Universal coding standards, best practices, and patterns for TypeScript, JavaScript, React, and Node.js development.
SkillScore95Maintained
Automatic
◆Coding pack
Last verified 8/21/2026
What it changes
Passed 21 of 22 test cases with the skill, and 20 of 22 without it.
Without skill91%
With skill95%
Checks it passed that the model alone missed
The validation error handler includes a top-level details field alongside the error string.
The conditional rendering uses short-circuit logical AND syntax instead of nested ternary operators.
The API response object uses success set to false and a string value for the top-level error property on failure.
2 fixed19 passed either way0 still failing1 broke
Pass-rate lift
+5 pp
Tokens
+145%
Agent turns
0%
Response time
-19%
Model gemini-3.6-flashMeasured 8/21/2026v721 of 22 cases passed with skill
Tokens, turns and time describe resource use, not a dollar price.
See it in action
One of 2 test cases the skill fixed. Same model, same prompt, with and without the skill.
1 of 2
Prompt
Please design a Next.js REST API route for updating item data based on our standard backend conventions. Your output should include the input validation schema, the route handler code featuring error handling and standard response structures, and a documented JSDoc header for the handler function. Format the output with clear section headers for each of these three deliverables.
What was checked, without and with the skill
Checked
Without skill
With skill
The API response object uses success set to false and a string value for the top-level error property on failure.
Missed
Passed
The validation error handler includes a top-level details field alongside the error string.
Missed
Passed
case-01 · gemini-3.6-flash · 8/21/2026 · answers are capped and redacted
What's inside
The instructions your model reads when the skill loads.