Long queries cause an uncaught Tavily bug

[ldorigo]

Describe the bug
I tried running a deep research with a lot of context describing exactly what I want to search for and how to format it as well as some background information (similar to the kind of input I would give to deep research on chatgpt); but I get multiple errors from tavily saying "Error: 400 Client Error: Bad Request for url: https://api.tavily.com/search. Failed fetching sources. Resulting in empty response.". I printed the full message of the exception and it's because "'{"detail":{"error":"Query is too long. Max query length is 400 characters."}}'".

To Reproduce
Steps to reproduce the behavior:

1. Set search engine to tavily
2. Run deep research (probably also other kinds of research) with a long prompt (seemingly >400 characters).
3. Observe

Expected behavior
I suppose in case of long queries; first there should be a "planning step" or "query rewriting" step; and only after it should proceed to do the actual search?

[ElishaKay]

Interesting

Thanks for the heads up @ldorigo

Green light for the PR for whoever finds the root cause