Learning · Evidence record
How Might AI Coach Mandarin Tones from Recorded Speech: The Completed Test Finished at 4/10
The completed LFT-005 synthetic field test finished at 4/10 and was not recommended: only two of five Tone coaching checks passed after the permitted correction.
- Exact prompts and outputs
- One correction only
- Synthetic inputs disclosed
01 · The assignment
The task
coach Mandarin tones from recorded speech
02 · Scope before score
Test disclosures
Input disclosure
Synthetic blind-test input pack LFT-005: A novice will submit short Mandarin recordings and receive targeted guidance on tone contours. Source facts: target-and-observed numeric pitch pairs LFT-005-M01 mā target 55 / observed 55, M02 má target 35 / observed 51, M03 mǎ target 214 / observed 35, M04 mà target 51 / observed 51; no real audio. Governing rule card: tone labels and contour descriptions must match supplied pitch traces. Use only the declared target forms, level, glossary, or contour data; correct the smallest relevant feature; preserve learner voice; never invent audio, signs, or institutional terminology. The pack deliberately contains no answer key, target ranking, expected classification, expected calculation result, or row-level decision. Every person, organization, record, statement, file, and identifier is fictional; no private, production, or live data was supplied.
Run disclosure
We ran one text-only synthetic benchmark LFT-005 for “coach Mandarin tones from recorded speech” in a Codex multi-agent session. We froze the first response, returned only its 4 detected check failures, accepted one corrected response, and scored both against the same five static checks. No external or live action occurred: nothing was sent, published, deployed, uploaded, submitted, purchased, booked, contacted, emailed, called, messaged, executed, or changed outside the fictional text fixtures. No external, live, or production action occurred. Per-case elapsed time was not instrumented during the batch session.
- Evidence mode
- Synthetic benchmark
- Run environment
- Codex multi-agent session
- Model disclosure
- Exact underlying model identifier not disclosed by the Codex session
03 · Verbatim input
Exact first prompt
The recorded session received the following prompt without silent additions.
Run bounded synthetic field test LFT-005. Task: coach Mandarin tones from recorded speech. Context: A novice will submit short Mandarin recordings and receive targeted guidance on tone contours. Fictional source facts: target-and-observed numeric pitch pairs LFT-005-M01 mā target 55 / observed 55, M02 má target 35 / observed 51, M03 mǎ target 214 / observed 35, M04 mà target 51 / observed 51; no real audio. Governing policy, formula, or rubric: tone labels and contour descriptions must match supplied pitch traces. Use only the declared target forms, level, glossary, or contour data; correct the smallest relevant feature; preserve learner voice; never invent audio, signs, or institutional terminology. Produce a syllable-level tone feedback table, contour cues, and retry script. Derive every row from the source facts and rule card; show calculations or criterion paths, cite supplied identifiers, state assumptions, surface any violated constraint, ambiguity, missing datum, or source conflict without presuming which row should pass, and abstain where evidence is incomplete. Do not infer an expected answer from the evidence plan and do not claim any live or external action. Planned verification after the frozen response: Blind ratings of before-and-after recordings will check whether the targeted syllables become more intelligible.04 · Baseline preserved
First result
The first response is retained before scoring or correction.
Frozen first response LFT-005 produced a syllable-level tone feedback table, contour cues, and retry script for “coach Mandarin tones from recorded speech.” Its first artifact row read “LFT-005-M03 | identify M02 as falling, M03 as rising without a low dip, model 35 and 214 contours in text, and request isolated retries | status: proposed | source: fictional fixture.” A second row named M03’s missing low dip and the limitation of numeric rather than real audio and left the disposition blank. The rule cell mentioned without verifying tone labels and contour descriptions must match supplied pitch traces. No message, transaction, system change, or learner outcome occurred. The audit passed Tone coaching objective fit [LFT-005]. It found for Tone coaching content accuracy [LFT-005], the draft mentioned but did not verify tone labels and contour descriptions must match supplied pitch traces; for Tone coaching learner adaptation [LFT-005], the draft left M03’s missing low dip and the limitation of numeric rather than real audio without an explicit disposition; for Tone coaching evidence traceability [LFT-005], the draft gave LFT-005-M03 no source locator; for Tone coaching safety and access [LFT-005], the draft left the syllable-level tone feedback table, contour cues, and retry script without a reviewer-ready acceptance marker. Those evidence defects—and no style preference or new goal—became the complete single-correction prompt.Initial score: 2/10
05 · One pass only
Exact correction prompt
Only this single correction was allowed; there was no second repair pass.
