Add LiteLLM integration documentation

source/_integrations/litellm.markdown

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+---
+title: LiteLLM
+description: Instructions on how to integrate LiteLLM as a conversation agent
+ha_category:
+  - AI
+  - Voice
+ha_release: 2026.7
+ha_iot_class: Local 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 self-hosted LiteLLM proxy as a conversation agent in Home Assistant.
+
+LiteLLM exposes an OpenAI-compatible API in front of a wide range of model providers. Because the proxy is self-hosted, this integration lets you point Home Assistant at your own endpoint instead of a hosted service.
+
+{% include integrations/config_flow.md %}
+
+{% configuration_basic %}
+URL:
+  description: The base URL of your LiteLLM proxy, including the host and port (for example `http://homeassistant.local:4000`). 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 %}
+
+## Prerequisites
+
+You need a running [LiteLLM proxy](https://docs.litellm.ai/docs/simple_proxy) that is reachable from your Home Assistant instance, with at least one model configured. The proxy exposes the available models through its `/model/info` (or `/models`) endpoint, which the integration uses to populate the model selection.
+
+## Supported functionality
+
+### Conversation agent
+
+The integration adds a conversation agent for each configured model that can be used in [Assist](/voice_control/). When you grant it control of Home Assistant, the agent can call the configured tools to interact with your devices and entities.
+
+## Removing the integration
+
+This integration follows standard integration removal, no extra steps are required.
+
+{% include integrations/remove_device_service.md %}