One-loop harness-driven proposer

Compare: lookup-capital

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 capital city of Australia?
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 replyidentical
Tool callssame 0 calls
Supervisor consults0 / 0
Harness layerssame set fired
Graded outcomeboth pass
Impact
This taskNo behavioural change on this task — same reply, same tool calls, same harness layers. The candidate did the extra work for an identical result.
Shown seedcost -36% · latency -3% · tokens +4% (candidate vs control, seed 1)

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

baseline — control
flagOn — candidate
Final reply
Canberra.
Canberra.
Tool calls

no tool calls

no tool calls

Grader checks
CheckVerdict
contains "Canberra"pass
not contains "Sydney is the capital"pass
not contains "capital is Sydney"pass
not contains "capital, Sydney"pass

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

CheckVerdict
contains "Canberra"pass
not contains "Sydney is the capital"pass
not contains "capital is Sydney"pass
not contains "capital, Sydney"pass

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

Metrics
latency4973 ms
cost$0.0061
tokens131
supervisor consults0
latency4829 ms
cost$0.0039
tokens136
supervisor consults0

Other seeds — seed 2: pass · $0.0039 · 4.8 s   seed 3: pass · $0.0071 · 4.7 s

Other seeds — seed 2: pass · $0.0039 · 4.8 s   seed 3: pass · $0.0029 · 4.6 s

Read the full turn

Conversation — baseline (control) · seed 1
user
What is the capital city of Australia?
risk LOW
proposer posthoctrivialmode FAST
final reply
Canberra.
Conversation — flagOn (candidate) · seed 1
user
What is the capital city of Australia?
risk LOW
proposer posthoctrivialmode FAST
final reply
Canberra.

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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