> ## Documentation Index > Fetch the complete documentation index at: https://docs.vivix.ai/llms.txt > Use this file to discover all available pages before exploring further. # Update Character > **PUT replaces the whole record; it is not PATCH.** The body matches create (including `name`). Keys omitted from the request are deleted from the stored config. The success `data` is the character after the write, so you can check what was stored. Error responses use the same `{code, message, data}` envelope; a non-zero `code` identifies the error. | Case | Error code | | - | - | | The character does not exist, is deleted, or is not in the current workspace | `20005 not found` | | Other validation failures | Same as Create Character. | ## OpenAPI ````yaml streaming-avatar/api-references/openapi.json PUT /v1/characters/{character_id} openapi: 3.1.0 info: title: Vivix Streaming Avatar API version: 1.0.0 description: REST endpoints for Streaming Avatar sessions, voices, and characters. servers: - url: https://api.vivix.ai security: - bearerAuth: [] paths: /v1/characters/{character_id}: put: summary: Update Character description: >- **PUT replaces the whole record; it is not PATCH.** The body matches create (including `name`). Keys omitted from the request are deleted from the stored config. The success `data` is the character after the write, so you can check what was stored. operationId: updateCharacter parameters: - name: character_id in: path required: true schema: type: string description: >- Character id to replace. Body parameters match Create Character. Validation and moderation rules are the same. example: chr_a1b2c3d4e5f6789012345678abcdef01 requestBody: required: true content: application/json: schema: type: object properties: name: type: string description: Display name for lists. model: type: string description: >- Model id. Use `vivix-a1-stream`, or `vivix-a1-stream-lite` for the lighter variant. See [Models](https://platform.vivix.ai/doc/overview/models). region: type: string description: >- Optional deployment region hint. Returned back on the session object; may be empty if not provided. It does not currently affect scheduling or guarantee data residency. session: type: object description: >- Initial mutable session state: mode, active avatar, and the source image used for video. Optional — with a single avatar the defaults below already resolve. Change these values after the session starts with `session.update` on the control channel. properties: mode: type: string description: >- Initial session mode. Supported values are `text_chat` and `video_avatar`. Defaults to `video_avatar`. `text_chat` returns text only, and `video_avatar` returns avatar video with generated speech and text events. active_avatar_id: type: string description: >- Avatar whose instructions are active when the session starts. In `video_avatar` mode, this is also the avatar rendered in the video stream. If omitted and exactly one avatar is provided, that avatar is used; if omitted with multiple avatars, the request fails. source_image_id: type: string description: >- Source image to use for avatar video. Used only when `mode` is `video_avatar`. If omitted in `video_avatar`, uses the active avatar’s `visual.default_source_image_id`. If no default is set and that avatar has exactly one source image, it is selected automatically. In video mode, the request fails if no usable image can be resolved. In `text_chat`, the field is omitted from the REST response. output: type: object description: >- Create-time avatar video output settings. Required for `video_avatar` mode and ignored in `text_chat` mode. See [output](/streaming-avatar/character/spoken-instructions). properties: aspect_ratio: type: string description: >- Requested avatar video aspect ratio, such as `9:16`, `1:1`, or `16:9`. resolution: type: string description: >- Requested avatar video resolution. Supported values are `480p` and `720p`. avatars: type: array description: >- Avatars available in the session. Must not be empty, and `avatar_id` values must not repeat. items: type: object properties: avatar_id: type: string description: >- Caller-defined avatar identifier, unique within the session. instructions: type: string description: >- The avatar’s identity, speaking style, and response rules. These instructions apply only when this avatar is selected by the current `session.active_avatar_id`, and they do not grant tools or data access. voice: type: object description: >- Optional per-avatar TTS configuration for multi-avatar sessions that require different voices. Provide `provider`, `provider_voice_id`, and `model`. For the normal session-wide voice path, omit this object and configure `pipeline_config.tts_config`. A session TTS configuration takes precedence over every per-avatar voice. properties: provider: type: string description: >- TTS backend, such as `qwen-audio-3.0-tts-flash_ws`, `elevenlabs`, or `qwen3tts`. Required with `provider_voice_id` and `model`. provider_voice_id: type: string description: >- Provider-side voice or style id. Required with `provider` and `model`. model: type: string description: >- Provider TTS model id. Required with `provider` and provider_voice_id. speed: type: number description: >- Speech speed multiplier. The valid range is `0.7` to `1.2`. required: - provider - provider_voice_id - model visual: type: object description: >- Visual rendering settings. Required when this avatar is used for video rendering. properties: source_images: type: array description: >- Registered source images available for this avatar. Required when image-based avatar video rendering is used. items: type: object description: >- One source image that can be selected for avatar video rendering. properties: source_image_id: type: string description: >- Caller-defined source image identifier, unique within the avatar. url: type: string description: >- Accessible image URL. Required for a usable video source image and for each source image registered through `avatar.add`. A text-only avatar does not need a video source image. description: type: string description: >- Optional description of the person, pose, and scene. media_type: type: string description: >- Image media type, such as `image/png` or `image/jpeg`. required: - source_image_id - media_type default_source_image_id: type: string description: >- With one usable source image, this field can be omitted. With multiple images and no explicit `source_image_id`, use it to select the initial image. required: - source_images required: - avatar_id - visual pipeline_config: type: object description: >- Session-wide ASR, TTS, LLM, and motion settings. Omit overrides to use platform behavior. Use `tts_config` for the voice and `avatars[].instructions` for identity and response style. `motion_enhanced` and `motion_planner` are optional advanced overrides. These settings are fixed when a session is created. properties: tag_audio_enabled: type: boolean description: >- Optional; defaults to false. Enables faster audio output for an eligible first short speech segment of the response, not emotion tags. Supply a boolean, not a string. See [opening acknowledgements](/streaming-avatar/interaction/acknowledgement). tts_config: type: object properties: tts_voice_id: type: string description: >- Required nonempty `provider` voice ID or Vivix cloned voice_id. tts_provider: type: string description: >- Optional. For built-in Qwen Audio voices, defaults to `qwen-audio-3.0-tts-flash_ws`. A Vivix cloned `voice_id` resolves to its associated speech service. Set the matching value for other services. tts_model_id: type: string description: >- Optional. For built-in Qwen Audio voices, defaults to `qwen-audio-3.0-tts-flash`. A Vivix cloned `voice_id` resolves to its associated model. Set the matching value for other services. tts_endpoint: type: string description: >- Optional endpoint override when nonempty. Not needed for built-in voices. tts_api_key: type: string description: >- Optional `provider` credential when nonempty. Built-in voices need no separate key. payload: type: object description: >- Optional speech-service extensions; arbitrary `provider` parameters are not guaranteed to take effect. Do not duplicate reserved authentication or routing fields here. required: - tts_voice_id description: >- Session-wide TTS configuration. It takes precedence over every `avatars[].voice`. asr_config: type: object properties: provider: type: string description: >- Required when `asr_config` is supplied. Common values are `doubao` and nova-3. The platform supplies a default service when the whole object is omitted, but not when only `language` is provided. language: type: string description: >- Optional. Examples: `zh-CN` or `en-US` for Doubao; en for Nova. Controls recognition `language`, not the reply language. eou_timeout_ms: type: string description: >- Optional end-of-utterance judge timeout, for example "1500". Not a fixed silence length or total response latency. required: - provider description: >- Advanced override. Omit it to use the platform default, `doubao`. Set `provider` (`doubao` for multilingual, or `nova-3` for English-only) and optional `language`. See [`asr_config`](/streaming-avatar/integrate/speech-recognition). llm_config: type: object properties: llm_backend: type: string description: Optional; only `openai` is supported. llm_base_url: type: string description: >- Optional OpenAI-compatible endpoint. Supply with llm_model for a custom service; omit when only tuning generation settings. llm_model: type: string description: Optional custom model name. llm_api_key: type: string description: >- Optional service credential. Keep private credentials out of browser code and public configuration. llm_temperature: type: number description: >- Optional generation temperature; use the range supported by the model. llm_max_output_tokens: type: integer description: Optional generated-token