Taking a Spin With the Teams Toolkit

July 08, 2021

At Microsoft Build 2020, the Teams Development team announced the preview version of the Teams Toolkit. I have been fortunate to see this go from napkin stage all the way to general availability. I thought it would be fun to take it out for a quick test. You can read all about on Microsoft Docs.

My Project

This should be a very easy project. I have a project currently in process that spans multiple GitHub repositories. We do all of issue tracking via GitHub. For every project that has a user experience tied to it, we build in a very simple “feedback” form so users (internal, external, whomever) can provide us with feature requests, bugs or whatever other thoughts they have. Our project management team has asked to be able to see all of the GitHub issues but they don’t want to have to browse to all of these repositories. So using the Octokit.NET we built a REST endpoint that we can pass any number of repository names and it will return all of the issues that are open across all the collection.

So I want to build a channel tab that I can put inside the project so the project management team can see all the open issues in a single spot.


To use the new Teams Toolkit, all you need to do is install it in Visual Studio Code. Head over to extensions in Visual Studio Code, search for Teams Toolkit and there you go.

Setup Image

Next we need to create a new project. Inside of Code you will see a new Teams icon on the left rail. Go ahead and click on it and you will see a list of different options.

Create New Teams App

Click on Create a new Teams app. This will prompt you for a name for your application. I’m going to call my application GitHubForTeams.

Name Teams App

It will prompt you where you want to save the workspace at. Visual Studio Code is going to create a folder for you in this case. So it’s asking, what is the parent folder you want to store this in. So in my case, I’m just putting it with all of my repositories. After that you will be presented with a wizard to decide what items you want to add to your project. In my case, I’m going to add a tab.

Add Capabilities

Since I selected a tab in this instance, it’s going to ask if I want a personal tab or a Group/Channel tab. In my case we want to go with the Group/Channel tab.


At this point in time, I’m finished. It’s all setup and I’m ready to go. You will see a welcome screen, telling you exactly what you need to do to use the tool. We can interact with our application both as a local host but also within Teams. The readme does tell you what you need here but I’ll detail it with screenshots as well for you.


So our first step is to run:

npm install

NPM Install

This is going to take a bit of time as it downloads all of the necessary items for your project. Remember, this isn’t just about creating the Manifest, but instead we are going to create everything needed for this project including the website files and more. Once npm install is done, run:

npm start

NPM Start

Now that you have started your application you can open it in the browser. When you first go the page, you will met with a Connection Error.

Private Browser

Remember, the read me tells you need to accept the local cert. Yes, you could use the Advanced Button and simply “continue” for the browser but this won’t work then for Teams. So you need to actually install the cert. That process is thankfully pretty easy. I’m using Edge 85 for this. Same instructions work for any version of Chrome as well.

  1. Open the Chrome Developer Tools window F12 or you can use (ctrl + shift + i)
  2. Go to the Security tab
  3. Click on View Certificate. Click on the Details tab and choose “Copy to File”. This is going to walk you through a wizard, you can hit next-next-next through the entire wizard. At the end, you will be asked to name the certificate. Save it somewhere you will know.

Now we need to install this into your computer.

  1. Go to where you have the cert, right-click and choose Install Certificate.
  2. Choose Local Machine. It will then ask where you want to store the certificate, pick Trusted Root Certificate Authorities.
  3. You can now click next-next-next and finish. It should tell you the certificate was imported successfully.

Now you can try to go back to your webpage. However, you will most likely notice that you are still getting a certificate error. Why? Because the address in Code tells you to go to But is my IP Address and that will NEVER be on a certificate. Change it to https://localhost:3000/. The error will be gone.

When you visit the webpage, it is complete blank! This is because it’s not in Teams but just a browser. If you try to go to https://localhost:3000/tab/ it will tell you you are not in Teams. So now let’s get this into Teams.

First, you need to make sure your Teams client is configured for Developer Preview mode. All you need to do is select your Profile picture, choose About and select Developer Preview.

Teams Client

It will ask if you want to switch to Developer Preview and simply say yes.

Developer Preview

From the Welcome Page, click on the Edit App Package. If you have not signed in previously, you will be met with a large “Sign In” page.


Go ahead and sign-in. If this really is your first time, you will be met with an Azure Authentication page to give your profile permission to the Teams App Configuration tool. I’m not a huge fan that it says “unverified” but it is safe. Go ahead and click Accept.

App Details

NOTE: If your organization has disabled individual permissions to be granted in Azure, you will be told that your do not have sufficient permissions and you need to contact your administrator. They will need to put the Teams App Configuration tool on the allow list in Azure.

Next you need to configure your application. By default, everything is going to be fill out for you. You can modify these settings now if you want or you can do it later. Its completely up to you.

Action Needed

When I hit update, I got a message about a mismatch between my App Config and my Local Project. In my case, it was just a trailing / was missing. I tried using both of the two options presented, but the message just kept coming up. So I went to App Details and changed the Website to https://localhost:3000/

App File

Now you can hit the Update button. We now want to side-load this into our Teams client. To accomplish that, we need to browse to the location of our project. When we hit the Update button, under the hood the a development.zip file has been created in the .publish folder.

Install Teams App

IMPORTANT! This development.zip file is your local copy of your configuration. If you delete it, then you just deleted your App Manifest. Don’t do that!

We go back to our Teams client and click on the Apps in the lower left corner. Choose Upload a Custom App and browser to the folder where the development.zip file is located. And click Add to a team

Select Channel

Use the picker and select a team. In my case I’m going to use my Testing Group | General. Click Setup a tab.

Tab Config

Now we just need to add the tab to the channel. So click the + like you normally would, find your new GitHubForTeams app and add it.

Tab Config

And that is it. You should now have your new tab added to Teams! In my next post, we are going to go through what Microsoft has pre-built for you, add the stuff we need to complete this application and do some testing.



Written by Richard Richard is an Office Apps & Services MVP (Teams / Skype) who lives in Minneapolis, MN. Microsoft Certified Solutions Master (MCSM) and MCSM Instructor - when those were a thing long ago. When not writing code, breaking teams - debate coach and avid golfer.
Follow on Twitter

Built using Gatsby and Material-UI

Copyright © TheArgyleMVP 2022.