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How to give an AI agent access to your calendar without breaking anything

By the Viacala team · 9 October 2026 · 6 min read

A routine that reads your calendar and prepares you for every call is one of the most useful things you can automate. It is also an AI with access to your diary, so how you set it up matters more than what it does.

What we actually let it do

Every morning a routine of ours reads the day's calendar. For each meeting with someone outside the company it looks the person up in our CRM, reads their public website, and writes a preparation document: who they are, what we know, what to ask, what objections to expect. Meetings that are internal only are skipped. At the end it writes a single line to our daily log saying how many meetings it found and how many it could match to a record.

That is the whole job. It is useful because it replaces twenty minutes of looking people up before each call. It is safe because of what it is not allowed to do.

The four decisions that keep it safe

1. Read access first, write access only where it is needed. The routine lists events. It never creates, accepts, declines or edits one. Our instructions enforce that, which is weaker than a connection that is read-only by permission. If your calendar tool lets you grant read-only access, choose that and treat the instructions as a second layer, not the first.
2. The output is a document, not an action. The worst outcome of a bad run is a poor briefing we read and ignore. There is no path from this routine to an email going out or an invitation changing.
3. It must say what it did not verify. The briefing separates what comes from our own notes from what is only a pattern for that type of business. A guess presented as a fact is the failure that costs you credibility in a real call.
4. Pages it reads are data, not instructions. A website or an invitation can contain text written to steer an AI. We design so that nothing the routine reads can cause it to send or change anything, because it has no way to. We go through why that matters in our piece on the UK AI Security Institute incident.

What can still go wrong

It can match the wrong person if two people share a name or an email domain, which is why every briefing says whether a CRM record was found. It can read a website that is out of date. It can run late or not at all if the machine it runs on is asleep. None of these is dangerous, and all of them are visible in the log line, which is the point of writing one.

What to ask before you connect an agent to your calendar

1. What can it do with the calendar? Read only, or read and write?
2. What can it send? If the answer includes email, messages or invitations, who approves each one?
3. Where does its output go, and who reads it?
4. How would you know it had stopped working? A routine that fails silently is worse than none.

An agent that prepares you for the day is one of the easiest wins in a small business, and one of the safest if it is scoped this way. How we set up that kind of work is part of the AI agents we set up for Mallorca businesses.