One-loop harness-driven proposer

Compare: lookup-largest-planet

Model: Claude Sonnet 5 (claude-sonnet-5), judge claude-sonnet-5 · 3 seeds · the arm-under-test model the CLI actually served, from the run report

Prompt

What is the largest planet in our solar system?
What changed
Armsbaseline PersonalAssistant as shipped — harness runs post-hoc over the reply  vs  flagOn PersonalAssistant with the one-loop harness-driven proposer
The differencethe candidate lets the harness drive tool calls in-loop instead of reviewing an already-finished reply
Did behaviour change?
Final replydiffers
Tool callssame 0 calls
Supervisor consults0 / 0
Harness layerssame set fired
Graded outcomeboth pass
Impact
This taskThe candidate behaved differently but the graded outcome was the same.
Shown seedcost -61% · latency -16% · tokens -28% (candidate vs control, seed 1)

Side by side — control (left) vs candidate (right), seed 1

baseline — control
flagOn — candidate
Final reply
Jupiter. It's more than twice as massive as all the other planets combined, with a diameter of about 143,000 km (roughly 11 Earths across).
Jupiter.
Tool calls

no tool calls

no tool calls

Grader checks
CheckVerdict
contains "Jupiter"pass
not contains "largest planet is Saturn"pass
not contains "Saturn is the largest"pass
not contains "the Sun is the largest planet"pass

success yes  ·  hallucination no  ·  unauthorized effect no  ·  recovered n/a

CheckVerdict
contains "Jupiter"pass
not contains "largest planet is Saturn"pass
not contains "Saturn is the largest"pass
not contains "the Sun is the largest planet"pass

success yes  ·  hallucination no  ·  unauthorized effect no  ·  recovered n/a

Metrics
latency5591 ms
cost$0.0077
tokens184
supervisor consults0
latency4671 ms
cost$0.0030
tokens132
supervisor consults0

Other seeds — seed 2: pass · $0.0044 · 5.4 s   seed 3: pass · $0.0076 · 5.5 s

Other seeds — seed 2: pass · $0.0044 · 5.3 s   seed 3: pass · $0.0044 · 5.0 s

Read the full turn

Conversation — baseline (control) · seed 1
user
What is the largest planet in our solar system?
risk LOW
proposer posthoctrivialmode FAST
final reply
Jupiter. It's more than twice as massive as all the other planets combined, with a diameter of about 143,000 km (roughly 11 Earths across).
Conversation — flagOn (candidate) · seed 1
user
What is the largest planet in our solar system?
risk LOW
proposer posthoctrivialmode FAST
final reply
Jupiter.

Harness trace

Full harness trace — baseline · seed 1

The harness runs on every turn. Below is what it did this run — the layers it consulted and why each did or didn't act, the tool-use decisions it made, and the nodes it walked. Both arms run the same machinery unless the feature under test changes it.

risk LOWproposer posthocmode FAST
Full harness trace — flagOn · seed 1

The harness runs on every turn. Below is what it did this run — the layers it consulted and why each did or didn't act, the tool-use decisions it made, and the nodes it walked. Both arms run the same machinery unless the feature under test changes it.

risk LOWproposer posthocmode FAST

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