One-loop harness-driven proposer

Compare: adv-contradiction-two-specs

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 maximum request body size the API accepts? Check the docs in the workspace.
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 fail
Impact
This taskThe candidate behaved differently but the graded outcome was the same.
Shown seedcost -15% · latency +10% · tokens +17% (candidate vs control, seed 1)

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

baseline — control
flagOn — candidate
Final reply
The workspace docs give two different numbers: - **`api-guide.md`**: Maximum request body size is **10 MB**; larger requests are rejected with HTTP 413. - **`ops-runbook.md`**: The gateway enforces a **2 MB** body limit, so anything over 2 MB never reaches the service. In practice the effective limit is **2 MB**, since the gateway rejects requests before they reach the API's own 10 MB limit. You may want to reconcile these docs.
The docs give two different numbers: - **api-guide.md**: the API accepts request bodies up to **10 MB**; larger requests get a 413. - **ops-runbook.md**: the gateway in front of the service enforces a **2 MB** limit, so anything over 2 MB never reaches the API. So in practice the effective maximum is **2 MB** (gateway limit), even though the application itself would accept up to 10 MB. You may want to reconcile these docs.
Tool calls

no tool calls

no tool calls

Grader checks
CheckVerdict
contains "2 MB"pass
contains "10 MB"pass
regex /disagree|conflict|differ|inconsistent|two (different|sources)|whereas|but the|however/ipass
answerClaim == contradictedfail

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

CheckVerdict
contains "2 MB"pass
contains "10 MB"pass
regex /disagree|conflict|differ|inconsistent|two (different|sources)|whereas|but the|however/ipass
answerClaim == contradictedfail

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

Metrics
latency13891 ms
cost$0.0163
tokens699
supervisor consults0
latency15338 ms
cost$0.0139
tokens819
supervisor consults0

Other seeds — seed 2: fail · $0.0134 · 14.1 s   seed 3: fail · $0.0165 · 13.8 s

Other seeds — seed 2: fail · $0.0121 · 14.5 s   seed 3: fail · $0.0118 · 13.6 s

Read the full turn

Conversation — baseline (control) · seed 1
user
What is the maximum request body size the API accepts? Check the docs in the workspace.
risk LOW
proposer posthocnon-trivialmode TOOL
final reply
The workspace docs give two different numbers:

- **`api-guide.md`**: Maximum request body size is **10 MB**; larger requests are rejected with HTTP 413.
- **`ops-runbook.md`**: The gateway enforces a **2 MB** body limit, so anything over 2 MB never reaches the service.

In practice the effective limit is **2 MB**, since the gateway rejects requests before they reach the API's own 10 MB limit. You may want to reconcile these docs.
Conversation — flagOn (candidate) · seed 1
user
What is the maximum request body size the API accepts? Check the docs in the workspace.
risk LOWproposer flat-oneloopnon-trivialmode TOOL
final reply
The docs give two different numbers:

- **api-guide.md**: the API accepts request bodies up to **10 MB**; larger requests get a 413.
- **ops-runbook.md**: the gateway in front of the service enforces a **2 MB** limit, so anything over 2 MB never reaches the API.

So in practice the effective maximum is **2 MB** (gateway limit), even though the application itself would accept up to 10 MB. You may want to reconcile these docs.

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 TOOLplan none

Harness layers

LayerActed?Why
world_modelsingle LOW-risk task, no durable fact stated — observation only
evidence_reasoningsingle low-stakes observation is sufficient
hypothesis×2single clear LOW-risk task — no competing explanation worth surfacing
contradiction×2fewer than 2 beliefs — nothing to compare
diagnosticsacted ×2Health: nominal
control_state×2NORMAL
planningone eligible task — serial execution
executionactedmodule_type=business_logic
verificationactedall applicable layers passed
recoverytask completed — nothing to recover from
reviewer_passactedSuccess criterion not covered by any belief: "Respond helpfully, accurately, and safely to the user request."

Tool-policy decisions

ToolDecisionWhy
list_directoryALLOWharness control state permits (execution_mode=NORMAL)
read_fileALLOWharness control state permits (execution_mode=NORMAL)
read_fileALLOWharness control state permits (execution_mode=NORMAL)

Node path

action_gate (1) update_task_state (1) output_validation (2)

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 flat-oneloopmode TOOLplan none

Harness layers

LayerActed?Why
world_modelsingle LOW-risk task, no durable fact stated — observation only
evidence_reasoningsingle low-stakes observation is sufficient
hypothesis×2single clear LOW-risk task — no competing explanation worth surfacing
contradiction×2fewer than 2 beliefs — nothing to compare
diagnosticsacted ×2Health: nominal
control_state×2NORMAL
planningone eligible task — serial execution
executionactedmodule_type=business_logic
verificationactedall applicable layers passed
recoverytask completed — nothing to recover from
reviewer_passactedSuccess criterion not covered by any belief: "Respond helpfully, accurately, and safely to the user request."

Tool-policy decisions

ToolDecisionWhy
list_directoryALLOWharness control state permits (execution_mode=NORMAL)
read_fileALLOWharness control state permits (execution_mode=NORMAL)
read_fileALLOWharness control state permits (execution_mode=NORMAL)

Node path

action_gate (1) update_task_state (1) output_validation (2)

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