your agent is not a loop
the loop is the smallest part of the system
LOOP vs GRAPH vs HARNESS ENGINEERING
most teams use all three words for the same thing
that is why agent debugging feels impossible
LOOP ENGINEERING
controls repetition
turns retries budgets exits no progress
use durable execution when a run must survive failure
→ https://t.co/rX08Ugw1Yy
GRAPH ENGINEERING
controls topology
nodes edges state branches cycles checkpoints
use a stateful graph when the agent chooses its next step
→ https://t.co/ACgBjw6XK4
use graph algorithms when the topology itself needs analysis
→ https://t.co/0GiC8o7Ei9
HARNESS ENGINEERING
controls reality
tools permissions memory sandboxes evals traces humans
isolate code and tool execution from the host
→ https://t.co/Tuk8b4pcSd
put an eval gate before every model or prompt change
→ https://t.co/dr1GZlC75R
keep one trace across every model node and tool call
→ https://t.co/zsSTLpfY9C
without loop engineering it never stops
without graph engineering you cannot see why
without harness engineering it can touch anything
the prompt is inside the loop
the loop is inside the graph
the graph is inside the harness
the model is the smallest box in the system
save this before your next agent rewrite
then read the article below
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