Ask a media buyer to connect an account to an outside tool and the objection arrives before the sentence ends: what access does it want, and what can it do with it. It is the right objection. Most integrations answer it with an OAuth screen and a list of permissions you accept in a hurry.
There is another way to move data out of a Google Ads account, and it is a first-party feature of Google Ads itself.
What a script actually is
Under Tools and settings there is a section called Scripts. It takes JavaScript, and it runs that code inside the account, on Google's own infrastructure, on a schedule you choose — hourly is the shortest useful one. The code executes with the access of the person who owns the account, because it is running in their account. Nothing external is authenticated; there is nothing external.
That single property is what makes the pattern interesting for monitoring. A script can read what the account knows about itself — impressions, clicks, cost, conversions, campaign and ad status, policy limitations — and send those figures to a URL. From the outside tool's point of view the account is a client posting data to it, not a resource it reaches into. The tool holds no credentials and cannot sign in, because there is nothing to sign in to.
What that buys, in practice
Setup is a paste. Copy the file into the account, set the schedule, run it once. There is no permission grant to review, no service account to provision, no waiting on an approval from whoever administers the MCC.
The data is the account's own. A script reads the same reports the interface does, which means the figures you monitor and the figures you would see by opening the account are the same figures. Nothing is inferred from clicks or reconstructed from a tag.
Revocation is deletion. Turning the integration off means deleting a file from the account. It does not involve the outside tool at all, and it cannot be forgotten in a settings page somewhere.
Nothing touches the landing page. A script reads the advertising account, not the traffic. There is no snippet on your pages, no cookie, no additional request between your ad and your offer.
Where it stops
Two limits matter, and a tool that hides them is not being honest with you.
It runs on Google's schedule, not yours. An hourly script runs approximately hourly. That is plenty for "an account stopped spending" and "approvals fell through the floor" — both of which unfold over hours — and it is not a real-time feed. Any claim of instant detection built on scripts is a claim about something else.
A new version has to be pasted in again. The file lives in the account, which is exactly why nobody else can reach it — and it is also why nobody else can update it. When the script gains a capability, every account running the old file keeps working and keeps reporting what it already knew how to report, and each one needs the new file pasted in by hand. For twenty accounts that is an afternoon. For three hundred it is a project, and worth knowing before rather than after.
What it does not do by itself
Reading is one direction. If a tool also acts — pausing an ad, stopping a campaign, changing a budget — that action has to run somewhere too, and with a script the answer is the same: it runs in the account, from a queue the account's own script picks up on its next pass.
Which is a fair description of the trade. Nothing outside the account can act on it directly, so nothing outside the account can act on it by mistake either — but everything that does happen happens on the account's schedule, not on the schedule of whoever pressed the button.
That is the shape of the approach: no credentials, no OAuth, no code on your pages, and in exchange a cadence measured in the hour rather than the second, plus a file you own and therefore have to maintain.