HornLib — Interactive French Horn F/Bb Double Horn Fingering & Harmonics Engine

Down since Nov 9 Security A

com.hornlib/mcpv1.0.3 Domain verified

Look up French Horn F/Bb double horn valve fingerings, trigger combinations & partials.

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{
  "_meta": {
    "io.modelcontextprotocol.registry/official": {
      "status": "active",
      "isLatest": true,
      "updatedAt": "2026-11-08T06:08:37.351295Z",
      "publishedAt": "2026-11-08T06:08:37.351295Z",
      "statusChangedAt": "2026-11-08T06:08:37.351295Z"
    }
  },
  "server": {
    "name": "com.hornlib/mcp",
    "icons": [
      {
        "src": "https://hornlib.com/icon.svg",
        "sizes": [
          "any"
        ],
        "mimeType": "image/svg+xml"
      }
    ],
    "title": "HornLib — Interactive French Horn F/Bb Double Horn Fingering & Harmonics Engine",
    "$schema": "https://static.modelcontextprotocol.io/schemas/2025-12-11/server.schema.json",
    "remotes": [
      {
        "url": "https://hornlib.com/api/mcp",
        "type": "streamable-http"
      }
    ],
    "version": "1.0.3",
    "repository": {
      "url": "https://github.com/HornLib/mcp-server",
      "source": "github"
    },
    "websiteUrl": "https://hornlib.com",
    "description": "Look up French Horn F/Bb double horn valve fingerings, trigger combinations & partials."
  }
}

Maintained byhornlib.com(verified)Also a maintainer?

Try it

Call this server's tools from your browser. Nothing to install.

https://hornlib.com/api/mcp

Requests go through mcptry because browsers can't call most MCP servers directly. Header values are sent to the server for that request only and are never stored or logged.

Tool list from our last check. Connect live to refresh it.

analyze_horn_harmonic_series Read-only

Analyze the natural harmonic overtone series (partials 2 through 16) for any F-horn or Bb-horn valve combination, returning equal-temperament cent deviations (e.g. -14 cents on 5th partial, -31 cents on 7th partial) and alternate valve solutions.

hornSidestring, required

Horn side tube length: "F" (open fundamental F1) or "Bb" (trigger fundamental Bb1)

valvesstring

Valve combination (e.g. "0", "2", "1", "1-2", "2-3", "1-3", "1-2-3")

Install

Pick your client. Values in capitals, like YOUR_TOKEN, are yours to fill in.

One click: Add to Cursor Add to VS Code Add to LM Studio Add to Goose

Run in a terminal

claude mcp add --transport http mcp https://hornlib.com/api/mcp

Tools (8)

Tool list last changed Nov 8, 2026.

analyze_horn_harmonic_series

read-only

Argument	Type	Description
valves	string	Valve combination (e.g. "0", "2", "1", "1-2", "2-3", "1-3", "1-2-3")
hornSide*	string	Horn side tube length: "F" (open fundamental F1) or "Bb" (trigger fundamental Bb1)

Input schema (JSON)

{
  "type": "object",
  "required": [
    "hornSide"
  ],
  "properties": {
    "valves": {
      "type": "string",
      "description": "Valve combination (e.g. \"0\", \"2\", \"1\", \"1-2\", \"2-3\", \"1-3\", \"1-2-3\")"
    },
    "hornSide": {
      "enum": [
        "F",
        "Bb"
      ],
      "type": "string",
      "description": "Horn side tube length: \"F\" (open fundamental F1) or \"Bb\" (trigger fundamental Bb1)"
    }
  }
}

diagnose_horn_intonation_and_hand_position

Diagnose pitch tendencies, right-hand bell acoustics, and Stopped Horn (gestopft / +) transposition rules (transpose down a half-step on the F horn side to compensate for the +1/2 step acoustic shortening when sealing the bell).

