Tool use & JSON

Function calling: the right tool, the right arguments, valid JSON, or no call at all. 2 prompts. Search and filter these.

Prompt	Difficulty	Lang	What it tests	Source
Parallel tool calls with a distractor function	medium	EN	Choosing the right two of three tools, mapping 'perimeter of a circle' to circumference, passing radius 5 and diameter 10 correctly, and emitting valid JSON only.	Berkeley Function Calling Leaderboard (BFCL)
Don't call the only tool when it doesn't fit	easy	EN	Tool-use restraint: the only available function computes BMI, but the user wants a triangle's area.	Berkeley Function Calling Leaderboard (BFCL)