Create Impressive Videos with Copilot Cowork

Here’s an example of the result: a 24-second video about Copilot Coaching. The steps below show how to set Cowork up for videos like it. A longer prompt lets you set the tone, length, and format.

What you see and hear: 24 seconds, landscape 1920 × 1080, with music and no speech. A quote about prepping for a meeting opens on a dark background, followed by the headline "Four paths, one starting point.", a timeline titled "What happens in 45 minutes", and four tiles under "What do you need help with?". The video closes on "The intro call tells you what fits" with a link to the coaching page. The on-screen text is in English.

What do I need before I start?

• Copilot Cowork with a Microsoft 365 Copilot license and usage-based billing turned on
• A browser or the desktop app: custom skills aren’t available in Cowork on mobile
• One file to read first: the skill’s SKILL.md in the brag repo

What is brag-slim?

brag-slim is a skill from the open-source project brag, published under the MIT license. A skill is a text file of instructions that Cowork loads when a task calls for it. Copilot in PowerPoint: 5 Tricks for Better, On-Brand Slides shows what such a file looks like in trick 3. Give brag-slim a project or a website, and the repo says it returns a short, shareable video with music, motion, and a caption to post.

It’s one file with no bundled assets. The full /brag version needs Node.js 22, FFmpeg, and a tool called Hyperframes, per its README. brag-slim is enough for me. The model handles the rest: story, visuals, sound, render.

Three settings are yours to change. The skill calls them options, but plain sentences work just as well:

Point it at a website, and the skill takes colors, fonts, logo, and images from the site and reuses them in the video. Repo retrieved September 30, 2026.

Here’s a second example, in vertical format (1080 × 1920):

What you see and hear: 24 seconds, vertical 1080 × 1920, with a soundtrack. On a dark background, a prompt box fills with a German request to sort an inbox. The line "After the first hour, you have something you use the next day." (in German on screen) follows, then an example result with a task and a status report, and a customer quote about open emails in which the number drops from 98 to 0. The video ends on a photo, the logo, the address copilot-coaching.de, and a button reading "Anfrage stellen" ("Send an inquiry"). The on-screen text is in German.

How do I get the skill into Cowork?

Just ask Cowork. Start a new task, tell it to install the skill from the repo, and paste the address. Before you do, read skills/brag-slim/SKILL.md in the brag repo. It’s just under eight kilobytes. A skill runs as instructions to the AI, and Microsoft doesn’t vouch for custom skills, so it advises installing them only from sources you trust.

1. Choose New task and send a request like this one:

   Install the brag-slim Skill from this Repo here in Copilot Cowork:
   https://github.com/latent-spaces/brag

2. Cowork reads the repo, then stops and asks before it copies anything.
3. Look at the approval: Copy file, risk level Medium risk, destination skills/brag-slim. Overwrite: Yes means Cowork may replace whatever is already there. Choose Approve.
4. While Cowork works, the side panel lists brag-slim-SKILL.md under Output, next to a report called skill-quality-report.html. Microsoft describes that Cowork evaluates skills automatically when you create them and returns a quality report.
5. Open a new conversation. Cowork picks up your own skills when a session starts.

Prefer to upload the file yourself? Download SKILL.md from the repo, open the + in Cowork, choose Customize and the Skills tab, click the arrow next to Add, and choose Upload skill. Cowork takes a single .md file containing a SKILL.md, up to 1 MB, validates it, and saves the skill to your OneDrive. It can take a moment to show up under Your skills. You can also drop the file into OneDrive at Documents/Cowork/skills/brag-slim/SKILL.md. Microsoft lays out the steps under Upload a skill.

The README’s npx skills add command is for agents like Claude Code. Skip it in Cowork.

How do I make my first video?

Start with one line. Here are two prompts, made up and ready to adapt:

Use brag-slim to make a video from the attached PowerPoint.

Use brag-slim to turn the attached PowerPoint into a vertical video for Instagram.
Length: about 20 seconds. Tone: polished. Keep all on-screen text in English.
Write me a caption to post with it.

Here’s what I typed. /brag-slim at the start calls the skill, the request follows, and the source is a URL, the English coaching page.

What can you hand it? The skill itself names only a project or a website. I tested a PowerPoint, a Word document, and existing videos in Cowork; the repo doesn’t promise them. Drag a file onto the input box, or choose Add attachments, then Upload images and files. Microsoft lists PowerPoint, Word, and several video formats (.mp4, .mov, .avi, .mkv, .webm, .wmv) as supported file types, up to 200 MB per file. For a website, put the URL in the prompt.

Microsoft says Cowork is optimized for English and that other languages depend on the underlying model (as of September 2026). If you want on-screen text in another language, check it closely.

Where does the finished video end up?

In the side panel under Output. Click Download there, or Download All for several files at once. Cowork also saves them in the Cowork folder in your OneDrive.

The skill produces four files: brag.mp4 (the video), brag.jpg (a poster image), share-copy.txt (a caption to post), and brag-plan.md (the plan behind the video). Video isn’t on Microsoft’s list of formats that Cowork previews in the browser, so the safe route is to download the file.

Is the whole video made in the cloud?

I tested it: everything runs in the cloud, and all I need in Copilot Cowork is the skill. Visuals, music, editing, headlines, and transitions all happen in Cowork. Microsoft says Cowork relies on cloud services and needs a stable internet connection. You download the video at the end.

What will a video cost, and what should I check first?

Cowork bills by usage, in Copilot Credits. Model responses, tool and skill calls, image generation, and browser tasks all count. According to Microsoft, the total depends on factors such as the model, the context, and the tools. I set “Extra high” for this video, the second-highest level after “Max.” A higher reasoning level, meaning more thinking effort from the model, uses more credits than “Medium,” the usual default. I haven’t found a price list per task. In my tests, one video came to between 400 and 500 credits. At $0.01 per credit on pay-as-you-go, that’s roughly $4 to $5. Copilot License Cost 2026: Pricing and Credits Explained covers the per-credit price and how the license and credits fit together. That’s what I measured with my settings; yours may differ.

Check three things before you publish:

• Treat the result as a draft. Microsoft advises reviewing the documents, emails, and messages Cowork creates before you pass them on. For a video, that means checking the numbers, claims, and names on screen.
• Upload only material you may share. Your PowerPoint or Word file becomes the source for the video, so anything internal in it may end up on screen.
• Ask your admin whether Cowork and the models are turned on. Admins can switch off individual models, including Anthropic’s.

My take

This tool blows me away. I rarely see a video come out of Copilot that’s this impressive. It feels like a new era: no plug-ins, no MCP servers of my own, just one skill, and it all runs in the cloud. Unbelievable.

If you’d like to try Cowork and your own skills on your day-to-day work, one-on-one coaching is a good place to start.

Sources

• GitHub: latent-spaces/brag, README and skills/brag-slim/SKILL.md (MIT license, retrieved September 30, 2026)
• Microsoft Learn: Copilot Cowork overview, Use Copilot Cowork, Customize Copilot Cowork, Copilot Cowork common questions, Choose a model for Copilot Cowork, Get started with Copilot Cowork, Application card: Microsoft Copilot Cowork

As of September 30, 2026. Microsoft tends to change Cowork’s features and availability quickly, and the skill keeps evolving in the repo.