limit, not a word count. llm_extra_payload: type: string description: >- Optional JSON-encoded object string; do not supply a nested object. description: >- `llm_config` · optional object. Set `llm_base_url` and `llm_model` for a custom service, or override only generation parameters. See [Text model configuration](/streaming-avatar/integrate/dialogue-model) for field types and examples. motion_enhanced: type: object description: >- `prompt` drives the motion generated while the avatar is speaking. See [motion_enhanced](/streaming-avatar/character/speaking-motion). properties: prompt: type: string description: >- Motion prompt. See the linked guide for how to write it. motion_planner: type: object description: >- `prompt` drives listening (idle) motion. The key is `motion_planner`, not `idle_motion`. See [motion_planner](/streaming-avatar/character/listening-motion). properties: prompt: type: string description: >- Motion prompt. See the linked guide for how to write it. required: - tts_config conversation: type: object description: >- Session-level conversation defaults: `tools`, `turn_detection`, and `input_audio_transcription`. See [conversation](/streaming-avatar/character/spoken-instructions). properties: instructions: type: string description: >- Default session and task instructions for generated responses. Effective instructions are composed from the selected avatar instructions, these conversation instructions, and any per-response instructions; conflicts are resolved in the order `response.instructions`, `conversation.instructions`, then `avatars[].instructions`. tools: type: array description: Tools available to responses in the session. items: type: object description: >- One tool definition. Only function tools are documented for v1. properties: type: type: string description: Use `function`. name: type: string description: Function name available to the response planner. description: type: string description: >- Human-readable description of when the tool should be used. parameters: type: object description: JSON Schema object describing function arguments. required: - type - name response_defaults: type: object description: Default response-generation settings for later turns. properties: temperature: type: number description: >- Sampling temperature for generated response text. Supported range is `0` to `2`. max_output_tokens: type: integer description: Maximum generated text tokens for a response. turn_detection: type: object description: Default turn handling for realtime user input. properties: type: type: string description: >- `manual` means the client starts responses explicitly. `server_vad` means the server detects turn boundaries from incoming user audio. silence_duration_ms: type: integer description: >- Compatibility field. Do not use it to tune actual end-of-utterance timing. See [Speech recognition configuration](/streaming-avatar/integrate/speech-recognition) for recognition and turn-detection settings. required: - type input_audio_transcription: type: object description: Default transcription settings for user audio input. properties: enabled: type: boolean description: Whether user audio should be transcribed. language: type: string description: >- BCP-47 `language` code, or `auto` for automatic `language` detection. assets: type: object description: >- Session-scoped reusable assets for `response.script`. Asset ids must be unique across `audio`, `speech_text`, and `visual_prompts`. Avatar source images stay under `avatars[].visual.source_images`. On the REST side the visual prompt text field is `prompt`; on the WSS `asset.add` side the same asset uses `text` — the two shapes differ. properties: audio: type: array description: >- Reusable audio files that can be referenced by scripted vocal output. items: type: object description: One reusable audio asset. properties: asset_id: type: string description: Caller-defined audio asset id. url: type: string description: >- HTTPS URL for the audio file. The URL must be directly fetchable by Vivix without custom request headers. mime_type: type: string description: >- Audio MIME type. Supported values are `audio/wav` and `audio/mpeg`. required: - asset_id - url speech_text: type: array description: >- Reusable exact speech text that can be referenced by scripted vocal output. items: type: object description: One reusable speech text asset. properties: asset_id: type: string description: Caller-defined speech text asset id. text: type: string description: >- Exact text to synthesize and stream through output text events when used in `response.script`. required: - asset_id - text visual_prompts: type: array description: >- Reusable visual instructions that can be referenced by scripted visual output. items: type: object description: One reusable visual prompt asset. properties: asset_id: type: string description: Caller-defined visual prompt asset id. prompt: type: string description: >- Instruction for avatar