Google Assistant

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

Automatic setup via Home Assistant Cloud

With Home Assistant Cloud, you can connect your Home Assistant instance in a few simple clicks to Google Assistant. With Home Assistant Cloud you don’t have to deal with dynamic DNS, SSL certificates or opening ports on your router. Just log in via the user interface and a secure connection with the cloud will be established. Home Assistant Cloud requires a paid subscription after a 30-day free trial.

For Home Assistant Cloud Users, documentation can be found here.

Manual setup

The Google Assistant integration 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.

Migrate to release 0.80 and above

If this is the first time setting up your Google Assistant integration, you can skip this section and continue with the manual setup instructions below.

Since release 0.80, the Authorization Code type of OAuth account linking is supported. To migrate your existing configuration from release 0.79 or below, you need:

  1. Change your Account linking setting in Actions on Google console. Select the Develop tab at the top of the page. Then select Account linking from the left side menu.
    • Change Linking type to OAuth and Authorization Code.
    • In the OAuth Client information section:
      • Change Client ID to, the trailing slash is important.
      • Input any string you like into Client Secret, Home Assistant doesn’t need this field.
      • Change Authorization URL to https://[YOUR HOME ASSISTANT URL:PORT]/auth/authorize (replace with your actual URL).
      • Change Token URL to https://[YOUR HOME ASSISTANT URL:PORT]/auth/token (replace with your actual URL).
    • In the Configure your client section:
      • Do NOT check Google to transmit clientID and secret via HTTP basic auth header.
    • Click Save at the top right corner, then click Test (also at the top right corner) to generate a new draft version of the Test App.
  2. Change your configuration.yaml file:
    • Remove client_id, access_token, agent_user_id config from google_assistant: since they are no longer needed.
  3. Restart Home Assistant, open the Google Home app on your mobile phone then go to Account > Settings > Assistant > Home Control, press the 3 dot icon in the top right > Manage accounts > [test] your app name > Unlink account Then relink your account by selecting [test] your app name again.
  4. A browser will open and ask you to login to your Home Assistant instance and will redirect back to the Google Assistant app right afterward.

If you’ve added Home Assistant to the home screen, you have to first remove it from home screen, otherwise, this HTML5 app will show up instead of a browser. Using it would prevent Home Assistant to redirect back to the Google Assistant app.

If you’re still having trouble, make sure that you’re not connected to the same network Home Assistant is running on, e.g., use 4G/LTE instead.

First time setup

You need to create an API Key with the Google Cloud API Console which allows you to update devices without unlinking and relinking an account (see below). If you don’t provide one, 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 set up 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.

  1. Create a new project in the Actions on Google console.

    1. Add/Import a project and give it a name.
    2. Click on the Smart Home card, select the Smart home recommendation.
    3. Click Build your Action, select Add Action(s). Add your Home Assistant URL: https://[YOUR HOME ASSISTANT URL:PORT]/api/google_assistant in the Fulfillment URL box, replace the [YOUR HOME ASSISTANT URL:PORT] with the domain / IP address and the port under which your Home Assistant is reachable.
    4. Click Save. 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.

    1. Leave it at the default No, I only want to allow account creation on my website and select Next.
    2. For the Linking type select OAuth and Authorization Code. Click Next
    3. Client ID:, the trailing slash is important.
    4. Client Secret: Anything you like, Home Assistant doesn’t need this field.
    5. Authorization URL (replace with your actual URL): https://[YOUR HOME ASSISTANT URL:PORT]/auth/authorize.
    6. Token URL (replace with your actual URL): https://[YOUR HOME ASSISTANT URL:PORT]/auth/token. Click Next
    7. Configure your client: Type email and click Add scope, then type name and click Add scope again.
    8. Do NOT check Google to transmit clientID and secret via HTTP basic auth header. Click Next
    9. Testing instructions: Enter anything. It doesn’t matter since you won’t submit this app. Click Save
    Screenshot: Account linking
  3. Select the Develop tab at the top of the page, then in the upper right hand corner select the Test button to generate the draft version Test App.

  4. Add the google_assistant integration configuration to your configuration.yaml file and restart Home Assistant following the configuration guide below.

  5. Open the Google Home app and goto Account most right icon.

  6. Click + Set up or add, + Set up device, ‘New devices’, choose your home and click Next click Have should have [test] your app name listed under ‘Add new.’ Selecting that should lead you to a browser to login your Home Assistant instance, then redirect back to a screen where you can set rooms for your devices or nicknames for your devices.

If you’ve added Home Assistant to the home screen, you have to first remove it from home screen, otherwise, this HTML5 app will show up instead of a browser. Using it would prevent Home Assistant to redirect back to the Google Assistant app.

