When Microsoft released Copilot Cowork, the conversation quickly became about what it could do. That it just isn’t a chat partner. It is actually an assistant that can execute tasks on your behalf.
Having an AI agent that can perform multiple steps, reason over your Microsoft 365 data, and complete complex tasks without constant supervision is a big step forward.
But there is another side to the story that has brought on alot of discussions as well.
Every time you ask Cowork to perform a task, you spend Copilot credits.
That means that the quality of your prompt suddenly matters more than ever.
Every retry has a cost
We have all done it, and most likely do it every day.
You write a prompt, press Enter, look at the result and realize you forgot something important. You then make a few changes, and run it again. And so on. With a normal chat experience that is mostly an inconvenience that takes time.
With Cowork, every execution consumes credits.
One poorly written prompt can easily become three or four executions before you finally get the result you were after. Multiply that by hundreds or thousands of users across an organization and those extra executions quickly become noticeable.
Not every prompt belongs in Cowork
Since Copilot Cowork became generally available, I have started noticing a pattern.
Many users seem to treat it as the default place to ask Copilot anything. Need to rewrite a paragraph? Open Cowork. Want help improving an email? Open Cowork. Need to brainstorm ideas for a presentation? Open Cowork.
The problem is that these are often tasks that can be handled perfectly well by the standard Copilot experiences, without consuming any Cowork credits.
Cowork is designed for something different. Its real strength is handling complex, multi step work that requires reasoning, gathering information from multiple sources, and producing a finished result with minimal supervision. That is where the investment in credits makes sense.
Using it for everyday prompt refinement or simple writing tasks is a bit like hiring a project manager to write up your shopping list. It will probably work, but it is not exactly the most efficient use of the resource.
Before opening Cowork, it is worth asking yourself a simple question:
Does this task actually require an autonomous agent, or would a regular Copilot conversation be enough?
That small pause can save credits.
If the answer is yes, this really is a task for Cowork, then it is worth spending another minute making sure the prompt is as good as it can be before you press run.
That is where Prompt Coach becomes incredibly useful.
Prompt Coach
If you have not come across it before, Prompt Coach is a built in Copilot capability designed to help you write better prompts. Instead of executing a task itself, it reviews your prompt and suggests ways to make it clearer, more complete, and more likely to produce the result you are looking for.
You can find Prompt Coach directly in Microsoft 365 Copilot. Simply start a new chat and select Prompt Coach from the Agents section. If you don’t already have it installed, you can add it from the Agent Store.
Instead of immediately sending your request to Cowork, you can first ask Prompt Coach to review your prompt. Although it might seem like a fairly simple tool at first glance, I think it has the potential to become one of the most valuable companions for anyone who uses Cowork regularly.
I have found that it helps to be explicit about what you are trying to achieve. For example, I often start the conversation with something like this:
I need to create a prompt for Copilot Cowork. The prompt should be as cost effective as possible while using as few Copilot Credits as necessary.
Prompt Coach will then ask you about your goal and it can point out missing details, suggest improvements, identify ambiguities, and help structure your request so Cowork has a much better chance of succeeding on the first attempt, reducing the need for costly retries..
Think of it as asking a colleague to proofread an important email before you hit Send. You have not started the work yet. You are simply making sure your instructions are as clear as possible.
Imagine you want Cowork to analyse a project, summarize recent meetings, identify outstanding actions, and draft a status report for management.
Your first prompt might look something like this:
Summarize Project Thisandthat and tell me what still needs to be done.
It is a perfectly reasonable request, but it leaves a lot open to interpretation. Which meetings should Cowork analyse? Over what time period? Should it include emails, Loop pages, SharePoint documents, or other sources? How should the final report be presented? Should it highlight risks or simply summarize progress?
Instead of sending that directly to Cowork, ask Prompt Coach to improve it first.
It might suggest something closer to this:
Review all Teams meetings, emails, Loop pages, and SharePoint documents related to Project Thisandthat from the last 30 days. Produce an executive summary, identify completed milestones, outstanding actions, current risks, owners for each action, and recommend priorities for next week. Present the result as a management report with clear headings.
That second prompt gives Cowork much clearer instructions and significantly narrows both the context and the information it should analyse. Instead of deciding for itself which sources and timeframes might be relevant, it can focus on exactly what you need.
The result is often better, and more importantly, you may only need to run it once.
Governance matters here aswell
The conversation around Copilot credits is not only about writing better prompts. It is also about governance.
As organizations begin adopting Cowork, administrators need to think about who should have access to it, how the credits should be consumed, and also about who is responsible for paying for that consumption. Microsoft has already introduced a policy framework that gives organizations much more control than simply turning the feature on for everyone.
Not every user needs access to every agent or every capability just because it is there. Through COst Management policies and administrative controls, organizations can decide which users or groups are allowed to use experiences such as Cowork. That makes it possible to start with a smaller pilot group, gradually expand adoption, or reserve more advanced capabilities for departments that genuinely benefit from them.
There is also the financial side of governance.
Organizations can define credit limits to prevent unexpected consumption and create separate Pay As You Go subscriptions for different business units or departments. Instead of one central IT budget covering every AI execution across the company, individual departments can be responsible for their own usage and costs. Marketing can fund their own campaigns, Legal can pay for document analysis, and HR can cover their recruitment workflows.
With tis in mind, AI is no longer just another IT service. It becomes a business capability with measurable value and measurable costs.
Prompt Coach fits naturally into this governance model. Every unnecessary Cowork execution avoided through better prompt writing is one less credit consumed. Individually the savings may seem small, but across an organization those improvements can have a meaningful impact on both adoption and operational costs.
Good governance has never been about restricting technology.
Change Management and training
If users do not understand that Cowork consumes credits, they are unlikely to think twice before using it for every task, even when a standard Copilot experience would have been a better fit. The platform cannot make that judgement for them. That comes through awareness, training and experience.
This is why change management becomes just as important as the technical configuration. Organizations should explain not only what Cowork can do, they should also educate the users about when it should be used, when another Copilot experience is more appropriate, and how tools such as Prompt Coach can help improve the quality of prompts before credits are consumed.
Successful adoption is not about getting people to use Cowork as often as possible. It is about helping them choose the right tool for the right task. When users understand the strengths of each Copilot experience and the cost model behind them, they are far more likely to deliver better results while making better use of the organizations investment.
A hidden gem
Prompt Coach may not be the agent that gets to shine during the keynote demonstrations, but I believe it could become one of the most valuable tools in the entire Copilot ecosystem. It encourages users to think before they execute, improves the quality of the work being produced and can also help organizations get more value from every credit they consume.
Before spending your next Copilot credit, ask yourself two simple questions:
Does this task really need Cowork?
And if it does, is this the best prompt I can give it?
Those two questions might be the easiest way to improve both the quality of your results and the return on your Copilot investment.
