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

# Reference Data MCP Tools

> Use DialNexa reference data MCP tools through the remote MCP server.

DialNexa reference data MCP tools let an MCP-compatible AI client resolve language, voice, model, and transcriber IDs. Each tool page includes its exact server description, input schema, safety level, request shape, and retry guidance.

## Available Reference Data MCP Tools

| Tool                                                                                 | Safety    | What it does                                                                                                                                       |
| ------------------------------------------------------------------------------------ | --------- | -------------------------------------------------------------------------------------------------------------------------------------------------- |
| [`list_llms`](/docs/mcp-tools/reference-data/list-llms)                                   | Read only | Returns the LLM providers/models available to use when configuring an agent (e.g. GPT-4, Claude).                                                  |
| [`get_llm`](/docs/mcp-tools/reference-data/get-llm)                                       | Read only | Returns details for a single LLM by ID (e.g. llm\_abc123).                                                                                         |
| [`list_fallback_llms`](/docs/mcp-tools/reference-data/list-fallback-llms)                 | Read only | Returns the LLMs eligible to be configured as an agent’s fallback model (used if the primary LLM fails).                                           |
| [`list_languages`](/docs/mcp-tools/reference-data/list-languages)                         | Read only | Returns the languages available for agent voices and transcription.                                                                                |
| [`get_language`](/docs/mcp-tools/reference-data/get-language)                             | Read only | Returns details for a single language by ID (e.g. lang\_abc123).                                                                                   |
| [`list_voices`](/docs/mcp-tools/reference-data/list-voices)                               | Read only | Returns available TTS voices for configuring an agent.                                                                                             |
| [`get_voice`](/docs/mcp-tools/reference-data/get-voice)                                   | Read only | Returns details for a single voice by ID (e.g. voice\_abc123).                                                                                     |
| [`get_voice_languages`](/docs/mcp-tools/reference-data/get-voice-languages)               | Read only | Returns the languages a specific voice supports, given its voice ID.                                                                               |
| [`list_transcribers`](/docs/mcp-tools/reference-data/list-transcribers)                   | Read only | Returns the speech-to-text transcriber options available for configuring an agent.                                                                 |
| [`get_transcriber`](/docs/mcp-tools/reference-data/get-transcriber)                       | Read only | Returns details for a single transcriber by ID (e.g. trs\_abc123).                                                                                 |
| [`list_fallback_transcribers`](/docs/mcp-tools/reference-data/list-fallback-transcribers) | Read only | Returns transcribers with is\_fallback=true, use this list to populate the Fallback STT selector when configuring per-agent STT fallback settings. |

## Before you call a tool

Connect with OAuth or a workspace API key and complete MCP initialization first. Use IDs exactly as another DialNexa tool returned them, including prefixes such as `agent_`, `call_`, and `workflow_`.

For operations that change data, verify the target and current state before the call. Billable and destructive tools require extra care because retrying an uncertain result can spend money or repeat an irreversible action.

## Related guides

* [MCP quickstart](/docs/mcp-tools/quickstart)
* [MCP responses and errors](/docs/mcp-tools/errors)
* [MCP connection and authentication](/docs/mcp-tools/overview)