Audio MCP server

audio

Audio playback, editing and analysis

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• Any Format — fast wasm codecs, no ffmpeg.
• Non-destructive — virtual edits, infinite undo, instant clone.
• Stream-first — playback/encode during decode, realtime editing.
• Paged — no 2Gb memory limit, open 10Gb+ files.
• Analysis — loudness, spectrum, beats, pitch, chords, key.
• Modular – pluggable ops, tree-shakable.
• CLI — playback, batch processing, scripting, unix pipes, tab completion.
• Cross-platform — browsers, node, deno, bun.

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• Architecture – stream-first design, pages & blocks, non-destructive editing, plan compilation
• Plugins – custom ops, stats, descriptors (process, plan, resolve, call), persistent ctx

Start&nbsp;&nbsp;&nbsp;Recipes&nbsp;&nbsp;&nbsp;API&nbsp;&nbsp;&nbsp;CLI&nbsp;&nbsp;&nbsp;FAQ&nbsp;&nbsp;&nbsp;Plugins&nbsp;&nbsp;&nbsp;Architecture&nbsp;&nbsp;&nbsp;Comparison

Start

Node

npm i audio

import audio from 'audio'
audio('voice.mp3').trim().normalize('podcast').fade(0.3, 0.5).save('clean.mp3')

Browser

<script type="module">
  import audio from 'https://esm.sh/audio'
  audio('./song.mp3').trim().normalize().fade(0.5, 2).clip({ at: 60, duration: 30 }).play()
</script>

CLI

npm i -g audio # or: npx audio …
audio voice.wav trim normalize podcast fade 0.3s -0.5s save clean.mp3

Skill

npx skills add audiojs/audio

MCP

npx add-mcp "npx -y audio --mcp"  # asks which of your agents: Claude Code, Codex, Cursor, Gemini CLI, Kimi Code, Pi, OpenCode, Zed…

Prompt: make ~/Desktop/interview.m4a podcast-ready and tell me the loudness before and after

One agent at a time: claude mcp add audio -- npx -y audio --mcp, qwen mcp add audio npx -y audio --mcp, droid mcp add audio "npx -y audio --mcp".

Editor and agents

npx audio --bridge  # audio bridge on http://127.0.0.1:7777  key K  agents claude, codex, pi, kimi

Connect the editor to it with the key (once: the bridge keeps it), and its chat runs an agent of yours, which measures, looks at, edits and plays the sound open there; each tab keeps its conversations, each with the agent picked under the message. The bridge finds Claude Code, Codex, Pi, Gemini CLI, Qwen Code, Kimi Code, OpenCode, Kilo Code, Cline, Goose, Factory Droid, Cursor, Augment, Kiro and Mistral Vibe on PATH; any other that speaks ACP runs by its command line, --agent "my-agent --acp".

Any MCP agent gets the editor's tools (state, measure, look, edit, select, play, check, …), the running bridge found by itself: npx add-mcp "npx -y audio --mcp --editor".

An agent thinks with the model its own settings name: Pi takes local ones for good from ollama launch pi --config; Claude Code takes any Anthropic-compatible endpoint from the bridge's environment:

ANTHROPIC_BASE_URL=http://localhost:11434 ANTHROPIC_AUTH_TOKEN=ollama ANTHROPIC_API_KEY= ANTHROPIC_MODEL=qwen3-coder npx audio --bridge

Shortened. The full README is on GitHub.