Google Assistant

Use Home Assistant Cloud to integrate with Google Assistant without any effort.

The google_assistant component allows you to control things via Google Assistant (on your mobile or tablet) or a Google Home device.

The Google Assistant component requires a bit more setup than most due to the way Google requires Assistant Apps to be set up.

To use Google Assistant, your Home Assistant configuration has to be externally accessible with a hostname and SSL certificate. If you haven’t already configured that, you should do so before continuing.


To enable this, add the following lines to your configuration.yaml file:

# Example configuration.yaml entry
  project_id: someproject-2d0b8
  client_id: [long URL safe random string]
  access_token: [a different long URL safe random string]
  agent_user_id: [a string to identify user]
  api_key: [a Homegraph API Key generated for the Google Actions project]
    - switch
    - light
    - group
      name: Custom Name for Google Assistant
        - bright lights
        - entry lights
      expose: false
      room: living room

Configuration variables:

Configuration Variables


(string)(Required)Project ID from the Google Developer console (looks like words-2ab12)


(string)(Required)A long random URL safe string (no spaces or special characters) that will be used for Implicit OAuth (example aBcDeFgHiJkLmNoP)


(string)(Required)Another different long random URL safe string (example aBcDeFgHiJkLmNoP)


(string)(Optional)A string to identify the user, e.g., email address. If not provided, the component will generate one.


(string)(Optional)An API Key generated for the project from Google Console which allows you to update devices without unlinking and relinking an account (see step 9 below). If not provided then the google_assistant.request_sync service is not exposed. It is recommended to set up this configuration key as it also allows the usage of the following command, “Ok Google, sync my devices”. Once you have setup this component you will need to call this service (or command) each time you add a new device that you wish to control via the Google Assistant integration.


(boolean)(Optional)Expose devices in all supported domains by default. If set to false, you need to either expose domains or add the expose configuration option to each entity in entity_config and set it to true.

Default value: true


(list)(Optional)List of entity domains to expose to Google Assistant.


(map)(Optional)Entity specific configuration for Google Assistant


(map)(Optional)Entity to configure


(string)(Optional)Name of the entity to show in Google Assistant


(boolean)(Optional)Force an entity to be exposed/excluded.


(list)(Optional)Aliases that can also be used to refer to this entity


(string)(Optional)Allows for associating this device to a Room in Google Assistant.

Available domains

Currently, the following domains are available to be used with Google Assistant, listed with their default types:

  • group (on/off)
  • input boolean (on/off)
  • scene (on)
  • script (on)
  • switch (on/off)
  • fan (on/off)
  • light (on/off/brightness/rgb color/color temp)
  • cover (on/off/set position (via set brightness))
  • media_player (on/off/set volume (via set brightness))
  • climate (temperature setting)

It’s very important that you use very long strings for client_id and access_token. Those are essentially the credentials to your Home Assistant instance. You can generate them with the following command:

$ cat /dev/urandom | fold -w 120 | head -n 1 | base64 -w 0 | tr -dc '0-9A-Za-z' | cut -c -80

If you’re not using Linux, you can use sites such as this one to generate a random string (containing mixed case letters and numbers) of up to 80 characters.


  1. Create a new project in the developer console.
    a. Add/Import project, give it a name
    b. Click on Home Control card, select the Smart home recommendation
    c. Create an Action, under the build section. Add in your home assistant url: https://[YOUR HOME ASSISTANT URL:PORT]/api/google_assistant, replace the [YOUR HOME ASSISTANT URL:PORT] with the domain / ip address and the port under which your Home Assistant is reachable. If you have set api_password: add this password to the URL - eg https://[YOUR HOME ASSISTANT URL:PORT]/api/google_assistant?api_password=[YOUR API PASSWORD])
    d. Click Done. Then click on Overview, which will lead you back to the app details screen.
  2. Account linking is required for your app to interact with Home Assistant. Set this up under the Quick Setup section a. Leave it at the default No, I only want to allow account creation on my website and select Next
    b. For the Linking type select OAuth and Implicit
    c. Client ID: The client_id from your Home Assistant configuration above
    d. Authorization URL (replace with your actual URL): https://[YOUR HOME ASSISTANT URL:PORT]/api/google_assistant/auth. If you have set api_password: add this password to the URL https://[YOUR HOME ASSISTANT URL:PORT]/api/google_assistant/auth?api_password=[YOUR API PASSWORD])
    e. Configure your client. Add scopes for email and name.
    f. Testing instructions: Enter anything. It doesn’t matter since you won’t submit this app.
  3. Back on the overview page. Click Simulator under TEST - you don’t have to actually test .
  4. If you haven’t already added the component configuration to configuration.yaml and restarted Home Assistant, you’ll be unable to continue until you have.
  5. Open the Google Assistant app and go into Settings > Home Control
  6. Click the + sign, and near the bottom, you should have [test] your app name. Selecting that should lead you the screen where you can set rooms for your devices or nicknames for your devices.
  7. If you want to allow other household users to control the devices:
    a. Go to the settings for the project you created in point 1 in the developer console.
    b. Under the gear icon, click Permissions
    c. Click Add, type the new user’s e-mail address and choose Project -> Editor role
    d. Have the new user go to developer console and repeat steps starting from point 3
  8. If you want to use the google_assistant.request_sync service, to update devices without unlinking and relinking, in Home Assistant, then enable Homegraph API for your project:
    a. Go to the cloud console
    b. Select your project and click Enable Homegraph API
    c. Go to Credentials, which you can find on the left navigation bar under the key icon, and select API Key from Create Credentials
    d. Note down the generated API Key and use this in the configuration

Troubleshooting the request_sync service

The request_sync service requires that the initial sync from Google includes the agent_user_id. If not, the service will log an error that reads something like “Request contains an invalid argument”. If this happens, then unlink the account from Home Control and relink.

The request_sync service may fail with a 404 if the project_id of the Homegraph API differs from the project_id of the Actions SDK found in the preferences of your project on developer console. Resolve this by:

  1. Removing your project from the developer console.
  2. Add a new project to the cloud console. Here you get a new project_id.
  3. Enable Homegraph API to the new project.
  4. Generate a new API key.
  5. Again, create a new project in the developer console. Described above. But at the step ‘Build under the Actions SDK box’ choose your newly created project. By this, they share the same project_id.

Troubleshooting with NGINX

When using NGINX, ensure that your proxy_pass line does not have a trailing /, as this will result in errors. Your line should look like:

proxy_pass http://localhost:8123;