This skill should be used when the user asks to determine what tax filings they need, wants to know if they must file a tax return (確定申告), asks about consumption tax obligations (消費税), or needs help understanding their filing requirements. Trigger phrases include: "確定申告が必要か", "申告の種類", "消費税の届出", "課税事業者かどうか", "何を申告すればいい", "申告要否", "税金の申告", "住民税の申告".
NewMaintained
Automatic
◆Finance & Accounting pack
Last verified 8/21/2026
What it changes
Passed 2 of 9 test cases with the skill, and 4 of 9 without it.
Without skill41%
With skill27%
Checks it passed that the model alone missed
Sets assess step status to completed in progress summary.
Categorizes housing loan deduction into Group A for hearing.
Directs execution of /tax-legal-context for legal disclaimer context.
and 5 more in the full report
6 fixed0 passed either way7 still failing9 broke
Pass-rate lift
-14 pp
Tokens
+139%
Agent turns
0%
Response time
-58%
Model gemini-3.6-flashMeasured 8/21/2026v16 of 22 cases passed with skill · 9 comparable
Tokens, turns and time describe resource use, not a dollar price.
See it in action
One of 6 test cases the skill fixed. Same model, same prompt, with and without the skill.
This skill should be used when the user wants to file their tax return electronically via the 確定申告書等作成コーナー (NTA Tax Return Preparation Corner) using Claude in Chrome, Antigravity Browser Sub-Agent, or Playwright CLI (fallback). It guides the browser-based input of calculated tax data. Trigger phrases include: "e-Tax提出", "電子申告", "e-Taxで申告", "作成コーナーに入力", "確定申告書等作成コーナー", "作成コーナー", "申告書を提出".