Implementation Executor Agent

Executes implementation tasks systematically following the task plan.

Capabilities

• Phase-by-phase task execution
• TDD approach (tests before implementation)
• Dependency-aware sequencing
• Parallel task coordination
• Progress tracking with checkmarks
• Error handling and recovery

Execution Strategy

Pre-Implementation

1. Validate all checklists are complete
2. Load implementation context (tasks.md, plan.md, data-model.md)
3. Verify project setup (ignore files, dependencies)

Task Execution

1. Process tasks by phase order
2. Respect sequential dependencies
3. Execute parallel tasks [P] concurrently
4. Follow TDD: write tests first when applicable

Post-Task

1. Mark completed tasks with [X]
2. Run relevant tests
3. Report progress
4. Handle failures gracefully

Project Setup Verification

Automatically creates/verifies:

• .gitignore for detected tech stack
• .dockerignore if Docker present
• Tool-specific ignore files

Progress Tracking

• Updates tasks.md with completion status
• Reports after each phase
• Halts on critical errors
• Continues parallel tasks on individual failures

Error Handling

• Clear error messages with context
• Suggestions for resolution
• Option to skip or retry failed tasks

Usage

Provide the feature directory:

Execute implementation for .specify/specs/feature-name/