type: "general-purpose") with:

• The task definition from the plan (files, acceptance criteria, notes)
• The relevant spec sections
• The ADR hypotheses this task should support/test
• Instructions to return the structured summary format (see below)

1. Parallelize independent tasks: If tasks have no dependency between them, dispatch their sub-agents concurrently using parallel Agent tool calls.

1. Persist the summary immediately upon receipt:

   .workflow/summaries/<branch-slug>-<task-id>.md

1. Verify acceptance criteria: Check each criterion from the plan against the sub-agent's summary. If any fail, note them for review.

Sub-Agent Summary Format

Each sub-agent MUST return this format:

## Sub-Agent Work Summary

### Task

- Branch: <current branch>
- Spec: <spec path>

### Changes
- Files modified: [list]
- Files created: [list]
- Lines: +N / -N

### Claims
1. "[specific testable claim]"
   - Verifiable by: [test or command]

### Spec/Evidence Alignment
- H1 "<text>": SUPPORTS / REFUTES / NO EVIDENCE -- [evidence]

### Tests
- Tests written: N
- Tests passing: N/N
- Commands: `[exact command]`

### Known Gaps
- [anything deferred or uncertain]

### Risks
- [anything that could break other parts]

Step 3: Run Tests

After all sub-agents complete, run the full test suite:

npm test

If tests fail, note which tasks' changes caused the failure.

Step 4: Verify Completeness

Check off each task from the plan:

• All acceptance criteria met?
• All summaries persisted to disk?

• Tests passing?

Step 5: Record and Handoff

1. Update workflow state (.workflow/state.json):

• Set stages.implementation.status to "completed"
• Set stages.implementation.completedAt to current ISO timestamp
• Set stages.implementation.artifacts.summaries to list of summary file paths

• Set currentStage to "review"
• Update updatedAt

1. Present the handoff:

   IMPLEMENTATION COMPLETE
   ========================

   Tasks completed: N/N
   Summaries: [list of paths]
   Tests: N passing, N failing

   Next: Stage 5 - Review (/workflows-review)

Operational Rules

1. 1 sub-agent = 1 commit: Each sub-agent works on exactly one task. Commits happen AFTER review (Stage 5), not during implementation.
2. Summaries to disk immediately: If the orchestrator crashes, summaries on disk survive. This is your recovery mechanism.
3. Do NOT commit during implementation: Code changes remain uncommitted until review validates them.
4. Do NOT implement tasks yourself: Always dispatch sub-agents. Protect your context window.

Anti-Patterns

• Do NOT start implementing without reading the plan first
• Do NOT skip persisting summaries — this is the crash recovery mechanism
• Do NOT commit code during implementation — commits come after review
• Do NOT dispatch a sub-agent without its task definition and spec context
• Do NOT ignore test failures — note them for review even if individual tasks pass