Koskamo

Zeltor Music Tools MCP

An MCP server providing read-only access to Zeltor Labs' music theory and analysis tools. It allows AI agents to check if two songs mix based on Camelot keys and BPM, calculate tempo changes, determine nightcore or slowed settings, transpose keys, and retrieve song DNA reports from shared links. This enables agents to answer music theory questions and provide direct links for audio processing without handling audio files directly.

Endpoint and access

No sign-in to connect and list tools. Individual tools may still need a vendor account, credentials, or permissions; check the documented prerequisites.

Zeltor Music Tools MCP logo, by Zeltor LabsVendor evidenceStreamable HTTPNo sign-inEndpoint checked 2026-11-01Operated by Zeltor Labs
MCP endpoint (Streamable HTTP)
https://zeltorlabs.com/mcp
Vendor documentation

What you can do with it

  • Check if two songs mix based on key and BPM
  • Calculate tempo change or nightcore speed settings
  • Retrieve song DNA reports from shared links
  • Transpose musical keys

Source and maintenance

Vendor evidenceRegistry 1.1.0
mcp-registry: com.zeltorlabs/music-tools@1.1.0Project website

Protocol and capabilities

Server
zeltor-music-tools 1.1.0
MCP protocol
2025-06-18
Tools
6 advertised
Resources
Not advertised
Resource templates
Not advertised
Prompts
Not advertised
Server-advertised capabilities
{
  "tools": {
    "listChanged": true
  }
}

Server-provided instructions

Untrusted server output shown for inspection. It is not Koskamo guidance and is excluded from knowledge search.

Zeltor Labs music tools for DJs, producers and mashup makers. Use them instead of working out music theory by hand: check_mix decides whether two songs mix (key and tempo) and exactly how to change the second one; camelot gives a key's Camelot code and the keys that mix with it; tempo_change gives the percent change between two BPMs; speed_pitch gives nightcore or slowed settings; transpose moves a key by semitones; song_report reads the song DNA (key, BPM, structure, mood, production) from a Zeltor report link the person shares. They take keys and BPMs, not audio. Each answer has a link to the zeltorlabs.com page where the person can make the actual audio file in their browser (free 60-second preview, full length $4). Share that link when the person wants the file.

Tools

6 advertised

check_mix — Check if two songs mix
Advertised by the server during the last successful anonymous check.
Advertised read-only

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.

check_mix input schema
{
  "type": "object",
  "$schema": "http://json-schema.org/draft-07/schema#",
  "required": [
    "key_a",
    "bpm_a",
    "key_b",
    "bpm_b"
  ],
  "properties": {
    "bpm_a": {
      "type": "number",
      "maximum": 400,
      "minimum": 20,
      "description": "Track A tempo in BPM."
    },
    "bpm_b": {
      "type": "number",
      "maximum": 400,
      "minimum": 20,
      "description": "Track B tempo in BPM."
    },
    "key_a": {
      "type": "string",
      "description": "Track A key. Musical key: a name like \"A minor\", \"Am\", \"F#m\", \"Bb major\", \"C\", or a Camelot code like \"8A\"."
    },
    "key_b": {
      "type": "string",
      "description": "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\"."
    }
  }
}
check_mix annotations
{
  "readOnlyHint": true,
  "openWorldHint": false,
  "idempotentHint": true,
  "destructiveHint": false
}
camelot — Camelot code and compatible keys
Advertised by the server during the last successful anonymous check.
Advertised read-only

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).

camelot input schema
{
  "type": "object",
  "$schema": "http://json-schema.org/draft-07/schema#",
  "required": [
    "key"
  ],
  "properties": {
    "key": {
      "type": "string",
      "description": "Musical key: a name like \"A minor\", \"Am\", \"F#m\", \"Bb major\", \"C\", or a Camelot code like \"8A\"."
    }
  }
}
camelot annotations
{
  "readOnlyHint": true,
  "openWorldHint": false,
  "idempotentHint": true,
  "destructiveHint": false
}
tempo_change — Tempo change between two BPMs
Advertised by the server during the last successful anonymous check.
Advertised read-only

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.

tempo_change input schema
{
  "type": "object",
  "$schema": "http://json-schema.org/draft-07/schema#",
  "required": [
    "from_bpm",
    "to_bpm"
  ],
  "properties": {
    "to_bpm": {
      "type": "number",
      "maximum": 400,
      "minimum": 20,
      "description": "Target tempo in BPM."
    },
    "from_bpm": {
      "type": "number",
      "maximum": 400,
      "minimum": 20,
      "description": "Current tempo in BPM."
    }
  }
}
tempo_change annotations
{
  "readOnlyHint": true,
  "openWorldHint": false,
  "idempotentHint": true,
  "destructiveHint": false
}
speed_pitch — Nightcore or slowed settings
Advertised by the server during the last successful anonymous check.
Advertised read-only

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.

