What's a "red flag" that instantly tells you a new agency partner (or client) will be a nightmare?

Hey r/AgencyPartners,

Building a new partnership is always a risk. We've all been burned by a partner (or a client) who ended up being a total time-vampire.

We've talked about frustrations, but let's talk about prevention. What are the early warning signs you look for?

I'll start: For me, a major red flag is a complete lack of a single point-of-contact or a clear feedback process.

If I get vague feedback like "I'm not sure I like it" from five different people via email and a Slack DM, I know the project is going to be a disorganized, unprofitable mess.

What's your #1 "red flag" that makes you walk away (or at least charge a lot more)?