Access to the accounts. Analytics, ads, the CMS, the inbox that receives leads. I work in your properties so that you still own them if I leave. Shared screenshots and exported CSVs are a poor substitute and they slow the first fortnight to a crawl.
One decision-maker. A committee of five will stall a landing page for six weeks. I can present to a board. I cannot wait for five people to find a slot every time a headline needs changing. Nominate one person who can say yes, and give that person cover.
Thirty minutes a fortnight in the build, then one monthly call in the hold. I come prepared. I need you to come able to answer a question about the floor, the pipeline, or the offer. If you disappear for six weeks, the work pauses. I will not guess my way through your pricing.
Permission to say no. If a campaign is vanity, if a new channel is a distraction, if a request would spend money you do not have the tracking to judge, I will say no and I will write down why. That is part of what you are hiring. If you want a pair of hands that never pushes back, I am the wrong practitioner.