Prompt Builder

Compose structured messages arrays for agent API calls — system, few-shot, user, output format.

System prompt Role + rules
Few-shot examples
User message
Output format Optional schema / instructions
Token budget
Approx tokens
0
Messages
0
Budget status
OK
0 / 8,192 tokens (approx) Reserve ~20% for output

Heuristic only (~4 chars/token). Use provider tokenizers for production.

Assembled output