Audio AnalyzerSAFE
MCP server that gives Claude the ability to hear music. Pure Rust audio analysis — spectral, harmonic, rhythm, timbre — returned as structured data.
Overview
From the repository's own README, as read at the audited commit. Badges and raw HTML are left out.
An MCP server that gives Claude the ability to hear music.
Point Claude at any audio file and it can tell you the key, tempo, dynamics, timbre, percussive character, stereo field, structural sections, and how the music evolves over time -- all from raw audio analysis, no images, no guessing, under 1% context window usage.
Compare two tracks side-by-side. Detect where the music changes structurally — intro, verse, chorus, bridge — and zoom into the moments that matter.
What is this?
LLMs can see (vision) and read (text), but they can't hear. This project bridges that gap by running real audio analysis -- the same DSP techniques used in music information retrieval research -- and returning structured numerical data that Claude can reason about.
It's an MCP server that exposes audio analysis as tools Claude can call on demand. Ask Claude to analyze a song and it will decode the audio, run spectral/harmonic/rhythm/percussive analysis, and return the results as compact text. No spectrograms, no images, no wasted tokens.
Full analysis of a 60-second track completes in under 2 seconds (including source separation). Pure Rust. No Python, no FFmpeg, no system dependencies.
Features
- Audio decoding -- mp3, wav, flac, ogg, aac via Symphonia (pure Rust)
- Spectral analysis -- centroid (brightness), bandwidth (richness), rolloff, flatness (tonality)
- Frequency band energy -- RMS energy across 7 standard producer bands (sub-bass through brilliance) for mix diagnosis
- Spectral contrast -- peak vs valley per band in dB, reveals clarity vs muddiness
- Dynamic range -- crest factor, loudness range (95th-5th percentile), peak dBFS
- LUFS loudness -- EBU R128 integrated loudness (ITU-R BS.1770-4 stereo channel summing), true peak (dBTP), loudness range (LRA), streaming platform targets. Validated to 0.0 dB of FabFilter Pro-L 2.
- Stereo field analysis -- phase correlation (mono c
a13791f9281dOBSERVED · 2026-10-08Trust audit
SAFEgrade B · trust 89/100 Nothing in the source contradicts what it says it does. Grade A is reserved for packages that have also passed the behavioural sandbox.
| Layer | What it checks | Result |
|---|---|---|
| L0 | Provenance & inventory | PASS |
| L1 | Static analysis of the code | PASS |
| L2 | Instruction surface (what it tells the agent) | PASS |
| L3 | Class-specific surface | PASS |
| L4 | Behavioural (sandbox) | SKIPPED |
What the source does
- Filesystem
- none-observed
- Network
- none-observed
- Shell
- none-observed
- Dependencies
- pinned
- Secrets in source
- none-found
Findings (6)
tar czf ../../../audio-analyzer-${{ matrix.target }}.tar.gz cli mcp-servercd ../../..
7z a ../../../audio-analyzer-${{ matrix.target }}.zip cli.exe mcp-server.execd ../../..
[Watch a fresh Claude analyse four tracks in one session](https://claude.ai/share/e40ea498-fe3e-4b22-9a70-81edf6637514) — an original piano/brass composition, Bohemian Rhapsody's full structure mapped
Gates applied: no_behavioural_pass.
a13791f9281dfull audit observations/trust-audit/mcp-server/juzzydee__audio-analyzer.json · Report an issue / request a re-scanAudit history
Every audit this server has had. A grade with a past is a grade somebody is still checking.
| Date | Source | Verdict | Grade | Score | Change |
|---|---|---|---|---|---|
| 2026-10-08 | a13791f9281d | SAFE | B | 89 | first audit |
Questions
What is the Audio Analyzer MCP server?
MCP server that gives Claude the ability to hear music. Pure Rust audio analysis — spectral, harmonic, rhythm, timbre — returned as structured data.
Is Audio Analyzer safe to connect to an agent?
The audit found nothing in the source that contradicts what it says it does, and graded it B (89/100). Grade A is held back for packages that have also passed a sandboxed behavioural run, which is why a clean server reads B.
What credentials does Audio Analyzer need?
No credential environment variables were found in its source, so it appears to need none.
How does Audio Analyzer run?
It speaks stdio, so it runs as a local process your client starts.
How current is this page?
The grade is for one exact copy of the source (a13791f9281d), read on 2026-10-08. The repository is watched and re-audited when it changes.