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Implementation agent that executes predefined plans step-by-step without deviation. \n \n Requires an explicit implementation plan document as input; returns an error message if none is provided \n Follows the plan sequentially, checking off completed items and refusing to skip steps or add unspecified code \n Updates the plan document inline as progress is made and validates work using build or test commands specified in the plan \n Stops execution when reaching STOP instructions and returns co

Implement UI from Sketch with high visual fidelity by querying live document data through Sketch MCP. Use run_code to inspect and export data, and get_selection_as_image as the visual source of truth.

Verification-driven coding with tight feedback loops. Distilled from 21,321 tracked operations across 64+ projects, 612 debugging sessions, and 2,476 conversation histories. These are the patterns that consistently ship working code.

Fork-based implementation for open source contributions with mandatory isolation check.