Script Syntax

Scripts are a sequence of actions that Home Assistant will execute. Scripts are available as an entity through the standalone Script component but can also be embedded in automations and Alexa/Amazon Echo configurations.

The script syntax basic structure is a list of key/value maps that contain actions. If a script contains only 1 action, the wrapping list can be omitted.

# Example script integration containing script syntax
      # This is written using the Script Syntax
      - service: light.turn_on
          entity_id: light.ceiling
      - service: notify.notify
          message: 'Turned on the ceiling light!'

Call a Service

The most important one is the action to call a service. This can be done in various ways. For all the different possibilities, have a look at the service calls page.

- alias: Bedroom lights on
  service: light.turn_on
    entity_id: group.bedroom
    brightness: 100

Activate a Scene

Scripts may also use a shortcut syntax for activating scenes instead of calling the scene.turn_on service.

- scene: scene.morning_living_room

Test a Condition

While executing a script you can add a condition to stop further execution. When a condition does not return true, the script will stop executing. There are many different conditions which are documented at the conditions page.

# If paulus is home, continue to execute the script below these lines
- condition: state
  entity_id: device_tracker.paulus
  state: 'home'


Delays are useful for temporarily suspending your script and start it at a later moment. We support different syntaxes for a delay as shown below.

# Waits 1 hour
- delay: '01:00'
# Waits 1 minute, 30 seconds
- delay: '00:01:30'
# Waits 1 minute
- delay:
    # Supports milliseconds, seconds, minutes, hours, days
    minutes: 1
# Waits however many seconds input_number.second_delay is set to
- delay:
    # Supports milliseconds, seconds, minutes, hours, days
    seconds: "{{ states('input_number.second_delay') }}"
# Waits however many minutes input_number.minute_delay is set to
# Valid formats include HH:MM and HH:MM:SS
- delay: "{{ states('input_number.minute_delay') | multiply(60) | timestamp_custom('%H:%M:%S',False) }}"


Wait until some things are complete. We support at the moment wait_template for waiting until a condition is true, see also on Template-Trigger. It is possible to set a timeout after which the script will continue its execution if the condition is not satisfied. Timeout has the same syntax as delay.

# Wait until media player have stop the playing
- wait_template: "{{ is_state('media_player.floor', 'stop') }}"
# Wait for sensor to trigger or 1 minute before continuing to execute.
- wait_template: "{{ is_state('binary_sensor.entrance', 'on') }}"
  timeout: '00:01:00'

When using wait_template within an automation trigger.entity_id is supported for state, numeric_state and template triggers, see also Available-Trigger-Data.

- wait_template: "{{ is_state(trigger.entity_id, 'on') }}"

It is also possible to use dummy variables, e.g., in scripts, when using wait_template.

# Service call, e.g., from an automation.
- service: script.do_something
    dummy: input_boolean.switch

# Inside the script
- wait_template: "{{ is_state(dummy, 'off') }}"

You can also get the script to abort after the timeout by using optional continue_on_timeout

# Wait until a valve is < 10 or abort after 1 minute.
- wait_template: "{{ state_attr('', 'valve')|int < 10 }}"
  timeout: '00:01:00'
  continue_on_timeout: 'false'

Without continue_on_timeout the script will always continue.

Fire an Event

This action allows you to fire an event. Events can be used for many things. It could trigger an automation or indicate to another integration that something is happening. For instance, in the below example it is used to create an entry in the logbook.

    name: Paulus
    message: is waking up
    entity_id: device_tracker.paulus
    domain: light

You can also use event_data_template to fire an event with custom data. This could be used to pass data to another script awaiting an event trigger.

- event: MY_EVENT
    name: myEvent
    customData: "{{ myCustomVariable }}"

Raise and Consume Custom Events

The following automation shows how to raise a custom event called event_light_state_changed with entity_id as the event data. The action part could be inside a script or an automation.

- alias: Fire Event
    - platform: state
      to: 'on'
    - event: event_light_state_changed
        state: 'on'

The following automation shows how to capture the custom event event_light_state_changed, and retrieve corresponding entity_id that was passed as the event data.

- alias: Capture Event
    - platform: event
      event_type: event_light_state_changed
    - service: notify.notify
        message: "kitchen light is turned {{ }}"