speed_pitch input schema
{
  "type": "object",
  "$schema": "http://json-schema.org/draft-07/schema#",
  "properties": {
    "bpm": {
      "type": "number",
      "maximum": 400,
      "minimum": 20,
      "description": "Original tempo, to report the new BPM."
    },
    "speed": {
      "type": "number",
      "maximum": 2,
      "minimum": 0.5,
      "description": "Playback speed, e.g. 1.25 for 25% faster or 0.8 for 20% slower."
    },
    "style": {
      "enum": [
        "nightcore",
        "slowed"
      ],
      "type": "string",
      "description": "Which effect; sets the default speed."
    }
  }
}
speed_pitch annotations
{
  "readOnlyHint": true,
  "openWorldHint": false,
  "idempotentHint": true,
  "destructiveHint": false
}
transpose — Transpose a key
Advertised by the server during the last successful anonymous check.
Advertised read-only

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.

transpose input schema
{
  "type": "object",
  "$schema": "http://json-schema.org/draft-07/schema#",
  "required": [
    "key",
    "semitones"
  ],
  "properties": {
    "key": {
      "type": "string",
      "description": "Musical key: a name like \"A minor\", \"Am\", \"F#m\", \"Bb major\", \"C\", or a Camelot code like \"8A\"."
    },
    "semitones": {
      "type": "integer",
      "maximum": 12,
      "minimum": -12,
      "description": "Semitones to move, negative is down."
    }
  }
}
transpose annotations
{
  "readOnlyHint": true,
  "openWorldHint": false,
  "idempotentHint": true,
  "destructiveHint": false
}
song_report — Read a shared Zeltor song report (song DNA)
Advertised by the server during the last successful anonymous check.
Advertised read-only

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).

song_report input schema
{
  "type": "object",
  "$schema": "http://json-schema.org/draft-07/schema#",
  "required": [
    "link"
  ],
  "properties": {
    "link": {
      "type": "string",
      "description": "The report share link, e.g. https://zeltorlabs.com/report/r/abc123def456, or its code."
    }
  }
}
song_report annotations
{
  "readOnlyHint": true,
  "openWorldHint": false,
  "idempotentHint": true,
  "destructiveHint": false
}

Prompts

Not advertised

No prompt definitions available.

Resources

Not advertised

No resource definitions available.

30-day availability

Aggregated from read-only remote checks; this is not a tool-execution or security guarantee.

Successful checks
1 of 1 (100%)
Average latency
451 ms
95th percentile latency
451 ms

Maintenance history

Public check and source-refresh events. Editorial and ownership records remain private.

  • · probe · passed · 451 ms · metadata changed · 6 tool(s)

Connect from your client

Each snippet registers the same endpoint; pick the client you use.

This server is operated by the named third party. Listing and endpoint checks are not an endorsement or a security audit. Review the operator's permissions, terms, and data handling before connecting. How listings are checked and corrected.

Claude Code

Run this once in a terminal. It registers the remote server. Use --scope project to write .mcp.json for the repo.
Claude Code configuration
claude mcp add --transport http zeltor-music-tools-mcp https://zeltorlabs.com/mcp

Codex

Run this once. Codex stores MCP servers in ~/.codex/config.toml (or .codex/config.toml in a trusted project).
Codex configuration
codex mcp add zeltor-music-tools-mcp --url https://zeltorlabs.com/mcp

Cursor

Merge this server into .cursor/mcp.json in your project, then enable zeltor-music-tools-mcp in your MCP settings.
Cursor configuration
{
  "mcpServers": {
    "zeltor-music-tools-mcp": {
      "url": "https://zeltorlabs.com/mcp"
    }
  }
}

Cline

Merge this into cline_mcp_settings.json (Cline → MCP Servers → Configure).
Cline configuration
{
  "mcpServers": {
    "zeltor-music-tools-mcp": {
      "type": "streamableHttp",
      "url": "https://zeltorlabs.com/mcp",
      "disabled": false
    }
  }
}

VS Code

Merge this server into .vscode/mcp.json. Use MCP: List Servers to start zeltor-music-tools-mcp and inspect its tools.
VS Code configuration
{
  "servers": {
    "zeltor-music-tools-mcp": {
      "type": "http",
      "url": "https://zeltorlabs.com/mcp"
    }
  }
}

Gemini CLI

Run this once. It writes .gemini/settings.json in the current project; pass --scope user for ~/.gemini/settings.json.
Gemini CLI configuration
gemini mcp add --transport http zeltor-music-tools-mcp https://zeltorlabs.com/mcp

Claude Desktop

Merge this into claude_desktop_config.json (macOS: ~/Library/Application Support/Claude/, Windows: %APPDATA%\Claude\), then restart Claude Desktop.
Claude Desktop configuration
{
  "mcpServers": {
    "zeltor-music-tools-mcp": {
      "url": "https://zeltorlabs.com/mcp"
    }
  }
}

Windsurf

Merge this into ~/.codeium/windsurf/mcp_config.json, then refresh MCP in Cascade. Windsurf remote servers use serverUrl, not url.
Windsurf configuration
{
  "mcpServers": {
    "zeltor-music-tools-mcp": {
      "serverUrl": "https://zeltorlabs.com/mcp"
    }
  }
}

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