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<roles>
## Composable Roles

Engines compose feature roles:

| Role | Feature |
|------|---------|
| `Langertha::Role::Chat` | `simple_chat`, `simple_chat_f` |
| `Langertha::Role::Tools` | `chat_with_tools_f` (MCP loop) |
| `Langertha::Role::Streaming` | SSE/NDJSON streaming |
| `Langertha::Role::Embedding` | Vector embeddings |
| `Langertha::Role::Transcription` | Audio-to-text |
| `Langertha::Role::ImageGeneration` | Image generation |
| `Langertha::Role::SystemPrompt` | System prompt management |
| `Langertha::Role::Temperature` | Generation parameters |
| `Langertha::Role::ResponseFormat` | JSON mode / structured output |
| `Langertha::Role::Models` | Model listing |
| `Langertha::Role::Langfuse` | Observability |
| `Langertha::Role::HermesTools` | XML tag tool calling |
| `Langertha::Role::ThinkTag` | Chain-of-thought filtering |