DataFlow-Harness is another sign that the real agent product is the harness around the model.
The system gives Claude Code more than a natural-language request. It grounds the agent in DataFlow-Skills and an MCP operator registry, then mediates changes as typed mutations against a live platform state. The resulting pipelines become persistent, editable visual DAGs, and validation rejects updates that break graph structure or schema compatibility.
The ablation is the important part: procedural guidance helps most when tasks require implicit domain knowledge, while simple routing tasks do not need it. In other words, MCP metadata alone is not always enough. Agents need environment state, operator contracts, reusable procedures, and validators if their outputs are supposed to remain governable after generation.