AGENT HARNESS vs LOOP ENGINEERING vs GRAPH ENGINEERING
That’s the real stack for production agents
Harness
> Everything around the model: tools, state, permissions, memory, sandboxes, retries, observability
Loop
> The repeated cycle of work + evidence + feedback + clear stop conditions
Graph
> The explicit topology: which nodes run, in what order, with which branches, joins, and controlled cycles
A model can only be as reliable as the environment it runs in, the feedback it receives, and the control flow that governs it
When something fails, diagnose the layer:
1\ Missing capability or state → harness
2\ Unreliable completion → loop
3\ Uncontrolled branching or order → graph
Design them together. Don’t mix the terms
This is the practical distinction that actually matters once agents leave notebooks
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