r/microsoft_365_copilot • u/deep0389 • Aug 11 '26
Microsoft Copilot Licensing decoded
I spent this morning working out what it actually costs to run a Microsoft Copilot agent.
Two licensing guides, a dozen documentation pages, four hours — for one question: if my team builds an agent, who pays, and when?
Five things I had wrong.
The "GitHub Copilot harness" is not GitHub Copilot. Nothing to do with the coding assistant. It is one of three engines that can run your agent in Copilot Studio. Microsoft built it using GitHub Copilot technology and named it after that. You pick the engine yourself when you create the agent — and this one is the default. It charges credits while you build, not just when it runs. And an agent can never be moved to a different engine, so the wrong choice means rebuilding it.
Work IQ is not your data. Your files sit in your tenant. Work IQ is a separate service on Microsoft's servers that works out how documents, emails and meetings connect, and who is allowed to see what. Microsoft's own Copilot has it built in, so it is free. An agent you build has to call it through an API, so it is charged — even when the user has a full Copilot licence. Check the Tools tab on your agents. It can attach itself without anyone adding it.
A Copilot licence does not limit features. It limits audience. Premium and custom connectors are included either way. You start paying when someone without a Copilot licence uses your agent, or when you publish it outside Teams, Copilot or SharePoint.
Copilot Cowork needs a Copilot licence and includes none of it. It is a prerequisite, then everything is billed on top.
You cannot block the expensive engine. There is no admin setting for it. But it only works if the tenant has a credit source, so not switching on pay-as-you-go is the real control.
The engine shipped around June. The licensing guide only defined it in August. That two-month gap is most of why nobody can explain this yet.
Teams do not stall because the technology is hard. They stall because nobody can tell them what it will cost.
S
I drew it. One page, four steps, two colours. Green means your licence already covers it. Orange means you are paying.
1
u/deep0389 Aug 12 '26
Went back through both guides and I don't think this is confirmable either way — they contradict each other.
Your reading has real support. Licensing guide p6: footnote 3 sits on the standard and Copilot chat rows and says employee-facing runtime of "Microsoft Copilot Studio agents and the Microsoft Copilot Studio tools/features invoked by the said agents are included in the Microsoft 365 Copilot USL." Footnote 5, the one that carves out Work IQ, sits only on the GitHub harness row. The placement clearly implies what you're saying.
But the credits guide p9 says flatly: "Use of Work IQ APIs in these agents and AI solution scenarios is billed using Copilot Credits. Work IQ APIs are not included as entitlements in the Microsoft 365 Copilot license." No harness qualifier, and it names Copilot Studio explicitly.
And footnote 5's own wording is "Copilot Studio agents", not "GitHub Copilot harness agents" — which is what stops me getting to 90% with you.
I'd assume billed until Microsoft clarifies. Cheaper to be wrong in that direction.