  1. If you want to allow other household users to control the devices:
    1. Go to the settings for the project you created in the Actions on Google console.
    2. Click Test -> Simulator, then click Share icon in the right top corner. Follow the on-screen instruction:
      1. Add team members: Got to Settings -> Permission, click Add, type the new user’s e-mail address and choose Project -> Viewer role.
      2. Copy and share the link with the new user.
      3. When the new user opens the link with their own Google account, it will enable your draft test app under their account.
    3. Have the new user go to their Google Assistant app to add [test] your app name to their account.
  2. 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:
    1. Go to the Google API Console.
    2. Select your project and click Enable Homegraph API.
    3. Go to Credentials, which you can find on the left navigation bar under the key icon, and select API Key from Create Credentials.
    4. Note down the generated API Key and use this in the configuration.


Now add the following lines to your configuration.yaml file:

# Example configuration.yaml entry
  project_id: YOUR_PROJECT_ID
  api_key: YOUR_API_KEY
    - switch
    - light
        - ENTRY_LIGHTS
      expose: false
      room: LIVING_ROOM
      expose: false

Configuration Variables



Project ID from the Actions on Google console (looks like words-2ab12)



Pin code to say when you want to interact with a secure device.



Your Homegraph API key (for the google_assistant.request_sync service)



Expose devices in all supported domains by default. If exposed_domains domains is set, only these domains are exposed by default. If expose_by_default is set to false, devices have to be manually exposed in entity_config.

Default value:




List of entity domains to expose to Google Assistant if expose_by_default is set to true. This has no effect if expose_by_default is set to false.



Entity specific configuration for Google Assistant



Entity to configure



Name of the entity to show in Google Assistant



Force an entity to be exposed/excluded.

Default value:




Aliases that can also be used to refer to this entity



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:

  • camera (streaming, requires compatible camera)
  • group (on/off)
  • input_boolean (on/off)
  • scene (on)
  • script (on)
  • switch (on/off)
  • fan (on/off/speed)
  • light (on/off/brightness/rgb color/color temp)
  • lock (lock/unlock (to allow assistant to unlock, set the allow_unlock key in configuration))
  • cover (on/off/set position)
  • media_player (on/off/set volume (via set volume)/source (via set input source))
  • climate (temperature setting, hvac_mode)
  • vacuum (dock/start/stop/pause)
  • sensor (temperature setting, only for temperature sensor)
  • Alarm Control Panel (Arm/Disarm)
The domain groups contains groups containing all items, by example group.all_automations. When telling Google Assistant to shut down everything, this will lead in this example to disabling all automations

Secure Devices

Certain devices are considered secure, including anything in the lock domain, alarm_control_panel domain and covers with device types garage and door.

By default these cannot be opened by Google Assistant unless a secure_devices_pin is set up. To allow opening, set the secure_devices_pin to something and you will be prompted to speak the pin when opening the device. Closing and locking these devices does not require a pin.

For the Alarm Control Panel if a code is set it must be the same as the secure_devices_pin. If code_arm_required is set to false the system will arm without prompting for the pin.

Media Player Sources

Media Player sources are sent via the Modes trait in Google Assistant. There is currently a limitation with this feature that requires a hard-coded set of settings. Because of this, the only sources that will be usable by this feature are listed here.

Example Command:

“Hey Google, change input source to TV on Living Room Receiver”

Room/Area support

Entities that have not got rooms explicitly set and that have been placed in Home Assistant areas will return room hints to Google with the devices in those areas.

Climate Operation Modes

There is not an exact 1-1 match between Home Assistant and Google Assistant for the available operation modes. Here are the modes that are currently available:

  • off
  • heat
  • cool
  • heatcool (auto)
  • fan-only
  • dry
  • eco

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 Actions on Google console. Resolve this by:

  1. Removing your project from the Actions on Google console.
  2. Add a new project to the Google Cloud API 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 Actions on Google 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.

Syncing may also fail after a period of time, likely around 30 days, due to the fact that your Actions on Google app is technically in testing mode and has never been published. Eventually, it seems that the test expires. Control of devices will continue to work but syncing may not. If you say “Ok Google, sync my devices” and get the response “Unable to sync Home Assistant”, this can usually be resolved by going back to your test app in the Actions on Google console and clicking Simulator under TEST. Regenerate the draft version Test App and try asking Google to sync your devices again. If regenerating the draft does not work, go back to the Action section and just hit the enter key for the URL to recreate the Preview.

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;

Unlink and relink

If you’re having trouble with Account linking failed after you unlinked your service, try clearing the browser history and cache.