Trajectory Supervisor (mid-task stalls)

Compare: sup-mid-transitive-import

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 version does package.json declare?
What changed
ArmssupervisorOff supervisorOff  vs  flagOn PersonalAssistant with the one-loop harness-driven proposer
The differencecontrol supervisorOff vs candidate flagOn
Did behaviour change?
Final replyidentical
Tool callssame 0 calls
Supervisor consults0 → 1
Harness layersdiffer — candidate also: supervisor
Graded outcome0/3 vs 0/3 pass
Impact
This taskThe candidate behaved differently, with no clear gap in outcome. Passed 0 of 3 runs with the candidate vs 0 of 3 with the control.
Shown seedcost +6% · latency +16% · tokens +6% (candidate vs control, seed 1)

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

supervisorOff — control
flagOn — candidate
Final reply
I couldn't complete this — I kept running into a problem (Trace where the exported constant TIMEOUT_MS is finally defined and give me its value.). You may want to retry or rephrase what you need.
I couldn't complete this — I kept running into a problem (Trace where the exported constant TIMEOUT_MS is finally defined and give me its value.). You may want to retry or rephrase what you need.
Tool calls

no tool calls

no tool calls

Grader checks
CheckVerdict
contains "4300"fail

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

CheckVerdict
contains "4300"fail

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

Metrics
latency15906 ms
cost$0.0114
tokens764
supervisor consults0
latency18523 ms
cost$0.0121
tokens810
supervisor consults1

Other seeds — seed 2: fail · $0.0101 · 15.0 s   seed 3: fail · $0.0101 · 14.8 s

Other seeds — seed 2: fail · $0.0118 · 17.8 s   seed 3: fail · $0.0133 · 19.7 s

Read the full turn

Conversation — supervisorOff (control) · seed 1
user
What version does package.json declare?
risk LOW
model
`package.json` declares version **4.12.0**. The package name is `svc`.
turn 2
proposer posthoctrivialmode FAST
user
Which module does index.js import first?
risk LOW
model
`index.js` imports `./lib/reexport` first. It's also the only import, and it pulls in `TIMEOUT_MS` from that module.
turn 3
proposer posthoctrivialmode FAST
user
Trace where the exported constant TIMEOUT_MS is finally defined and give me its value.
risk LOWproposer flat-oneloopnon-trivialmode TOOL
final reply
I couldn't complete this — I kept running into a problem (Trace where the exported constant TIMEOUT_MS is finally defined and give me its value.). You may want to retry or rephrase what you need.
Conversation — flagOn (candidate) · seed 1
user
What version does package.json declare?
risk LOW
model
`package.json` declares version **4.12.0**. The package name is `svc`.
turn 2
proposer posthoctrivialmode FAST
user
Which module does index.js import first?
risk LOW
model
`index.js` imports `./lib/reexport` first. It's also the only import, and it pulls in `TIMEOUT_MS` from that module.
turn 3
proposer posthoctrivialmode FAST
user
Trace where the exported constant TIMEOUT_MS is finally defined and give me its value.
risk LOWproposer flat-oneloopnon-trivialmode TOOL
harness directive
{"action":"REDIRECT_STRATEGY","rationale":"The run has hit a recurring persistent tool failure 3 times while using DIRECT_EDIT, which is the wrong approach for a read-only tracing task (find where TIMEOUT_MS is finally defined and its value). Switching to a search-based approach that follows re-exports/imports to the final definition should avoid the failing tool path.","strategy_hint":"BROADER_SEARCH","plan_note":null,"investigation":null,"question":null}
final reply
I couldn't complete this — I kept running into a problem (Trace where the exported constant TIMEOUT_MS is finally defined and give me its value.). You may want to retry or rephrase what you need.

Harness trace

Full harness trace — supervisorOff · 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
hypothesis—single clear LOW-risk task — no competing explanation worth surfacing
hypothesisactedConsidered 5 ways this request could be understood; going with the most direct one
contradiction— ×2fewer than 2 beliefs — nothing to compare
diagnosticsactedHealth: nominal
diagnosticsacteda sub-dimension crossed the caution threshold
control_state—NORMAL
control_stateactedPausing — blocked
planning—one eligible task — serial execution
executionactedmodule_type=business_logic
verificationactedverification failed: Result is null — syntax check failed
recoveryactedTrying a different approach — switched to "TRACE_EXEC" (LOCAL replan)
recoveryactedturn stalled with no answer — returning an explicit could-not-complete reply
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) → rollback_replan (1) → output_validation (2)

Other trace events

{
  "kind": "turn_boundary",
  "turn": 2,
  "prompt": "Which module does index.js import first?"
}
{
  "kind": "turn_boundary",
  "turn": 3,
  "prompt": "Trace where the exported constant TIMEOUT_MS is finally defined and give me its value."
}
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
hypothesis—single clear LOW-risk task — no competing explanation worth surfacing
hypothesisacted ×2Considered 5 ways this request could be understood; going with the most direct one
contradiction— ×3fewer than 2 beliefs — nothing to compare
diagnosticsacted ×2Health: nominal
diagnosticsacteda sub-dimension crossed the caution threshold
control_state— ×2NORMAL
control_stateactedPausing — blocked
planning— ×2one eligible task — serial execution
executionacted ×2module_type=business_logic
verificationacted ×2verification failed: Result is null — syntax check failed
recoveryactedTrying a different approach — switched to "BROADER_SEARCH" (LOCAL replan)
recoveryactedTrying a different approach — switched to "REIMPLEMENT" (LOCAL replan)
recoveryactedturn stalled with no answer — returning an explicit could-not-complete reply
reviewer_passactedSuccess criterion not covered by any belief: "Respond helpfully, accurately, and safely to the user request."
supervisoractedREDIRECT_STRATEGY: The run has hit a recurring persistent tool failure 3 times while using DIRECT_EDIT, which is the wrong approach for a read-only tracing task (find where TIMEOUT_MS is finally defin

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) → rollback_replan (1) → action_gate (2) → rollback_replan (2) → output_validation (3)

Other trace events

{
  "kind": "turn_boundary",
  "turn": 2,
  "prompt": "Which module does index.js import first?"
}
{
  "kind": "turn_boundary",
  "turn": 3,
  "prompt": "Trace where the exported constant TIMEOUT_MS is finally defined and give me its value."
}

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