movement, posture, gaze, gesture, or presentation. required: - asset_id - prompt delivery: type: object description: >- Media delivery settings used when `session.mode` is `video_avatar`. If omitted, the media transport defaults to TRTC. It is not used for `text_chat`. properties: media: type: object description: >- Selects how the client sends and receives realtime media. properties: transport: type: string description: >- Media transport requested for the session. Use `trtc` for TRTC or `agora` for Agora. If omitted, it defaults to TRTC. The response returns the corresponding provider-specific join details under `delivery.media.trtc` or `delivery.media.agora`. max_duration_seconds: type: integer description: >- Maximum session duration in seconds. If omitted, the default session length applies. An explicit value must be greater than `3` (minimum 4). auto_close: type: object description: >- Automatic close policy fixed when the session is created. The response returns the effective values after platform defaults are applied. properties: disconnected_timeout_seconds: type: integer description: >- Closes after all control WebSocket connections have been absent for this period, including when none was ever opened. Omission uses the platform setting; read the effective value in the response. Use `0` to disable, or an integer from `10` to `3600` to enable. seconds. `0` disables the rule; nonzero values must be `10`–`3600`. Omission uses the platform setting. interaction_idle_timeout_seconds: type: integer description: >- Closes the session after this duration without a successfully accepted client interaction or detected user speech. Accepted business events and user speech reset the timeout; WSS Ping/Pong and server events do not. Omitted or 0 disables this policy; explicit non-zero values must be 30–3600. An explicit non-zero timeout cannot exceed the effective maximum session duration. seconds. Omitted or `0` disables the rule; nonzero values must be `30`–`3600`. recording_mode: type: string description: '`on` or `off`. Send `off` to disable recording.' required: - name - model - output - avatars example: name: Studio Host v2 model: vivix-a1-stream output: aspect_ratio: '9:16' resolution: 720p pipeline_config: tts_config: tts_provider: qwen-audio-3.0-tts-flash_ws tts_voice_id: longanhuan_v3.6 tts_model_id: qwen-audio-3.0-tts-flash avatars: - avatar_id: host_a instructions: You are Host A, a warm livestream host. visual: default_source_image_id: front source_images: - source_image_id: front url: https://cdn.example.com/avatars/host-a-front.png description: >- A woman facing the camera in a brightly lit studio, front view. media_type: image/png responses: '200': description: Success content: application/json: schema: type: object required: - code - message - data properties: code: type: integer description: '`0` on success; any other value is an error code.' message: type: string description: '`success`, or an English error description.' data: type: object description: >- The saved character: metadata plus the entire stored configuration. Source image URLs may be rewritten during saving. properties: character_id: type: string description: >- Character id, shaped like `chr_…`. Use it to start a session from [Sessions API](/streaming-avatar/api-references/sessions). name: type: string description: Display name. created_at: type: string format: date-time description: UTC, formatted as `YYYY-MM-DDTHH:MM:SSZ`. updated_at: type: string format: date-time description: >- UTC, formatted as `YYYY-MM-DDTHH:MM:SSZ`. **stored config: object** The saved configuration fields are returned alongside metadata under `data`. `name` is stored as metadata; `character_id` and `idempotency_key` are not saved as session configuration. Source image URLs may be rewritten during saving. model: type: string description: >- Model id. Use `vivix-a1-stream`, or `vivix-a1-stream-lite` for the lighter variant. See [Models](https://platform.vivix.ai/doc/overview/models). region: type: string description: >- Optional deployment region hint. Returned back on the session object; may be empty if not provided. It does not currently affect scheduling or guarantee data residency. session: type: object description: >- Initial mutable session state: mode, active avatar, and the source image used for video. Optional — with a single avatar the defaults below already resolve. Change these values after the session starts with `session.update` on the control channel. properties: mode: type: string description: >- Initial session mode. Supported values are `text_chat` and `video_avatar`. Defaults to `video_avatar`. `text_chat` returns text only, and `video_avatar` returns avatar video with generated speech and text events. active_avatar_id: type: string description: >- Avatar whose instructions are active when the session starts. In `video_avatar` mode, this is also the avatar rendered in the video stream. If omitted and exactly one avatar is provided, that