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Vocametrix

vocametrix

by Vocametrix
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@vocametrix/mcp-server

Official Model Context Protocol server for the Vocametrix voice analysis API.

Gives any MCP-compatible AI assistant (Claude Desktop, Cursor, Cline, etc.) direct access to clinical voice metrics, pronunciation assessment, speech transcription, and AI-powered therapy planning.

Quick start

Claude Desktop

Add to ~/Library/Application Support/Claude/claude_desktop_config.json (macOS) or %APPDATA%\Claude\claude_desktop_config.json (Windows):

{
  "mcpServers": {
    "vocametrix": {
      "command": "npx",
      "args": ["-y", "@vocametrix/mcp-server"],
      "env": {
        "VOCAMETRIX_API_KEY": "your-api-key-here"
      }
    }
  }
}

Get an API key at vocametrix.com/registration. Free trial: 5 minutes of analysis.

Related MCP server: elevenlabs-mcp

Tools

Voice quality (acoustic)

Tool

Description

vocametrix_avqi

Acoustic Voice Quality Index (AVQI) — overall dysphonia severity

vocametrix_dsi

Dysphonia Severity Index (DSI)

vocametrix_cpp_cpps

Cepstral Peak Prominence — breathiness, hoarseness

vocametrix_hnr

Harmonics-to-Noise Ratio (multi-band)

vocametrix_jitter_shimmer

Period and amplitude perturbation

vocametrix_vrp

Voice Range Profile

vocametrix_prosody_similarity

Prosody similarity between two utterances

Advanced voice analysis

Tool

Description

vocametrix_spectral

Spectral tilt, slope, and formant energy

vocametrix_formants

Formant frequencies F1–F4

vocametrix_sz_ratio

S/Z phonation ratio

vocametrix_gne

Glottal-to-Noise Excitation

vocametrix_h1h2

H1–H2 harmonic difference

vocametrix_abi

Acoustic Breathiness Index

vocametrix_voice_dynamics

Dynamic range and fundamental frequency statistics

Ingestion utilities

Tool

Description

vocametrix_upload_audio

Upload a WAV file (base64) → returns a stable blobUrl

vocametrix_ingest_url

Ingest a public HTTPS WAV URL → returns a stable blobUrl

Speech and pronunciation

Tool

Description

vocametrix_assess_pronunciation

Phoneme-level pronunciation scoring

vocametrix_assess_pronunciation_pitch

Pronunciation + pitch analysis combined

vocametrix_transcribe

Streaming ASR transcription with progress

vocametrix_tts

Text-to-speech synthesis

vocametrix_tts_timing

TTS with word-level timing data

Audio measures

Tool

Description

vocametrix_sound_level

dB SPL and intensity statistics

vocametrix_egemaps

Extended Geneva Minimalistic Acoustic Parameter Set

vocametrix_phoneme_detection

Phoneme presence/absence detection

vocametrix_classify_stuttering

Dysfluency classification

AI agents

Tool

Description

vocametrix_agent_interpret_metrics

Clinical interpretation of voice metrics

vocametrix_agent_exercises

Personalized voice/speech exercise generation

vocametrix_agent_word_list

Target word list generation for therapy

vocametrix_agent_therapist_chat

Conversational AI speech-language therapist

vocametrix_agent_french_ipa

French text → IPA phonetic transcription

vocametrix_agent_spell

Spelling correction agent

vocametrix_agent_syntax

Syntax checking agent

vocametrix_agent_vocabulary_tutor

Vocabulary tutoring agent

vocametrix_agent_adaptive_exercise

Adaptive exercise generation

Therapy planning

Tool

Description

vocametrix_generate_therapy_plan

Generate an AI therapy plan

vocametrix_get_therapy_status

Poll therapy plan generation status

vocametrix_get_therapy_result

Fetch completed therapy plan

vocametrix_approve_therapy_plan

Approve a therapy plan

Workflow tools

Tool

Description

vocametrix_full_voice_assessment

Parallel AVQI + CPP + HNR + jitter/shimmer + spectral

vocametrix_batch_pronunciation

Assess a folder of WAV files

vocametrix_full_therapy_workflow

Generate → poll → fetch → approval flow

Resources

  • vocametrix://docs/api — API quick reference (auth, rate limits, audio requirements, error codes)

  • vocametrix://thresholds/{metric} — Clinical reference thresholds for avqi, dsi, cpp, hnr, jitter-shimmer, gne

Prompts

  • interpret_voice_assessment — Generate a clinical SLP-style interpretation report from assessment JSON

  • compare_pre_post_therapy — Quantified pre/post therapy narrative with metric-by-metric comparison

  • generate_session_report — SOAP-format progress note from pronunciation assessment data

Audio requirements

  • Format: WAV (16-bit PCM recommended)

  • Sustained vowel tasks: 3+ seconds of /a/ phonation

  • Connected speech tasks: 5–30 seconds of read passage

  • Minimum sampling rate: 16 kHz

How to pass audio to a tool

The audioPath parameter accepts several input types, but which ones are valid depends on how the MCP server is running:

Input

Hosted / remote server

Stdio / local server (npx, Claude Desktop)

https://... blobUrl from vocametrix_upload_audio

✅ recommended

✅

Public https://... URL to a WAV file

✅

✅

Public URL via vocametrix_ingest_url → returned blobUrl

✅ recommended for URL inputs

✅

data:audio/wav;base64,... data URL

✅

✅

Raw base64 string (≥ 512 chars)

✅

✅

Absolute local path (/home/..., C:\...)

❌ rejected

⚠️ requires VOCAMETRIX_MCP_LOCAL_FS=1

For chat clients that attach audio in the conversation (Claude.ai web/mobile, etc.), the LLM cannot pass an absolute path to a hosted server — it must call vocametrix_upload_audio first with the file content base64-encoded, then pass the returned blobUrl as audioPath to any analysis tool. The MCP descriptions guide the LLM toward this workflow automatically.

For stdio/local deployments where the MCP runs on the user's own machine, set VOCAMETRIX_MCP_LOCAL_FS=1 to allow analysis tools to read absolute local paths directly — convenient for batch processing of files already on disk.

Environment variables

Variable

Required

Description

VOCAMETRIX_API_KEY

Yes

Your Vocametrix API key

VOCAMETRIX_MCP_LOCAL_FS

No

Set to 1 to allow analysis tools to read absolute local file paths (stdio/local deployments only). Default off — local paths are rejected with an actionable error so chat clients are pushed toward the vocametrix_upload_audio → blobUrl workflow.

Development

git clone https://github.com/pmarmaroli/vocametrix-mcp.git
cd vocametrix-mcp
npm install
npm run build
npm test            # run unit tests
npm run inspector   # test with MCP Inspector

MCP Registry

Listed in the official MCP Registry under io.github.pmarmaroli/vocametrix-mcp. Available for one-click installation in MCP-compatible clients (Claude Desktop, Cursor, Zed, Windsurf, and more).

Related projects

The Vocametrix ecosystem:

  • 📘 Vocametrix API documentation — full reference for the underlying REST API powering this MCP server.

  • 📐 OpenAPI 3.1 specification — machine-readable schema for all 48 endpoints.

  • 🐍 vocametrix-python — official Python SDK if you want direct API access from Python (pip install vocametrix).

  • 🟦 vocametrix-js — official TypeScript / JavaScript SDK used internally by this MCP server (npm install vocametrix).

License

MIT — see LICENSE

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