2 min lesson
Composing SLOs across the harness
Put yourself in this case: "Four harness stages each run at 99% reliability. Why can the end-to-end agent-run reliability still feel unacceptable and what does that imply for SLO design?" Give the clearest next step.
Step 1 of 3
Composing SLOs across the harnessthe chain is only as reliable as its weakest stage
An agent run is a pipeline: retrieval, then model, then tool-call, then apply. End-to-end reliability is the product of the stage reliabilities, not the average - and the gap between that product and the average is where users feel the product fail.
Interactive diagram. Tab through its regions; each focused region shows its detail in the panel below.
diagram: stack
End-to-end success rests on every stage below it - multiply, never average.