For now the hub asks YouTube for view access only, so it cannot upload,
edit or delete anything yet. Support for that is planned, and this page will
say so when it arrives.
Add the account
1
Open Accounts and press Add account
In the admin screen, open Accounts and press Add account at the top
right.

2
Choose YouTube and press Add account
Under Signs in with, press the circle next to YouTube. The account
name fills in as 
youtube, and OAuth client already has the one your
Google accounts use. Leave both as they are in most cases.Press Add account at the bottom.
3
Press Connect now
When the screen says the account was added, press Connect now. Google’s
sign-in page opens.

4
Choose your Google account
Choose the Google account that owns your YouTube channel.

5
Choose the account that has the channel
If your Google account has a brand account under it, Google asks once more
which one to continue as. Choose the one that holds the YouTube channel you
want analysed. If the channel lives on a brand account, choose the brand
account, or your channel’s analytics will look at the wrong one. If this
screen does not appear, skip it.

6
Continue past the unverified-app warning
Google warns that it has not verified this app. The app is the OAuth client
you made yourself, so this is expected. Press Advanced, then the link at
the bottom that starts with Go to.

7
Press Continue
On the screen saying you are signing back in, press Continue.

8
Check the access and press Continue
This screen shows what the hub will be allowed to do. Press Continue
and you are back in the hub.

9
Check that it says connected
You are done when the 
youtube account shows as connected on the
Accounts screen.
10
Refresh Claude's tool list
Claude keeps its own copy of the tool list and does not notice a new
account by itself. Refresh Claude’s tool list, then
ask in a new conversation.
Reading comments as well
To read comments through a sign-in, YouTube demands permission to edit and delete your videos and comments too. The hub does not take that permission. It reads comments with an API key for public data instead. Without a key, everything but comments works. To add comments, create an API key in the Google Cloud console, restrict it to the YouTube Data API v3, then open theyoutube account in the admin screen and
paste it under YouTube API key (optional).