How important is it to clarify URL parameters?

[nicole.healthline]

We have a long list of URL parameters in our Google Webmasters account. Currently, the majority are set to 'let googlebot decide.'

How important is it to specify exactly what googlebot should do? Would you leave these to 'let googlebot decide' or would you specify how googlebot should treat each parameter?

[KeriMorgret]

If you know right away what the parameter does, I'd go ahead and tell Googlebot what the parameter is or how to treat it. It's one more signal to help fight against duplicate content, and I'd take advantage of everything I can give Google to help tell them about how I want them to rank my site.