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".
SkillScore74Maintained
Automatic
◆Finance & Accounting pack
Last verified 8/22/2026
What it changes
Passed 17 of 23 test cases with the skill, and 5 of 23 without it.
Without skill22%
With skill74%
Checks it passed that the model alone missed
Specifies starting the browser in headed mode with chrome.
Identifies the URL path prefix /syouhi/at for the 2割特例 route.
Records the reception number (受付番号) from the confirmation screen.
and 16 more in the full report
15 fixed2 passed either way3 still failing3 broke
Pass-rate lift
+52 pp
Tokens
+701%
Agent turns
0%
Response time
-60%
Model gemini-3.6-flashMeasured 8/22/2026v117 of 23 cases passed with skill
Tokens, turns and time describe resource use, not a dollar price.
See it in action
One of 15 test cases the skill fixed. Same model, same prompt, with and without the skill.