Implement

Execute implementation directly from conversation context and task description. This is Arc's true Simple tier executor — no plan, spec, or /arc-start state required.

Key difference from /arc:core:execute: This skill is standalone. It does not require .arc/ state, plans, or beads. It works from conversation context alone.

Source: Conversation context + input + mentioned files.

Instructions

Step 1: Create Task Graph Immediately

ONLY use what's already available:

• The user's input
• Conversation history (already in context)

DO NOT:

• Read files unless the user explicitly asks you to
• Grep or explore the codebase
• Spawn sub-agents or delegate work — do ALL implementation directly yourself

Create tasks immediately from context. Include file paths in task descriptions so they can be read during execution.

For each work item, create a task:

TaskCreate({
  "subject": "Fix auth token validation",
  "description": "Full implementation details from context",
  "activeForm": "Fixing auth token validation"
})

Set dependencies with addBlockedBy to identify which tasks depend on others.

Step 2: Execute Tasks Sequentially

For each task (in dependency order):

1. Claim: TaskUpdate({ taskId: "N", status: "in_progress" })
2. Read files as needed: Use Read tool on file paths from task description
3. Implement: Make changes based on context
4. Verify: Run any task-specific verification
5. Complete: TaskUpdate({ taskId: "N", status: "completed" })
6. Next: Find next unblocked task via TaskList

Step 3: Run Exit Criteria

Before declaring completion:

1. Run the verification (tests, commands, etc.)
2. If pass → "Exit criteria passed"
3. If fail → fix issues and retry

Step 4: Loop Until Done

Continue until:

• All tasks completed AND
• Exit criteria pass

Say "Exit criteria passed" when complete.

Error Handling