# Zeltor Music Tools (remote · zeltorlabs.com)

Check if two songs mix (Camelot key, BPM), read shared song DNA reports, tempo and nightcore math.

- Trust score: 75/100 (medium)
- Registry status: active
- Liveness: live
- Owner verified: no
- Last scored: 2026-11-05

## Components

- remote · `zeltorlabs.com`: 75/100 (this document), [markdown](https://verifymcp.io/servers/com-zeltorlabs-music-tools/zeltorlabs.md), [page](https://verifymcp.io/servers/com-zeltorlabs-music-tools/zeltorlabs)

## Channel facts

- Endpoint: `https://zeltorlabs.com/mcp`
- Transports: `streamable-http`
- Auth: `none`
- Version: `1.1.0`

## Trust breakdown

How this component scores in each security and reliability category. Every signal is checked automatically against the live server, and we only credit what we can confirm. Scores are 0–100 per category. Scoring method: https://verifymcp.io/docs/scoring (what has changed: https://verifymcp.io/docs/scoring/changelog)

Scored 2026-11-05.

- **Endpoint Security**: 80/100
  - The endpoint's TLS certificate is valid, in date, and uses a strong key.
  - No authorisation is required to call this server. Every tool declares its destructiveHint and none is destructive, so open access doesn't expose one.
  - HTTPS is enforced; there's no plaintext access path.
  - The HSTS (Strict-Transport-Security) header is present.
  - DNSSEC check failed: this domain isn't protected by DNSSEC.
- **Transport & Reachability**: 100/100
  - Verified streamable-http transport via a live MCP handshake.
- **Schema Quality & AI Usability**: 70/100
  - AI-judged instruction clarity (excellent).
  - Context-footprint check failed: tool/resource definitions use about 952 tokens (~158/item across 6 items; 6 tools + 0 resources), over budget; trim descriptions and params.
  - Usage-examples check failed: none of the tools include examples.
- **Stability & Change Management**: 17/100
  - Stability observed for 5 of 30 days with no destabilising changes; credit accrues until the full window elapses.
- **Tool Coverage**: 100/100
  - 100% of tools have a non-trivial description (not blank, and not just the tool's name).
  - 100% of tool parameters carry a description.
- **Tool Safety**: 100/100
  - No prompt-injection markers were found in the server instructions, tool names or descriptions we captured.
  - We read all 6 captured tool definition(s), and no name or description among them implies an irreversible operation.
  - An AI judge read all 7 captured unit(s) of tool text and found none that tries to manipulate the model reading it.
- **Capabilities**: 100/100
  - Implements a supported MCP spec version (2025-11-25); the latest is 2026-07-28.

## Install

### How do I install the Zeltor Music Tools MCP server?

Zeltor Music Tools is a hosted endpoint at https://zeltorlabs.com/mcp, so there is nothing to install locally. Ready-made configuration for Claude, Cursor, VS Code, Codex and 5 more is on this page, copied from each client's own documentation.

### Claude

```bash
claude mcp add --transport http com-zeltorlabs-music-tools 'https://zeltorlabs.com/mcp'
```

### Cursor

```json
{
  "mcpServers": {
    "com-zeltorlabs-music-tools": {
      "url": "https://zeltorlabs.com/mcp"
    }
  }
}
```

### VS Code

```json
{
  "servers": {
    "com-zeltorlabs-music-tools": {
      "type": "http",
      "url": "https://zeltorlabs.com/mcp"
    }
  }
}
```

### Codex

```toml
[mcp_servers.com-zeltorlabs-music-tools]
url = "https://zeltorlabs.com/mcp"
```

### opencode

```json
{
  "$schema": "https://opencode.ai/config.json",
  "mcp": {
    "com-zeltorlabs-music-tools": {
      "type": "remote",
      "url": "https://zeltorlabs.com/mcp",
      "enabled": true
    }
  }
}
```

### OpenClaw

```bash
openclaw mcp add com-zeltorlabs-music-tools --url 'https://zeltorlabs.com/mcp' --transport streamable-http
```

### Hermes

```yaml
mcp_servers:
  com-zeltorlabs-music-tools:
    url: "https://zeltorlabs.com/mcp"
```

### Netclaw

```json
{
  "McpServers": {
    "com-zeltorlabs-music-tools": {
      "Transport": "http",
      "Url": "https://zeltorlabs.com/mcp"
    }
  }
}
```

### Vellum

```bash
assistant mcp add com-zeltorlabs-music-tools -t streamable-http -u 'https://zeltorlabs.com/mcp'
```

### Other

```json
{
  "mcpServers": {
    "com-zeltorlabs-music-tools": {
      "type": "http",
      "url": "https://zeltorlabs.com/mcp"
    }
  }
}
```

The mcpServers block is a cross-client convention. Remote transports vary, so check your client's docs.

## Changelog

Every change recorded for this component, newest first. Days that predate change tracking, or that we cannot explain, say so: "we were watching and nothing happened" and "we were not watching" are different claims.

### 2026-11-05 (score 75, +1)

No change was recorded against any check on this day. Stability & Change Management went from 13 to 17. That category is still filling its 30-day observation window: 4 days of observed history at the previous scan, 5 at this one. The score rises as the window fills, whether or not the server changes.

### 2026-11-02 (score 74, +1)

No change was recorded against any check on this day. Stability & Change Management went from 3 to 7. That category is still filling its 30-day observation window: 1 days of observed history at the previous scan, 2 at this one. The score rises as the window fills, whether or not the server changes.

