Recruiter activities that increase workload and add no value include

Cold calling and explaining why you’re different. You’re not. I’ve heard the same pitch from 2 dozen other recruiters.
Not looking at our website/business and expecting us to explain what we do
Not reading the job descriptions
Sending contractors for permanent roles and visa versa
Sending candidates with completely different tech skills than the role calls for (e.g. .net candidates for ruby roles)