Code Forge — Impl

Execute pending implementation tasks for a feature, following the plan generated by /code-forge:plan.

When to Use

• Have a generated plan (state.json + tasks/ directory) ready for execution
• Need to resume a partially completed feature
• Need task-by-task execution with TDD and progress tracking

Workflow

Locate Feature → Confirm Execution → Task Loop (sub-agents) → Verify → Complete

Context Management

Step 11 dispatches a dedicated sub-agent for each task, so code changes from one task don't pollute the context of the next. The main context only handles coordination: reading state, dispatching sub-agents, and updating status.

Detailed Steps

@../shared/configuration.md

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Step 1: Locate Feature

1.1 With Feature Name Argument

If the user provided a feature name (e.g., /code-forge:impl user-auth):

1. Look for {output_dir}/{feature_name}/state.json
2. If not found, search {output_dir}/*/state.json for a feature whose feature field matches
3. If still not found, show error: "Feature '{feature_name}' not found. Run /code-forge:status to see available features."

1.2 Without Argument

If no feature name is provided:

1. Scan {output_dir}/*/state.json for all features
2. Filter to features with status = "pending" or "in_progress" (exclude "completed")
3. If none found: "No features ready for execution. Run /code-forge:plan to create one."
4. If one found: use it automatically
5. If multiple found: display table and use AskUserQuestion to let user select

1.3 Validate Feature State

After locating the feature:

1. Read state.json
2. Check that tasks array is non-empty
3. Check that task files in tasks/ directory exist
4. Show feature progress summary: completed/in_progress/pending counts
5. If all tasks are "completed": "All tasks already completed. Run /code-forge:review {feature} to review."

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Step 10: Ask for Execution Method

Use AskUserQuestion:

• "Start Execution Now (Recommended)" — execute tasks one by one, auto-track progress → enter Step 11
• "Manual Execution Later" — save plan, show resume instructions (/code-forge:impl {feature})
• "Team Collaboration Mode" — show guidelines: commit plan to Git, claim tasks via assignee, sync state.json
• "Generate Plan Only" — only generate plan files, stop here

Step 11: Task Execution Loop (via Sub-agents)

Each task is executed by a dedicated sub-agent to prevent cross-task context accumulation. The main context only handles coordination: reading state, dispatching sub-agents, and updating status.

11.1 Coordination Loop (Main Context)

1. Read state.json
2. Find the next task in execution_order that is "pending" with no unmet dependencies
3. If no such task exists: display "All tasks completed!" and exit loop
4. Display: "Starting task: {id} - {title}"
5. Update task status to "in_progress" in state.json
6. Dispatch sub-agent for this task (see 11.2)
7. Review the sub-agent's execution summary
8. Ask user via AskUserQuestion: "Is the task completed?"
   • "Completed, continue to next" → update status to "completed", continue loop
   • "Encountered issue, pause" → keep "in_progress", exit loop
   • "Skip this task" → update status to "skipped", continue loop
9. Repeat from step 1

11.2 Task Execution Sub-agent

Spawn a Task tool call with:

• subagent_type: "general-purpose"
• description: "Execute task: {task_id}"

Sub-agent prompt must include:

• The task file path: {output_dir}/{feature_name}/tasks/{task_id}.md (sub-agent reads it)
• The project root path
• Tech stack and testing strategy (from state.json metadata or plan.md)
• Instruction to follow TDD: write tests → run tests → implement → verify
• Coding standards (mandatory): include the following standards in the sub-agent prompt so it writes quality code from the start:

@../shared/coding-standards.md

• Instruction to return ONLY a concise execution summary

Sub-agent executes:

1. Read the task file from disk
2. Follow the task steps (TDD: write tests → run tests → implement → verify)
3. Commit changes if all tests pass (with descriptive commit message)

Sub-agent must return a concise execution summary:

STATUS: completed | partial | blocked
FILES_CHANGED:
- path/to/file.ext (created | modified)
- ...
TEST_RESULTS: X passed, Y failed
SUMMARY: <1-2 sentence description of what was done>
ISSUES: <any blockers or concerns, or "none">

Main context retains: Only the execution summary (~0.5-1KB per task). All code changes, test outputs, and file reads stay in the sub-agent's context and are discarded.

11.3 Parallel Execution (Optional)

When multiple pending tasks have no mutual dependencies (none depends on another), they may be dispatched as parallel sub-agents using multiple Task tool calls in a single message. Each sub-agent works in isolation on its own task.

Use parallel execution only when:

• Tasks modify different files (no overlap in "Files Involved")
• Tasks have no dependency relationship (neither depends on the other)
• User has agreed to parallel execution

After all parallel sub-agents complete, review each summary and update state.json for all completed tasks before continuing the loop.

Step 11.5: Verify Generated Files

Before completion summary, verify all generated files:

Checks:

1. Required files exist and are non-empty: overview.md, plan.md, state.json
2. tasks/ directory exists and contains .md files with descriptive names
3. state.json is valid JSON with required fields (feature, status, tasks, execution_order); task count matches task files; all IDs in execution_order match tasks entries
4. plan.md contains: title heading, ## Goal, ## Task Breakdown, ## Acceptance Criteria
5. overview.md contains ## Task Execution Order table

On pass: Show checklist with all items passing, continue.

On error (missing required files): Show what's missing. Attempt auto-fix:

• Empty overview.md → generate template from plan data
• Missing tasks/ → create directory
• Missing state.json → generate initial state from task files found Then re-verify.

On warnings (count mismatch, missing optional section): Show warnings, continue by default.

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Step 12: Completion Summary

After all tasks are completed:

1. Update state.json with final status
2. Regenerate the project-level overview ({output_dir}/overview.md)

Feature implementation completed!

Completed tasks: {completed}/{total}
Location: {output_dir}/{feature_name}/
Total time: {actual_time}

Next steps:
  /code-forge:review {feature_name}   Review code quality
  /code-forge:status {feature_name}   View final status