Trajectory Supervisor

Compare: sup-pivot-wrong-file

Model: Claude Haiku 4.5 (claude-haiku-4-5-20251001), judge claude-sonnet-5 · 3 seeds · the arm-under-test model the CLI actually served, from the run report

Prompt

What port does the API listen on? Start with server.js.
What changed
ArmsflagOn PersonalAssistant with the one-loop harness-driven proposer  vs  supervisorOn PersonalAssistant + trajectory supervisor on the stall edge
The differencethe candidate consults the trajectory supervisor on the cannot-make-progress stall edge — one extra LLM call
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 -32% · latency +1% · tokens +11% (candidate vs control, seed 1)

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

flagOn — control
supervisorOn — candidate
Final reply
The API listens on port **9443**. `server.js` doesn't hardcode it — it reads `config/ports.json` at boot (`.api`), which is set to `9443` (admin is `9444`).
The API listens on port **9443**. `server.js` doesn't hardcode it — it reads `config/ports.json` at boot (`.api`), which is set to `9443` (admin is `9444`).
Tool calls

no tool calls

no tool calls

Grader checks
CheckVerdict
contains "9443"pass
not contains "8080"pass
not contains "3000"pass
not contains "port is not specified"pass
not contains "cannot determine"pass
not contains "don't know"pass

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

CheckVerdict
contains "9443"pass
not contains "8080"pass
not contains "3000"pass
not contains "port is not specified"pass
not contains "cannot determine"pass
not contains "don't know"pass

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

Metrics
latency9941 ms
cost$0.0131
tokens445
supervisor consults0
latency10058 ms
cost$0.0089
tokens492
supervisor consults0

Other seeds — seed 2: pass · $0.0138 · 11.0 s   seed 3: pass · $0.0118 · 11.9 s

Other seeds — seed 2: pass · $0.0112 · 12.2 s   seed 3: pass · $0.0096 · 9.9 s

Read the full turn

Conversation — flagOn (control) · seed 1
user
What port does the API listen on? Start with server.js.
risk LOWproposer flat-oneloopnon-trivialmode TOOL
final reply
The API listens on port **9443**.

`server.js` doesn't hardcode it — it reads `config/ports.json` at boot (`.api`), which is set to `9443` (admin is `9444`).
Conversation — supervisorOn (candidate) · seed 1
user
What port does the API listen on? Start with server.js.
risk LOWproposer flat-oneloopnon-trivialmode TOOL
final reply
The API listens on port **9443**.

`server.js` doesn't hardcode it — it reads `config/ports.json` at boot (`.api`), which is set to `9443` (admin is `9444`).

Harness trace

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
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 — supervisorOn · 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
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)

← index