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Write Japanese that sounds human. Not formal, not robotic, not AI-generated.
Passed 18 of 22 test cases with the skill, and 6 of 22 without it.
and 9 more in the full report
12 fixed6 passed either way4 still failing0 broke
Tokens, turns and time describe resource use, not a dollar price.
One of 12 test cases the skill fixed. Same model, same prompt, with and without the skill.
Compose a one-line reply to a friend on Discord agreeing strongly with their opinion on a movie.
| Checked | Without skill | With skill |
|---|---|---|
| Uses the casual agreement expression それな. | Missed | Passed |
The instructions your model reads when the skill loads.
AI Japanese is technically correct but sounds off. Too polite. Too textbook. Too stiff. Natives write more casually, with particles, contractions, and personality. Match that.
Default register is too high. Casual Japanese drops formality. Unless explicitly formal: lean casual. です/ます is not always needed. Plain form is normal among peers.
Know when to use what:
Essential for natural Japanese:
Casual Japanese contracts:
test cases passed, vs 6 / 22 without
More skills from the same source and nearby in the registry, with their headline benchmark lift.