I can’t use the Gemini prototyper, anything I give it this is a consistent reponse I get…
[GoogleGenerativeAI Error]: Error fetching from https://monospace-pa.googleapis.com/v1/models/gemini-2.5-pro:streamGenerateContent?alt=sse: [400 Bad Request] The input token count (1049725) exceeds the maximum number of tokens allowed (1048576).
This error means you’re sending too much text (1,049,725 tokens) to the Gemini 2.5 Pro model, which has a hard limit of 1,048,576 tokens per request. Tokens are chunks of text (words, punctuation, or subwords) that the AI processes. TO FIX IT, shorten your input — remove unnecessary details, split long prompts into smaller parts, or summarize content — so it stays under the token limit.
Even one word prompt shows this error. The prototyper never execute anything.
Have a look at the file(s) you’re working on and their sizes (lines and char count) maybe see/ask if a refactor of the file is in order. I had a js file that was getting pretty big and single line prompts against that file bogged it down and I would get errors and even no responses.
I used straight Gemini outside of FBS and had it refactor my single js file into many smaller, modular files, and link everything back together. I copy pasted into FBS, and used the prompt that Gemini made for me to tell FBS that I had refactored my initial file and their setup.
Smooth sailing for me since then. YMMV