avatar is used; if omitted with multiple avatars, the request fails. source_image_id: type: string description: >- Source image to use for avatar video. Used only when `mode` is `video_avatar`. If omitted in `video_avatar`, uses the active avatar’s `visual.default_source_image_id`. If no default is set and that avatar has exactly one source image, it is selected automatically. In video mode, the request fails if no usable image can be resolved. In `text_chat`, the field is omitted from the REST response. output: type: object description: >- Create-time avatar video output settings. Required for `video_avatar` mode and ignored in `text_chat` mode. See [output](/streaming-avatar/character/spoken-instructions). properties: aspect_ratio: type: string description: >- Requested avatar video aspect ratio, such as `9:16`, `1:1`, or `16:9`. resolution: type: string description: >- Requested avatar video resolution. Supported values are `480p` and `720p`. avatars: type: array description: >- Avatars available in the session. Must not be empty, and `avatar_id` values must not repeat. items: type: object properties: avatar_id: type: string description: >- Caller-defined avatar identifier, unique within the session. instructions: type: string description: >- The avatar’s identity, speaking style, and response rules. These instructions apply only when this avatar is selected by the current `session.active_avatar_id`, and they do not grant tools or data access. voice: type: object description: >- Optional per-avatar TTS configuration for multi-avatar sessions that require different voices. Provide `provider`, `provider_voice_id`, and `model`. For the normal session-wide voice path, omit this object and configure `pipeline_config.tts_config`. A session TTS configuration takes precedence over every per-avatar voice. properties: provider: type: string description: >- TTS backend, such as `qwen-audio-3.0-tts-flash_ws`, `elevenlabs`, or `qwen3tts`. Required with `provider_voice_id` and `model`. provider_voice_id: type: string description: >- Provider-side voice or style id. Required with `provider` and `model`. model: type: string description: >- Provider TTS model id. Required with `provider` and provider_voice_id. speed: type: number description: >- Speech speed multiplier. The valid range is `0.7` to `1.2`. required: - provider - provider_voice_id - model visual: type: object description: >- Visual rendering settings. Required when this avatar is used for video rendering. properties: source_images: type: array description: >- Registered source images available for this avatar. Required when image-based avatar video rendering is used. items: type: object description: >- One source image that can be selected for avatar video rendering. properties: source_image_id: type: string description: >- Caller-defined source image identifier, unique within the avatar. url: type: string description: >- Accessible image URL. Required for a usable video source image and for each source image registered through `avatar.add`. A text-only avatar does not need a video source image. description: type: string description: >- Optional description of the person, pose, and scene. media_type: type: string description: >- Image media type, such as `image/png` or `image/jpeg`. required: - source_image_id - media_type default_source_image_id: type: string description: >- With one usable source image, this field can be omitted. With multiple images and no explicit `source_image_id`, use it to select the initial image. required: - source_images required: - avatar_id - visual pipeline_config: type: object description: >- Session-wide ASR, TTS, LLM, and motion settings. Omit overrides to use platform behavior. Use `tts_config` for the voice and `avatars[].instructions` for identity and response style. `motion_enhanced` and `motion_planner` are optional advanced overrides. These settings are fixed when a session is created. properties: tag_audio_enabled: type: boolean description: >- Optional; defaults to false. Enables faster audio output for an eligible first short speech segment of the response, not emotion tags. Supply a boolean, not a string. See [opening acknowledgements](/streaming-avatar/interaction/acknowledgement). tts_config: type: object properties: tts_voice_id: type: string description: >- Required nonempty `provider` voice ID or Vivix cloned voice_id. tts_provider: type: string description: >- Optional. For built-in Qwen Audio voices, defaults to `qwen-audio-3.0-tts-flash_ws`. A Vivix cloned `voice_id` resolves to its associated speech service. Set the matching value for other services. tts_model_id: type: string description: >- Optional. For built-in Qwen Audio voices, defaults to `qwen-audio-3.0-tts-flash`. A Vivix cloned `voice_id` resolves to its associated model. Set the matching value for other services. tts_endpoint: type: string description: >- Optional endpoint override when nonempty. Not needed for built-in voices. tts_api_key: type: string description: >- Optional `provider` credential when nonempty. Built-in voices need no separate key. payload: type: object description: >- Optional speech-service extensions; arbitrary `provider` parameters are not guaranteed to take effect. Do not duplicate reserved authentication or routing fields here. required: - tts_voice_id description: >- Session-wide TTS configuration. It takes precedence over every `avatars[].voice`. asr_config: type: object properties: provider: type: string description: >- Required when `asr_config` is supplied. Common values are `doubao` and nova-3. The platform supplies a default service when the whole object is omitted, but not when only `language` is provided. language: type: string description: >- Optional. Examples: `zh-CN` or `en-US` for Doubao; en for Nova. Controls recognition `language`, not the reply language. eou_timeout_ms: type: string description: >- Optional end-of-utterance judge timeout, for example "1500". Not a fixed silence length or total response latency. required: - provider description: >- Advanced override. Omit it to use the platform default, `doubao`. Set `provider` (`doubao` for multilingual, or `nova-3` for English-only) and optional `language`. See [`asr_config`](/streaming-avatar/integrate/speech-recognition). llm_config: type: object properties: llm_backend: type: string description: Optional; only `openai` is supported. llm_base_url: type: string description: >- Optional OpenAI-compatible endpoint. Supply with llm_model for a custom service; omit when only tuning generation settings. llm_model: type: string description: Optional custom model name. llm_api_key: type: string description: >- Optional service credential. Keep private credentials out of browser code and public configuration. llm_temperature: type: number description: >- Optional generation temperature; use the range supported by the model. llm_max_output_tokens: type: integer description: >- Optional generated-token limit, not a word count. llm_extra_payload: type: string description: >- Optional JSON-encoded object string; do not supply a nested object. description: >- `llm_config` · optional object. Set `llm_base_url` and `llm_model` for a custom service, or override only generation parameters. See [Text model configuration](/streaming-avatar/integrate/dialogue-model) for field types and examples. motion_enhanced: type: object description: >- `prompt` drives the motion generated while the avatar is speaking. See [motion_enhanced](/streaming-avatar/character/speaking-motion). properties: prompt: type: string description: >- Motion prompt. See the linked guide for how to write it. motion_planner: type: object description: >- `prompt` drives listening (idle) motion. The key is `motion_planner`, not `idle_motion`. See [motion_planner](/streaming-avatar/character/listening-motion). properties: prompt: type: string description: >- Motion prompt. See the linked guide for how to write it. required: - tts_config conversation: type: object description: >- Session-level conversation defaults: `tools`, `turn_detection`, and `input_audio_transcription`. See [conversation](/streaming-avatar/character/spoken-instructions). properties: instructions: type: string description: >- Default session and task instructions for generated responses. Effective instructions are composed from the selected avatar instructions, these conversation instructions, and any per-response instructions; conflicts are resolved in the order `response.instructions`, `conversation.instructions`, then `avatars[].instructions`. tools: type: array description: Tools available to responses in the session. items: type: object description: >- One tool definition. Only function tools are documented for v1. properties: type: type: string description: Use `function`. name: type: string description: >- Function name available to the response planner. description: type: string description: >- Human-readable description of when the tool should be used. parameters: type: object description: >- JSON Schema object describing function arguments. required: - type - name response_defaults: type: object description: >- Default response-generation settings for later turns. properties: temperature: type: number description: >- Sampling temperature for generated response text. Supported range is `0` to `2`. max_output_tokens: type: integer description: Maximum generated text tokens for a response. turn_detection: type: object description: Default turn handling for realtime user input. properties: type: type: string description: >- `manual` means the client starts responses explicitly. `server_vad` means the server detects turn boundaries from incoming user audio. silence_duration_ms: type: integer description: >- Compatibility field. Do not use it to tune actual end-of-utterance timing. See [Speech recognition configuration](/streaming-avatar/integrate/speech-recognition) for recognition and turn-detection