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How to control your Home Assistant devices from Hermes with Hermes Official Plugins

Install the Home Assistant plugin so Hermes can read entity states and call services on your home.

Short answer: Run hermes plugins info homeassistant to see what the plugin needs and which reviewed commit it pins; then run hermes plugins install homeassistant; set the Home Assistant settings that the plugin manifest lists, using your own instance details. All steps.

Credentials. The plugin needs access to your Home Assistant instance, and ha_call_service can change real devices in your home.

Who it is forA smart home owner who already runs Home Assistant and wants an agent to answer questions about devices or act on them.

The problemChecking device states and changing them means opening the Home Assistant interface for every small request.

The outcomeHermes lists your entities, reads their states and calls services, and can deliver cron results to your phone.

What you need first

  • Hermes Agent installed (the README gives a curl install script in the hermes-agent repo)
  • The hermes CLI available in your terminal
  • Accounts and credentials for the specific service you connect, such as Home Assistant, Spotify, Langfuse, Snyk or X
  • Each plugin's own requirements, shown by hermes plugins info <name>

Steps

  1. Run hermes plugins info homeassistant to see what the plugin needs and which reviewed commit it pins. (inferred, check the README)
  2. Run hermes plugins install homeassistant.
  3. Set the Home Assistant settings that the plugin manifest lists, using your own instance details.
  4. Ask Hermes to list your entities, then check one state with ha_get_state.
  5. Create a cron job with deliver=homeassistant to send a scheduled report to your phone.

Prompt for your agent

In the repo NousResearch/hermes-official-plugins, install the homeassistant plugin into Hermes, then use ha_list_entities on the Home Assistant instance <instance-name>. Report the entity list and a state from ha_get_state for one entity <entity-id>. Verify that the entity count matches what Home Assistant shows in its own entity list.

Caveat. The README does not name the Home Assistant settings, so check hermes plugins info homeassistant for the exact requirements before you start.

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