SharePoint Skills, SharePoint agents, Copilot Studio agents, and Power Automate flows overlap enough to be confusing and differ enough to matter. Pick the wrong one and you either under-build the solution or overbuild the problem.
This is the decision framework I use. It answers the short question first ("which one?") and then explains the trade-offs so you can defend the call.
The one-line verdict up front: if the work stays inside one SharePoint site, use a Skill. If you need to answer questions about content, use a SharePoint agent. If you need to reach across the tenant or connect to another system, use Copilot Studio. If you need an event trigger or a scheduled run, use Power Automate.
The short answer
Four tools, four jobs.
| If you need to... | Pick |
|---|---|
| Run a repeatable multi-step workflow on one site's content | AI in SharePoint Skill |
| Answer questions about documents in a site or library | SharePoint agent |
| Run a workflow that spans SharePoint plus another system | Copilot Studio agent |
| Trigger on an event or run on a schedule | Power Automate flow |
A solution using more than one of these is fine. A Copilot Studio agent calling a Power Automate flow is common. A SharePoint agent and a Skill living on the same site is common. The real question is which tool is right for a specific job, not which one to use for everything.
What is an AI in SharePoint Skill?
A Skill is a Markdown file at /Agent Assets/Skills/<name>/SKILL.md in a SharePoint site. It captures a repeatable multi-step workflow in natural language. Anyone on the site with Edit permission can create one. Anyone with View permission can run it.
Skills are bounded by design. They cannot call external systems, run custom code, or expand a user's permissions. They can summarise documents, organise files, update SharePoint lists, and chain those actions together, but only on the site they live on.
For the full picture, see what SharePoint AI Skills are and the pillar on extending SharePoint AI with Skills.
What is a SharePoint agent?
A SharePoint agent is an AI assistant scoped to a site or to a selection of documents. Its job is to answer questions, summarise content, and help users find what they need inside the scoped content. Every modern SharePoint site gets a default agent automatically when Microsoft 365 Copilot is enabled.
Site owners can also create custom agents grounded on up to twenty sources (sites, libraries, folders, or files). A custom agent respects SharePoint permissions, so users only see content they are already permissioned to see.
Agents respond. Skills act. That is the clearest line between them.
What is a Copilot Studio agent?
A Copilot Studio agent is a low-code AI assistant built in copilotstudio.microsoft.com. It can use SharePoint as a knowledge source, but also Dataverse, Power Apps, external databases, third-party SaaS, custom APIs, and Microsoft Graph.
Copilot Studio agents can take actions, not just answer. They can trigger Power Automate flows, update records in external systems, post messages, or send emails. They can live in Teams, on a website, inside Microsoft 365 Copilot chat, or in a custom app.
The trade-off is complexity. A Copilot Studio agent is a project, not a Skill. Expect to invest hours, not minutes, and to think about authentication, connectors, and data residency.
What is a Power Automate flow?
Power Automate is a workflow engine. Flows trigger on events (a file added, a list item updated, a Teams message posted) or on a schedule (every Monday at 09:00). They run a sequence of actions across Microsoft 365 and hundreds of connected services.
Power Automate has been around for years and predates the AI agent family. It is still the right tool for event-driven automation. AI in SharePoint Skills are user-invoked, so they are not a Power Automate replacement for anything that has to run automatically.
Head-to-head at a glance
| Dimension | Skill | SharePoint agent | Copilot Studio agent | Power Automate |
|---|---|---|---|---|
| Lives in | SharePoint site | SharePoint site | M365 tenant | M365 tenant |
| Scope | One site's content | Scoped site or files | Any source via connectors | Any source via connectors |
| Action taking | Yes | No, Q&A only | Yes | Yes |
| External systems | No | No | Yes | Yes |
| Custom code | No | No | Limited (Power Fx) | Yes |
| User trigger | Yes | Yes | Yes | Optional |
| Event trigger | No | No | Limited | Yes |
| Scheduled run | No | No | Limited | Yes |
| Dev skills | None | None | Low-code | Low-code |
| Licence | M365 Copilot | M365 Copilot or PAYG | Copilot Studio | Varies |
When to pick Skills
Pick a Skill when the work is:
- Multi-step and repeatable.
- Confined to one SharePoint site's content.
- User-invoked (someone asks for it).
- Describable in plain language.
Classic fits are document validation, metadata tagging, library housekeeping, and per-site review routines.
The moment you need to connect to another system, schedule the run, or have the agent decide to act without user input, stop and pick a different tool.
When to pick SharePoint agents
Pick a SharePoint agent when the work is:
- Question-answering or content discovery.
- Scoped to a site or a set of documents.
- About reading, summarising, and retrieving, not updating or acting.
Classic fits are policy lookups, onboarding FAQs, project knowledge bases, and document search with conversational access.
If users need to ask and receive, that is agent territory. If they need something done, that is Skill or Copilot Studio territory.
When to pick Copilot Studio agents
Pick Copilot Studio when the work is:
- Cross-system or external. SharePoint plus Dynamics, Salesforce, ServiceNow, or a custom API.
- Action-taking, not just answering.
- Multi-channel. Same agent in Teams, on a website, in Copilot chat.
- Governed. You want audit, approval, and connector-level DLP.
Classic fits are HR self-service that updates records, sales agents that draft emails and log CRM activity, and IT help-desk agents that triage tickets.
Skills cannot do any of those. Copilot Studio can.
When to pick Power Automate
Pick Power Automate when the work is:
- Triggered by an event, not a user prompt.
- Scheduled.
- A sequence of conditional steps across systems, without AI reasoning.
- Something you already know how to describe as a flowchart.
Classic fits are approvals when a list item is added, nightly data sync between systems, email-driven file intake, and scheduled reports.
Power Automate and Copilot Studio agents often sit together. The agent decides, the flow executes. Skills do neither side of that pattern.
The decision in one sentence
Skills for inside one site, agents for Q&A, Copilot Studio for cross-system work, Power Automate for events. Build the first version with the smallest tool that does the job. Step up only when you hit its boundary.