Open Word tomorrow morning, and you might not notice anything unusual. The Copilot pane is still where you expect it to be. The big difference comes after you ask it to do something.
Until recently, Copilot was mostly there to help you. You asked it for a draft, an idea, or an answer, and then finished the job yourself.
With Agent Mode, you can hand over more of the work.
That’s the change Microsoft is bringing to Word and Excel. Since Build 2026, users no longer need to look for or switch on Agent Mode.
It’s the default experience. Here’s what that means in practice and where it can save you time.
From Suggestion Box to Doing the Work
The old Copilot experience was straightforward. You opened the chat pane, typed a request, got a response, and decided what to do with it.
If you wanted to rewrite a section of a report, for example, Copilot could give you the rewritten text. You still had to put it where it belonged and make the rest of the document work.
Agent Mode takes more of that work off your plate.
You give it the outcome you’re looking for, and it can work directly in the document or workbook. It can make changes across several steps rather than stopping after one answer. Native undo and autosave are there too, which makes experimenting with it a lot less uncomfortable.
Satya Nadella announced it was reaching general availability on 22 April 2026, and by Build 2026 in June, Microsoft confirmed the next step: Agent Mode became the default experience across Word and Excel for Microsoft 365 Copilot and Microsoft 365 Premium subscribers.
What It Actually Does in Word
Word is probably the easiest place to see why this matters.
Imagine you’ve got a technical document that’s useful but far too detailed for a senior management meeting.
Instead of asking Copilot for a shorter version and then spending another hour fixing the document, you can tell Agent Mode what you need: turn this into an executive report, keep the key findings, reorganise the sections, and make it suitable for the audience.
It can then make those changes in Word itself. It can draft, restructure, and format the document using Word’s native styles.
It doesn’t always have to guess, either. If your request isn’t clear enough, it can ask for more information before continuing.
Microsoft has also highlighted a Contract Review Agent that can scan a Word document for compliance risks and flag areas that may need attention before a person carries out a detailed review.
That is probably the simplest way to explain the difference between the two approaches. The old Copilot was closer to “help me with this.” Agent Mode is closer to “take care of this and let me review it.”
What It Actually Does in Excel
Excel is where things get particularly interesting.
Many people are comfortable entering numbers into a spreadsheet but less comfortable building complex formulas, analysing large datasets, or deciding which charts tell the story. Traditionally, that meant asking someone with stronger Excel skills for help.
Agent Mode can handle more of that initial work.
Give it a request such as “run a full analysis on this sales dataset”, and it can explore the data, build formulas, create tables and produce visualisations. It also gives you a summary of what it did, so you have visibility into the process.
It can also build multi-tab workbooks from a natural-language request. Data can sit in one area, analysis in another, and charts somewhere else, rather than throwing everything onto a single sheet.
There’s an even simpler use case that many teams will probably appreciate. You can give it an existing workbook and ask what a complicated formula is doing.
Who Actually Has It
This is the part worth checking before making any plans.
Agent Mode is available to subscribers with the Microsoft 365 Copilot add-on for business and enterprise, and to Microsoft 365 Premium and Family subscribers. Organisations using standard Microsoft 365 plans without the Copilot add-on won’t see it by default.
In other words, don’t assume that everyone in the organisation automatically has access. Check the licence first.
Agent Mode is also powered by Work IQ, the same context engine that grounds Copilot across Microsoft 365. The idea is that Copilot can reason over the files and data you actually work with rather than relying only on general information.
That’s connected to the wider development we’ve covered in our guide to multi-model AI in Copilot, where the model behind the experience increasingly matters depending on what you’re asking it to do.
Making the Most of It Rather Than Just Clicking Around
New AI features tempt you to try a few random prompts, see something impressive, and then forget about the feature a week later.
Agent Mode is more useful when you treat it as part of the workflow.
Start by telling it what you want to end up with. You don’t necessarily need to explain every step. If the goal is to build a dashboard tracking regional sales against target, say so. Let the agent work out the individual steps.
Then check its work.
That’s particularly important with Excel. A chart can look perfectly reasonable yet be based on the wrong range. A formula can look fine yet still be wrong. Microsoft is clear that agentic AI can make mistakes, so just because it completed a task doesn’t mean you should stop reviewing the result.
For work that keeps coming up, think a little further.
If a task normally takes someone an hour every Friday, could an agent handle most of it instead? That’s part of the broader shift we’ve explored in our piece on Copilot Cowork, which looks at longer-running, multi-step work beyond a single document.
The Bigger Pattern Worth Noticing
Agent Mode in Word and Excel isn’t about a single new feature. It’s another example of where Microsoft 365 is heading.
AI used to be mainly about getting an answer. Now Microsoft is asking it to do something with that answer.
We’ve seen the same direction with GPT-5.6 becoming the preferred model in Copilot, as well as with the agentic capabilities appearing across Dynamics 365 and the Power Platform.
Word and Excel may be where most people first notice the change, simply because they’re already using them every day.
Conclusion
Agent Mode becoming the default in Word and Excel is a bigger change than another button appearing in Copilot.
The applications themselves haven’t changed overnight. Word is still Word and Excel is still Excel. What’s different is how much of the work you can hand over.
Instead of asking Copilot for help at a single step, you can give it a larger task, let it work through it, and then review what comes back.
If you’d like help rolling out Agent Mode properly, training your teams to use it well, and ensuring your data foundation supports it, that’s exactly what we do. As an ISO 27001–certified Microsoft partner, Stallions Solutions helps organisations get real value from Microsoft 365 Copilot.
Book a free assessment, and we’ll help you make the most of it- honest advice, no hard sell.
Frequently Asked Questions
What is Agent Mode in Microsoft 365 Copilot?
Agent Mode is an agentic capability in Word and Excel that can carry out multi-step tasks directly within a document or workbook. Rather than merely suggesting what you should do, it can draft, restructure and build content based on the goal you set.
Is Agent Mode on by default?
Yes. As of Build 2026, Agent Mode is the default experience in Word and Excel for subscribers with the Microsoft 365 Copilot add-on or Microsoft 365 Premium, rather than an optional mode.
Do I need a special licence for Agent Mode?
Yes. It’s included with Microsoft 365 Copilot (the enterprise add-on) and with Microsoft 365 Premium or Family plans. Standard Microsoft 365 plans without the Copilot add-on won’t include it by default.
Can Agent Mode make mistakes?
Yes. Like any AI feature, it can misinterpret data or produce inaccurate results. People should still review important documents, calculations, and business decisions.
How is Agent Mode different from the old Copilot chat pane?
The old experience answered questions and provided suggestions that you then had to apply yourself. Agent Mode can work directly in the file, including drafting, editing and building content. Native undo also lets you roll back changes when necessary.
