Add LiteLLM integration documentation

source/_integrations/litellm.markdown

@@ -0,0 +1,68 @@
+---
+title: LiteLLM
+description: Instructions on how to integrate a LiteLLM proxy as a conversation agent in Home Assistant
+ha_category:
+  - AI
+ha_release: 2026.7
+ha_iot_class: Cloud Polling
+ha_config_flow: true
+ha_codeowners:
+  - '@luismalves'
+ha_domain: litellm
+ha_integration_type: service
+ha_platforms:
+  - conversation
+ha_quality_scale: bronze
+---
+
+The [LiteLLM](https://www.litellm.ai/) {% term integration %} allows you to use a LiteLLM proxy as a conversation agent in Home Assistant.
+
+LiteLLM exposes a single OpenAI-compatible API in front of a wide range of model providers, so you can use almost any model through one endpoint. This is similar to a service like OpenRouter, with the added benefit that you can run LiteLLM yourself if you prefer to keep everything under your own control. This integration lets you point Home Assistant at any LiteLLM proxy, whether it is a hosted instance or one you self-host.
+
+## Prerequisites
+
+Before you add this integration, you need the following:
+
+- **A LiteLLM proxy that Home Assistant can reach.** This is the endpoint the integration connects to. You can use a hosted LiteLLM proxy or [run one yourself](https://docs.litellm.ai/docs/simple_proxy).
+- **At least one model configured on the proxy.** The integration discovers the available models from the proxy during setup and creates a conversation agent for each one.
+- **An API key, if your proxy requires authentication.** This is used to authorize Home Assistant's requests to the proxy. You can leave it empty if your proxy does not require one.
+
+{% include integrations/config_flow.md %}
+
+{% configuration_basic %}
+URL:
+  description: The base URL of your LiteLLM proxy, including the host and port. The integration automatically appends the OpenAI `/v1` path if it is missing.
+API key:
+  description: An optional LiteLLM API key or virtual key. Leave it empty if your proxy does not require authentication.
+{% endconfiguration_basic %}
+
+### Adding a conversation agent
+
+After the integration is set up, add a conversation agent for the model you want to use:
+
+1. Go to {% my integrations title="**Settings** > **Devices & services**" %} and select your LiteLLM entry.
+2. Select **Add conversation agent**.
+3. Fill in the fields:
+
+{% configuration_basic %}
+Model:
+   description: "The model to use for the conversation agent. The list is discovered from your LiteLLM proxy."
+Instructions:
+   description: "Instruct how the LLM should respond. This field supports [templates](/docs/configuration/templating/)."
+Control Home Assistant:
+   description: "Select which tools the agent can use to interact with your devices and entities. Leave empty if you do not want the agent to control Home Assistant."
+{% endconfiguration_basic %}
+
+To change the model, instructions, or tools later, select the conversation agent and choose **Reconfigure conversation agent**.
+
+## Supported functionality
+
+This integration provides a conversation agent for each model you add. You can use it in [Assist](/voice_control/) like any other conversation agent.
+
+When you grant the agent control of Home Assistant, it can call the configured tools to interact with your devices and entities. To choose which devices and entities the agent can access, see [exposing entities to Assist](/voice_control/voice_remote_expose_devices/).
+
+## Removing the integration
+
+This integration follows standard integration removal, no extra steps are required.
+
+{% include integrations/remove_device_service.md %}