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name: home-assistant description: Guidance for Home Assistant configurations. Use when writing automations, dashboards, or service calls for HA.

Home Assistant Skill

Fetch official docs for current syntax - HA evolves rapidly:

• https://www.home-assistant.io/docs/automation/ - Automation syntax
• https://www.home-assistant.io/integrations/ - All integrations
• https://www.home-assistant.io/dashboards/ - Dashboard config

Quality Checklist

• Use modern service syntax: target: + data:, not entity_id: at root
• Automations have unique id and explicit mode
• Secrets via !secret, never hardcoded
• Templates tested in Developer Tools → Template
• Check entity availability for unreliable devices

Common Pitfalls

Legacy Syntax

Claude may generate deprecated patterns. Use modern syntax:

Copy# Wrong: deprecated
service: homeassistant.turn_on
entity_id: light.porch

# Right: modern
service: light.turn_on
target:
  entity_id: light.porch

Automations need id and mode:

Copyautomation:
  - id: porch_light_sunset
    alias: "Porch light at sunset"
    mode: single  # or restart, queued, parallel
    trigger:
      - platform: sun
        event: sunset
    action:
      - service: light.turn_on
        target:
          entity_id: light.porch

Missing Availability Checks

Unreliable devices need guards:

Copyaction:
  - choose:
      - conditions:
          - condition: template
            value_template: >
              {{ states('light.unreliable_bulb') not in ['unavailable', 'unknown'] }}
        sequence:
          - service: light.turn_on
            target:
              entity_id: light.unreliable_bulb

Trigger Spam

State triggers fire on every change. Use thresholds or debounce:

Copy# Threshold: only fires when crossing
trigger:
  - platform: numeric_state
    entity_id: sensor.temperature
    above: 75

# Debounce: must stay in state
trigger:
  - platform: state
    entity_id: sensor.temperature
    for:
      minutes: 5

Hardcoded Values

Use templates for dynamic content:

Copy# Bad
message: "Front door opened"

# Good
message: "Front door opened at {{ now().strftime('%I:%M %p') }}"