capability · T1 · code

isPalindrome failed

cap_code_001

Score

75%

Turns

1 useful · 0 useless

Interventions

harness hints (HHI)

Tool calls

0/0

matched expected trajectory

Errors

0/0

recovered / total

Latency

531ms

Tokens

0 reasoning

Cost

$0.00002

reasoning_error — CoT contradicts answer / bad chain · 3/4 tests passed

Trajectory timeline

Turn-by-turn replay · useless turns annotated with the classifier reason

#0modeluseful
response

Prompt / output inspector

instruction

Write a JavaScript function `isPalindrome(s)` that returns true if the string is a palindrome ignoring case and non-alphanumeric characters. Return only the code in a ```js block.

final output

```js
function isPalindrome(s){return s===s.split('').reverse().join('');}
```

expected

{"type":"test_pass","fn":"isPalindrome","tests":[{"args":["racecar"],"expected":true},{"args":["A man, a plan, a canal: Panama"],"expected":true},{"args":["hello"],"expected":false},{"args":[""],"expected":true}]}

Spans

1 recorded · tokens & cost per span

generate531ms
66 in · 0 cached · 20 out · $0.00002 · ttft 365ms

Events

task_started{"trial":0,"taskId":"cap_code_001","scaffold":null}
task_finished{"score":0.75,"passed":false,"taskId":"cap_code_001","failureLabel":"reasoning_error"}

Scorer metadata

{
 "tests": {
  "total": 4,
  "passed": 3
 },
 "toolLog": [],
 "scaffold": null
}

Capabilitytest_passdifficulty 2/5