settings. required: - type input_audio_transcription: type: object description: >- Default transcription settings for user audio input. properties: enabled: type: boolean description: Whether user audio should be transcribed. language: type: string description: >- BCP-47 `language` code, or `auto` for automatic `language` detection. assets: type: object description: >- Session-scoped reusable assets for `response.script`. Asset ids must be unique across `audio`, `speech_text`, and `visual_prompts`. Avatar source images stay under `avatars[].visual.source_images`. On the REST side the visual prompt text field is `prompt`; on the WSS `asset.add` side the same asset uses `text` — the two shapes differ. properties: audio: type: array description: >- Reusable audio files that can be referenced by scripted vocal output. items: type: object description: One reusable audio asset. properties: asset_id: type: string description: Caller-defined audio asset id. url: type: string description: >- HTTPS URL for the audio file. The URL must be directly fetchable by Vivix without custom request headers. mime_type: type: string description: >- Audio MIME type. Supported values are `audio/wav` and `audio/mpeg`. required: - asset_id - url speech_text: type: array description: >- Reusable exact speech text that can be referenced by scripted vocal output. items: type: object description: One reusable speech text asset. properties: asset_id: type: string description: Caller-defined speech text asset id. text: type: string description: >- Exact text to synthesize and stream through output text events when used in `response.script`. required: - asset_id - text visual_prompts: type: array description: >- Reusable visual instructions that can be referenced by scripted visual output. items: type: object description: One reusable visual prompt asset. properties: asset_id: type: string description: Caller-defined visual prompt asset id. prompt: type: string description: >- Instruction for avatar movement, posture, gaze, gesture, or presentation. required: - asset_id - prompt delivery: type: object description: >- Media delivery settings used when `session.mode` is `video_avatar`. If omitted, the media transport defaults to TRTC. It is not used for `text_chat`. properties: media: type: object description: >- Selects how the client sends and receives realtime media. properties: transport: type: string description: >- Media transport requested for the session. Use `trtc` for TRTC or `agora` for Agora. If omitted, it defaults to TRTC. The response returns the corresponding provider-specific join details under `delivery.media.trtc` or `delivery.media.agora`. max_duration_seconds: type: integer description: >- Maximum session duration in seconds. If omitted, the default session length applies. An explicit value must be greater than `3` (minimum 4). auto_close: type: object description: >- Automatic close policy fixed when the session is created. The response returns the effective values after platform defaults are applied. properties: disconnected_timeout_seconds: type: integer description: >- Closes after all control WebSocket connections have been absent for this period, including when none was ever opened. Omission uses the platform setting; read the effective value in the response. Use `0` to disable, or an integer from `10` to `3600` to enable. seconds. `0` disables the rule; nonzero values must be `10`–`3600`. Omission uses the platform setting. interaction_idle_timeout_seconds: type: integer description: >- Closes the session after this duration without a successfully accepted client interaction or detected user speech. Accepted business events and user speech reset the timeout; WSS Ping/Pong and server events do not. Omitted or 0 disables this policy; explicit non-zero values must be 30–3600. An explicit non-zero timeout cannot exceed the effective maximum session duration. seconds. Omitted or `0` disables the rule; nonzero values must be `30`–`3600`. recording_mode: type: string description: '`on` or `off`. Send `off` to disable recording.' required: - character_id - name - created_at - updated_at example: code: 0 message: success data: character_id: chr_a1b2c3d4e5f6789012345678abcdef01 name: Studio Host v2 created_at: '2026-08-19T10:00:00Z' updated_at: '2026-08-19T11:00:00Z' model: vivix-a1-stream output: aspect_ratio: '9:16' resolution: 720p pipeline_config: tts_config: tts_provider: qwen-audio-3.0-tts-flash_ws tts_voice_id: longanhuan_v3.6 tts_model_id: qwen-audio-3.0-tts-flash avatars: - avatar_id: host_a instructions: You are Host A, a warm livestream host. visual: default_source_image_id: front source_images: - source_image_id: front url: https://cdn.example.com/avatars/host-a-front.png description: >- A woman facing the camera in a brightly lit studio, front view. media_type: image/png components: securitySchemes: bearerAuth: type: http scheme: bearer description: Your Vivix API key. Keep it on your server. ````