Define messaging extension action commands


The code samples in this section are based on 4.6 and later versions of the Bot Framework SDK. If you're looking for documentation for earlier versions, see the Messaging Extensions - v3 SDK section in the Resources folder of the documentation.

Action commands allow you present your users with a modal popup (called a task module in Teams) to collect or display information, then process their interaction and send information back to Teams. Before creating your command you'll need to decide:

  1. Where can the action command be triggered from?
  2. How will the task module be created?
  3. Will the final message or card be sent to the channel from a bot, or will the message or card be inserted into the compose message area for the user to submit?

Choose action command invoke locations

The first thing you need to decide is where your action command can be triggered (or more specifically, invoked) from. By specifying the context in your app manifest, your command can be invoked from one or more of the following locations:

  • The buttons at the bottom of the compose message area.
  • By @mentioning your app in the command box. Note: You cannot respond with a bot message inserted directly into the conversation if your messaging extension is invoked from the command box.
  • Directly from an existing message via the ... overflow menu on a message. Note: The initial invoke to your bot will include a JSON object containing the message from which it was invoked, which you can process before presenting them with a task module.

Choose how to build your task module

In addition to choosing where your command can be invoked from, you must also chose how to populate the form in the task module for your users. You have three options for creating the form that is rendered inside the task module:

  • Static list of parameters - This is the simplest option. You can define a list of parameters (input fields) in your app manifest the Teams client will render. You cannot control the formatting with this option.
  • Adaptive card - You can choose to use an adaptive card, which provides greater control over the UI, but still limits you on the available controls and formatting options.
  • Embedded web view - If you need complete control over the UI and controls, you can choose to embed a custom web view in the task module.

If you choose to create your task module with a static list of parameters, the first call to your messaging extension will be when a user submits the task module. When using an embedded web view or an adaptive card, your messaging extension will need to handle an initial invoke event from the user, create the task module, and return it back to the client.

Choose how the final message will be sent

In most cases, your action command will result in a card inserted into the compose message box. Your user can then decide to send it into the channel or chat. The message in this case comes from the user, and your bot will not be able to edit or update the card further.

If your messaging extension is triggered from the compose box or directly from a message, your web service can insert the final response directly into the channel or chat. In this case, the adaptive card comes from the bot, the bot will be able to update it, and the bot can also reply to the conversation thread if needed. You will need to add the bot object to your app manifest using the same Id and defining the appropriate scopes.

Add the command to your app manifest

Now that you've decided how users will interact with your action command, it is time to add it to your app manifest. To do this you'll add a new composeExtension object to the top level of your app manifest JSON. You can either do so with the help of App Studio, or manually.

Create a command using App Studio

The following steps assume you've already created a messaging extension.

  1. From the Microsoft Teams client, open App Studio and select the Manifest Editor tab.
  2. If you've already created your app package in App Studio, chose it from the list. If not, you can import an existing app package.
  3. Click the Add button in the Command section.
  4. Choose Allow users to trigger actions in external services while inside of Teams.
  5. If you want to use a static set of parameters to create your task module, select that option. Otherwise, choose to Fetch a dynamic set of parameters from your bot.
  6. Add a Command Id and a Title.
  7. Select where you want your action command to be triggered from.
  8. If you're using parameters for your task module, add the first one.
  9. Click Save
  10. If you need to add more parameters, click the Add button in the Parameters section to add them.

Manually create a command

To manually add your action-based messaging extension command to your app manifest, you'll need to add the follow parameters to your composeExtension.commands array of objects.

Property name Purpose Required? Minimum manifest version
id Unique ID that you assign to this command. The user request will include this ID. Yes 1.0
title Command name. This value appears in the UI. Yes 1.0
type Must be action No 1.4
fetchTask true for an adaptive card or embedded web view for your task module, false for a static list of parameters or when loading the web view by a taskInfo No 1.4
context Optional array of values that defines where the messaging extension can be invoked from. Possible values are message, compose, or commandBox. Default is ["compose", "commandBox"]. No 1.5

If you are using a static list of parameters, you'll add them as well.

Property name Purpose Required? Minimum manifest version
parameters Static list of parameters for the command. Only use when fetchTask is false No 1.0 The name of the parameter. This is sent to your service in the user request. Yes 1.0
parameter.description Describes this parameter’s purposes or example of the value that should be provided. This value appears in the UI. Yes 1.0
parameter.title Short user-friendly parameter title or label. Yes 1.0
parameter.inputType Set to the type of input required. Possible values include text, textarea, number, date, time, toggle. Default is set to text No 1.4

If you are using an embedded web view, you can optionally add the taskInfo object to fetch your web view without calling your bot directly. If you choose to use this option, the behavior is similar to using a static list of parameters in that the first interaction with your bot will be responding to the task module submit action. If you are using a taskInfo object, be sure to also set the fetchTask parameter to false.

Property name Purpose Required? Minimum manifest version
taskInfo Specify the task module to preload when using a messaging extension command No 1.4
taskInfo.title Initial task module title No 1.4
taskInfo.width Task module width - either a number in pixels or default layout such as 'large', 'medium', or 'small' No 1.4
taskInfo.height Task module height - either a number in pixels or default layout such as 'large', 'medium', or 'small' No 1.4
taskInfo.url Initial web view URL No 1.4

App manifest example

The below is an example of a composeExtensions object defining two action commands. It is not an example of the complete manifest, for the full app manifest schema see: App manifest schema.

"composeExtensions": [
    "botId": "12a3c29f-1fc5-4d97-a142-12bb662b7b23",
    "canUpdateConfiguration": true,
    "commands": [
        "id": "addTodo",
        "description": "Create a To Do item",
        "title": "Create To Do",
        "type": "action",
        "context": ["commandBox", "message", "compose"],
        "fetchTask": false,
        "parameters": [
            "name": "Name",
            "description": "To Do Title",
            "title": "Title",
            "inputType": "text"
            "name": "Description",
            "description": "Description of the task",
            "title": "Description",
            "inputType": "textarea"
            "name": "Date",
            "description": "Due date for the task",
            "title": "Date",
            "inputType": "date"
        "id": "reassignTodo",
        "description": "Reassign a todo item",
        "title": "Reassign a todo item",
        "type": "action",
        "fetchTask": true,

Next steps

If you are using either an adaptive card or an embedded web view without a taskInfo object, you'll want to:

If you are using parameters or an embedded web view with a taskInfo object, the next step for you is to:

Learn more

Try it out in a quickstart: