The build itself is a low-code exercise. The licence maths is where projects stall, so read that section before you start.

What can a Copilot Studio agent do?

Three levels of capability, often mixed in one agent.

• Conversational Q&A: answers from a knowledge source you point it at
• Actions: calls a Power Automate flow to do something, like open a ticket
• Generative orchestration: decides on its own which tool or topic to use

Most working agents use the first two. Generative orchestration is powerful and unpredictable, so pilot it before enabling it for users.

How do you create a basic agent?

Sign in at copilotstudio.microsoft.com, create an agent, and give it a name and a description in natural language. The description guides behaviour more than people expect, so write it like a job spec rather than a label.

Then add a knowledge source: a SharePoint site, a public website, or an uploaded document. Indexing a small SharePoint library takes a few minutes.

How do you add an action that touches a real system?

Go to Actions, create a new one, and either pick an existing Power Automate flow or build a connector call. Typical first action: look up an order. Point it at your ERP connector or an HTTP call, define the input as an order number and the output as a status string.

Test in the built-in preview pane before publishing. Failures there are almost always authentication, not logic, so check the connection first.

How do you publish it?

Publish to Teams, a website, or a custom channel like a mobile app. Teams is the fastest route and where most internal agents belong. Publishing to a public website requires a separate authentication decision, so involve your security team early.

What does it cost?

Two costs stack. The author needs a Copilot Studio licence, and each tenant that consumes messages is billed per message bundle, with rates differing by channel. A lightly used internal agent can cost a few hundred dollars a month; a customer-facing one handling thousands of conversations costs far more. Model your message volume before a wide rollout, because the consumption bill, not the licence, is the surprise.

Where do these agents fail?

They answer confidently from stale knowledge sources, so indexing needs a maintenance owner. Topic collisions cause the agent to pick the wrong path when two topics sound similar. And agents that touch internal systems without logging are an audit problem, so wire the actions into your existing logging on day one.

This is worth building when a support or HR team answers the same twenty questions daily. It is not worth building for a process that changes every month.

Key Takeaways

• Copilot Studio builds custom agents with knowledge sources and Power Automate actions.
• A useful first agent answers from SharePoint and looks up one record in a system.
• Write the agent description like a job spec; it shapes behaviour.
• Costs include a licence plus per-message bundles that vary by channel.
• Stale knowledge and topic collisions are the most common failure modes.

This guide covers the embedded version, because that is where the useful work happens.

What does Copilot actually do in each app?

The capabilities differ enough that treating it as one product leads to disappointment.

How do you start using it in Word?

Open the Copilot pane from the ribbon. Reference a file with a slash command, then give an instruction. “Draft a 400-word summary of /Q3report.docx for the finance committee” produces a usable first pass.

The trap is formatting. Copilot’s output inherits whatever style is active at the cursor, so generate into a clean section, then apply your real styles.

How does Excel Copilot work?

Select a range or a table, open Copilot, and describe the outcome rather than the formula. “Show monthly revenue growth as a column chart with the YoY percentage in a new column” is a good request. It writes the formula and explains it, which is genuinely useful for learning functions like XLOOKUP.

Limits matter here. Very large sheets slow it down or produce errors, and it cannot reason across multiple workbooks.

Is Copilot in Microsoft 365 free?

No. It requires a Microsoft 365 Copilot licence, around $30 per user per month on top of your existing Microsoft 365 subscription. There is a free Copilot chat on the web, but it does not access your tenant files. For a ten-person team, that licence line is roughly $3,600 a year before any seat discount, so pilot it on two people before rolling out.

Where does it fall short?

Meeting recaps depend on Teams transcription being enabled, which many organisations turn off for privacy. Excel breaks on very large datasets. And Copilot will confidently summarise a document it only partially retrieved, so verify anything going to a client. It also cannot act across apps in one instruction, despite what demos suggest.

It fits organisations already standardised on Microsoft 365 where the data is already in SharePoint and OneDrive. It is a poor fit for teams outside the Microsoft ecosystem.

Key Takeaways

• Copilot in Microsoft 365 is separate from the free web chat and costs about $30 per user per month.
• It works best in Word for drafting and Excel for formulas and charts.
• Teams recaps require transcription to be enabled.
• Excel Copilot degrades on very large datasets.
• Best value for organisations already living inside Microsoft 365.