Meta titles and descriptions are the only part of your page most searchers ever read. They are also the part most sites leave to whatever their CMS generated in 2019.
What each field does
The title is a ranking factor and the headline of your search listing. It carries the keyword and makes the promise.
The description is not a ranking factor. Search engines rewrite it often. It still matters, because when it survives it is the sentence that decides whether someone clicks you or the result above you.
Writing the description as if it were a ranking lever produces keyword soup. Writing it as ad copy produces clicks.
Practical limits
Both fields get cut off, and where depends on pixel width rather than a fixed character count. Working rules that hold up: keep titles around 55 to 60 characters and descriptions around 150 to 160, and put the important half first so a truncation costs you the least.
If your brand name is in the title, it is spending characters. Worth it on your homepage, rarely worth it on an article.
Judging a generated set
Does the title state the specific thing? "Marketing Tips" is a category. "Meta Description Length in 2026" is a page.
Would the description work as an ad? If it describes the page ("In this article we look at...") it is wasted. If it states what the reader gets, it earns the click.
Do ten pages have ten different titles? Bulk-generated meta has a habit of converging. Read them as a set and vary the ones that rhyme.
The pages worth doing first
Not all of them. Start with the pages that already get impressions and few clicks, which is the clearest signal that the listing is losing an argument it could win.
After that: your commercial pages, then anything you are actively promoting. Pages nobody finds are not a meta problem.
Frequently asked questions
Why does Google show a different description than mine?
Because it often rewrites descriptions to match the query. A good one raises the chance yours is used and gives it something better to work from.
Does changing meta improve rankings?
The title can. The description generally does not, but a higher click-through rate on a listing is worth having on its own terms.
Can I generate meta for pages that are not in my campaign?
Generation works from your campaign's brief, so it reflects your product and voice. For a specific page, creating a campaign from that page's URL gives the sharpest result.