how long can the prompt_template be? for creating agents

[itserror404]

Hi, how long can the prompt_template be? and does this get sent to the LLM every time i.e. does it impact the no of tokens used? thanks!

[aniruddhaadak80]

Long prompt templates do matter because they are sent repeatedly, so the cost impact compounds across every invocation rather than appearing once. Even when the model can technically accept the size, the better question is whether the template is carrying instruction value or just becoming persistent overhead.

A practical way to think about it is to keep the stable rules concise and move variable guidance into data or runtime context only when needed. That usually gives a better balance between control, token efficiency, and easier iteration over the prompt itself.