Home Assistant REST API
Open-source home automation platform REST API for controlling smart home devices, querying entity states, firing events, and triggering automations across 3000+ integrations (Zigbee, Z-Wave, Matter, Philips Hue, Google Home, etc.).
Score Breakdown
⚙ Agent Friendliness
🔒 Security
Apache 2.0 open-source with strong community security review. Local network only by default (no external exposure without explicit configuration). Long-lived tokens without expiry is a risk — consider rotation. HTTPS configurable.
⚡ Reliability
Best When
An agent controls a self-hosted smart home environment and needs access to 3000+ device integrations through a single, well-documented local REST API.
Avoid When
You need a fully managed smart home platform without self-hosting — use vendor-native APIs instead.
Use Cases
- • Querying and controlling smart home devices (lights, thermostats, locks) programmatically
- • Triggering home automations and scripts via REST API for agent workflows
- • Reading sensor data (temperature, humidity, motion) for environmental monitoring agents
- • Integrating home automation events with external systems via webhooks
- • Building voice/LLM agents that control physical home devices
Not For
- • Commercial building automation without significant customization
- • Users without technical ability to self-host Home Assistant
- • Cloud-only deployments without local hardware (Raspberry Pi or HA dedicated hardware)
Interface
Authentication
Long-lived access tokens from Home Assistant user profile. Local API for direct access to home network. Home Assistant Cloud (Nabu Casa) enables remote access. WebSocket API for real-time state changes.
Pricing
Core platform is free open-source. Nabu Casa subscription optional for remote access and cloud features. Supports community and strong ecosystem. Most popular home automation platform globally.
Agent Metadata
Known Gotchas
- ⚠ Local-only by default — remote access requires Nabu Casa or self-configured VPN/tunnel
- ⚠ Entity IDs are human-defined and can change — agents should query by friendly_name or attributes
- ⚠ Device availability depends on underlying integration health — devices may be unavailable
- ⚠ REST API is synchronous but device commands may be async — state polling confirms execution
Alternatives
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Scores are editorial opinions as of 2026-03-10.