> ## Documentation Index
> Fetch the complete documentation index at: https://docs.sia.vision/llms.txt
> Use this file to discover all available pages before exploring further.

# Preview a voice option

> character_voice_preview: permissions and generated input/output contracts.

`character_voice_preview` · Gateway release **0.8.3**

Read the provider preview for one current voice selection fingerprint. Returns bounded audio bytes; no paid speech generation. Use the current fingerprint when assigning.

Required scopes: `account:read`, `studio:read`. Read-only.

Availability depends on runtime configuration and the permissions granted to this connection. Use live MCP discovery as the authority.

## Input

```json theme={null}
{
  "type": "object",
  "additionalProperties": false,
  "properties": {
    "storyworldId": {
      "type": "string",
      "pattern": "^[a-fA-F0-9]{24}$",
      "description": "ID of an accessible saved Storyworld returned by discovery. Keep this destination fixed for the operation."
    },
    "characterId": {
      "type": "string",
      "pattern": "^[a-fA-F0-9]{24}$",
      "description": "ID of the exact saved Character to reuse; do not create a new identity for an outfit or accessory."
    },
    "providerVoiceId": {
      "type": "string",
      "minLength": 1,
      "maxLength": 200
    },
    "selectionFingerprint": {
      "type": "string",
      "minLength": 1,
      "maxLength": 128,
      "description": "Use the current voice/reference option fingerprint from the corresponding options tool."
    }
  },
  "required": [
    "storyworldId",
    "characterId",
    "providerVoiceId",
    "selectionFingerprint"
  ]
}
```

## Declared output

This is the declared success schema. Error results and binary media blocks are separate MCP protocol results.

```json theme={null}
{
  "$schema": "https://json-schema.org/draft/2020-12/schema",
  "type": "object",
  "properties": {
    "schemaVersion": {
      "type": "string",
      "const": "1"
    },
    "providerVoiceId": {
      "type": "string"
    },
    "selectionFingerprint": {
      "type": "string"
    }
  },
  "required": [
    "schemaVersion",
    "providerVoiceId",
    "selectionFingerprint"
  ],
  "additionalProperties": {}
}
```

[All tools](https://docs.sia.vision/mcp-reference.md) · [Permissions](https://docs.sia.vision/authentication.md) · [Media and recovery](https://docs.sia.vision/media-and-recovery.md)


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