### 2026-11-01 (score 73, 0)

- [functional improvement] Stability: unverified → 0.03

### 2026-10-31 (score 73)

First indexed and scored.

## MCP tools (6)

### `check_mix` (~218 tokens)

Check if two songs mix

Decides whether two songs will mix well, from their keys and BPMs, using the Camelot wheel and DJ tempo limits (about 3% sounds natural, up to about 16% is usable, half and double time count). Returns a verdict, the tempo change in percent and the target BPM for track B, the smallest key shift in semitones if the keys clash, and a link to make the matched audio.

Input parameters:

- `bpm_a` (number, required): Track A tempo in BPM.
- `bpm_b` (number, required): Track B tempo in BPM.
- `key_a` (string, required): Track A key. Musical key: a name like "A minor", "Am", "F#m", "Bb major", "C", or a Camelot code like "8A".
- `key_b` (string, required): Track B key (the one that would be changed). Musical key: a name like "A minor", "Am", "F#m", "Bb major", "C", or a Camelot code like "8A".

### `camelot` (~85 tokens)

Camelot code and compatible keys

Gives the Camelot wheel code for a key and the three other keys that mix cleanly with it (one step either way with the same letter, and the relative major or minor).

Input parameters:

- `key` (string, required): Musical key: a name like "A minor", "Am", "F#m", "Bb major", "C", or a Camelot code like "8A".

### `tempo_change` (~74 tokens)

Tempo change between two BPMs

Percent change and playback rate to go from one BPM to another, how noticeable it will sound, the pitch change if it is not time-stretched, and the half and double time of the target.

Input parameters:

- `from_bpm` (number, required): Current tempo in BPM.
- `to_bpm` (number, required): Target tempo in BPM.

### `speed_pitch` (~127 tokens)

Nightcore or slowed settings

For a nightcore (faster and higher) or slowed (slower and lower) version: the pitch change in semitones for a speed, the new BPM if given, and typical settings. Defaults: nightcore 1.25x, slowed 0.80x.

Input parameters:

- `bpm` (number): Original tempo, to report the new BPM.
- `speed` (number): Playback speed, e.g. 1.25 for 25% faster or 0.8 for 20% slower.
- `style` (string): Which effect; sets the default speed.

### `transpose` (~97 tokens)

Transpose a key

Moves a key up or down by semitones and gives the new key name and Camelot code, with a note on how natural the shift will sound.

Input parameters:

- `key` (string, required): Musical key: a name like "A minor", "Am", "F#m", "Bb major", "C", or a Camelot code like "8A".
- `semitones` (integer, required): Semitones to move, negative is down.

### `song_report` (~170 tokens)

Read a shared Zeltor song report (song DNA)

Reads the song DNA from a MusicMind report the person made on zeltorlabs.com and shared: key and Camelot code with the keys that mix with it, BPM, genre mix, section structure with energy, and production DNA (energy profile, mood, arrangement density, compression, biggest moments). Takes the share link (https://zeltorlabs.com/report/r/<code>) or its code. Use the key and BPM with check_mix to compare it with another song. If the person has no report yet, they can make one free at https://zeltorlabs.com/analyze (the audio is analyzed in their browser).

Input parameters:

- `link` (string, required): The report share link, e.g. https://zeltorlabs.com/report/r/abc123def456, or its code.

## Diagnostics

Captured diagnostic sections: TLS, DNSSEC, Authorisation, Transports. The full working is on the page: https://verifymcp.io/servers/com-zeltorlabs-music-tools/zeltorlabs#diagnostics

## Score history

- 2026-11-05: 75
- 2026-11-04: 74
- 2026-11-03: 74
- 2026-11-02: 74
- 2026-11-01: 73
- 2026-10-31: 73

## Common questions

### What is the Zeltor Music Tools MCP server?

Zeltor Music Tools is an MCP server listed in the public MCP registry as com.zeltorlabs/music-tools. Check if two songs mix (Camelot key, BPM), read shared song DNA reports, tempo and nightcore math. This page covers its hosted endpoint (https://zeltorlabs.com/mcp).

### Is the Zeltor Music Tools MCP server safe to use?

Zeltor Music Tools scores 75 out of 100 on VerifyMCP. That is a record of what we were able to check automatically, not an endorsement. The category breakdown on this page shows every signal behind the number, including the ones we could not confirm.

### What tools does the Zeltor Music Tools MCP server expose?

Zeltor Music Tools exposes 6 tools: check_mix, camelot, tempo_change, speed_pitch, transpose, song_report. Their descriptions and schemas cost roughly 771 tokens of context every time the server is loaded.

### Does the Zeltor Music Tools MCP server require authentication?

No. We connected to Zeltor Music Tools without credentials and it answered, so anything it exposes is reachable by anyone who knows the address.

### Is the Zeltor Music Tools MCP server still maintained?

Zeltor Music Tools is still listed as active in the MCP registry. We last reached this channel on 5 November 2026. Those dates come from our own scans of the registry and the channel itself, not from anything the publisher announced.

## Links

- Remote endpoint: https://zeltorlabs.com/mcp
- Website: https://zeltorlabs.com/
- Changelog RSS feed: https://verifymcp.io/servers/com-zeltorlabs-music-tools/zeltorlabs.xml
- Changelog JSON feed: https://verifymcp.io/servers/com-zeltorlabs-music-tools/zeltorlabs.json
- HTML version of this page: https://verifymcp.io/servers/com-zeltorlabs-music-tools/zeltorlabs