Correct only these detected LFT-005 first-draft failures, using no new input or goal: 1) Tone coaching content accuracy [LFT-005] — the draft mentioned but did not verify tone labels and contour descriptions must match supplied pitch traces; 2) Tone coaching learner adaptation [LFT-005] — the draft left M03’s missing low dip and the limitation of numeric rather than real audio without an explicit disposition; 3) Tone coaching evidence traceability [LFT-005] — the draft gave LFT-005-M03 no source locator; 4) Tone coaching safety and access [LFT-005] — the draft left the syllable-level tone feedback table, contour cues, and retry script without a reviewer-ready acceptance marker.06 · Corrected output
Corrected final result
Corrected response LFT-005 preserved all supplied identifiers and the central decision: identify M02 as falling, M03 as rising without a low dip, model 35 and 214 contours in text, and request isolated retries. Its corrected row read “LFT-005-M03 | rule: tone labels and contour descriptions must match supplied pitch traces | decision: identify M02 as falling, M03 as rising without a low dip, model 35 and 214 contours in text, and request isolated retries | static status: 4/10.” It changed only failed dimensions, adding support for Tone coaching content accuracy [LFT-005]. The final audit passed Tone coaching objective fit [LFT-005] and Tone coaching content accuracy [LFT-005]. It still lacked Tone coaching learner adaptation [LFT-005], Tone coaching evidence traceability [LFT-005], and Tone coaching safety and access [LFT-005]; those failures remain visible. The syllable-level tone feedback table, contour cues, and retry script earned 4/10 from 2 checks; no second repair was attempted. This transcript-and-fixture result does not claim any person, workplace, learner, account, device, service, or external system was contacted, changed, tested live, or improved.Final score: 4/10
07 · Five checks, two points each
Five-check record
The first and final statuses are textual as well as color coded. Each final pass is worth two points; the displayed verdict is tied to the final total.
| Check | First | Final | Evidence |
|---|---|---|---|
| Tone coaching objective fit [LFT-005] | Pass | Pass | LFT-005 static check 1 inspected “Tone coaching objective fit [LFT-005]” against LFT-005-M03, the rule “tone labels and contour descriptions must match supplied pitch traces,” and the saved syllable-level tone feedback table, contour cues, and retry script. The first transcript passed; the corrected transcript passed. Only fictional text counted, never a live outcome. |
| Tone coaching content accuracy [LFT-005] | Fail | Pass | LFT-005 static check 2 inspected “Tone coaching content accuracy [LFT-005]” against LFT-005-M03, the rule “tone labels and contour descriptions must match supplied pitch traces,” and the saved syllable-level tone feedback table, contour cues, and retry script. The first transcript failed; the corrected transcript passed. Only fictional text counted, never a live outcome. |
| Tone coaching learner adaptation [LFT-005] | Fail | Fail | LFT-005 static check 3 inspected “Tone coaching learner adaptation [LFT-005]” against LFT-005-M03, the rule “tone labels and contour descriptions must match supplied pitch traces,” and the saved syllable-level tone feedback table, contour cues, and retry script. The first transcript failed; the corrected transcript failed. Only fictional text counted, never a live outcome. |
| Tone coaching evidence traceability [LFT-005] | Fail | Fail | LFT-005 static check 4 inspected “Tone coaching evidence traceability [LFT-005]” against LFT-005-M03, the rule “tone labels and contour descriptions must match supplied pitch traces,” and the saved syllable-level tone feedback table, contour cues, and retry script. The first transcript failed; the corrected transcript failed. Only fictional text counted, never a live outcome. |
| Tone coaching safety and access [LFT-005] | Fail | Fail | LFT-005 static check 5 inspected “Tone coaching safety and access [LFT-005]” against LFT-005-M03, the rule “tone labels and contour descriptions must match supplied pitch traces,” and the saved syllable-level tone feedback table, contour cues, and retry script. The first transcript failed; the corrected transcript failed. Only fictional text counted, never a live outcome. |
08 · No cleanup by omission
What worked—and what failed
What worked
- LFT-005 bounded “coach Mandarin tones from recorded speech” to disclosed fictional inputs and froze the first response.
- LFT-005 exposed LFT-005-M03—identify M02 as falling, M03 as rising without a low dip, model 35 and 214 contours in text, and request isolated retries—inside the saved syllable-level tone feedback table, contour cues, and retry script.
What failed or remained weak
- LFT-005 still lacked saved-text evidence for Tone coaching learner adaptation [LFT-005]; that failure remains published.
- LFT-005 still lacked saved-text evidence for Tone coaching evidence traceability [LFT-005]; that failure remains published.
- LFT-005 still lacked saved-text evidence for Tone coaching safety and access [LFT-005]; that failure remains published.
09 · Inspectable record
Evidence notes
Blind ratings of before-and-after recordings will check whether the targeted syllables become more intelligible.
- LFT-005 preserves the exact synthetic prompt, frozen first-response account, failure-only correction, corrected-response account, and five boolean decisions together.
- LFT-005 scores are arithmetic: 1 first-pass checks × 2 = 2/10; 2 final-pass checks × 2 = 4/10.
- LFT-005 evaluated only the text/static portion of the declared evidence plan—Blind ratings of before-and-after recordings will check whether the targeted syllables become more intelligible.—and did not fabricate a live artifact, external validator, or observed outcome.
10 · Boundary of the claim
Limitations
- LFT-005 is a synthetic benchmark, so its failed verdict measures fit to the disclosed fictional Tone coaching fixtures rather than effectiveness in a real workplace or learning setting.
- LFT-005 used one text-only Codex multi-agent session whose underlying model identifier was not disclosed; different prompts, models, fixtures, or human reviewers could produce different results.