read-only

Argument	Type	Description
topic*	string	Acoustic or intonation topic to diagnose

Input schema (JSON)

{
  "type": "object",
  "required": [
    "topic"
  ],
  "properties": {
    "topic": {
      "enum": [
        "stopped-horn",
        "muted-horn",
        "sharp-high-register",
        "flat-5th-partial",
        "right-hand-cup"
      ],
      "type": "string",
      "description": "Acoustic or intonation topic to diagnose"
    }
  }
}

generate_daily_horn_warmup_routine

Generate a structured daily French Horn warm-up schedule covering harmonic lip slurs, Farkas long tones, double/triple tonguing, low-register pedal tones, and dynamic control tailored to available practice time.

read-only

Argument	Type	Description
focusArea	string	Primary technical focus area for the session
durationMinutes*	number	Available warm-up duration in minutes (e.g. 15, 30, 45, 60)

Input schema (JSON)

{
  "type": "object",
  "required": [
    "durationMinutes"
  ],
  "properties": {
    "focusArea": {
      "enum": [
        "balanced",
        "high-range-endurance",
        "low-register-response",
        "legato-lip-slurs",
        "articulation-agility"
      ],
      "type": "string",
      "description": "Primary technical focus area for the session"
    },
    "durationMinutes": {
      "type": "number",
      "description": "Available warm-up duration in minutes (e.g. 15, 30, 45, 60)"
    }
  }
}

get_orchestral_horn_excerpt_guide

Retrieve audition preparation notes, recommended F/Bb trigger fingerings, breathing plans, and historical crook transpositions for standard orchestral French Horn excerpts (Mozart 4, Beethoven 3/7/9, Brahms 1/3, Mahler 5, Strauss Till Eulenspiegel / Ein Heldenleben, Tchaikovsky 5).

read-only

Argument	Type	Description
composerOrWork*	string	Composer or orchestral work name (e.g. "Mozart 4", "Strauss Till", "Tchaikovsky 5", "Brahms 3", "Beethoven 7", "Mahler 5")

Input schema (JSON)

{
  "type": "object",
  "required": [
    "composerOrWork"
  ],
  "properties": {
    "composerOrWork": {
      "type": "string",
      "description": "Composer or orchestral work name (e.g. \"Mozart 4\", \"Strauss Till\", \"Tchaikovsky 5\", \"Brahms 3\", \"Beethoven 7\", \"Mahler 5\")"
    }
  }
}

lookup_french_horn_fingering

Look up standard F-side and Bb-trigger valve fingerings, concert pitch transposition (down a perfect fifth), and harmonic tendency notes for any written French Horn note (e.g. "C4", "F4", "G4", "Bb4", "C5", "F5").

read-only

Argument	Type	Description
note*	string	Written note name with octave (e.g. "C4", "F4", "G4", "Bb4", "C5", "F5")

Input schema (JSON)

{
  "type": "object",
  "required": [
    "note"
  ],
  "properties": {
    "note": {
      "type": "string",
      "description": "Written note name with octave (e.g. \"C4\", \"F4\", \"G4\", \"Bb4\", \"C5\", \"F5\")"
    }
  }
}

lookup_horn_trill_fingering

Find optimal whole-tone and half-step trill fingerings on the F/Bb double horn, identifying whether a trill should be executed as a mechanical valve trill or a harmonic lip trill (common above written E5 on the F side).

read-only

Argument	Type	Description
baseNote*	string	Principal written note of the trill (e.g. "F#4", "G4", "A4", "B4", "C5", "D5")
interval	string	Trill interval above the principal note ("half-step" or "whole-step")

Input schema (JSON)

{
  "type": "object",
  "required": [
    "baseNote"
  ],
  "properties": {
    "baseNote": {
      "type": "string",
      "description": "Principal written note of the trill (e.g. \"F#4\", \"G4\", \"A4\", \"B4\", \"C5\", \"D5\")"
    },
    "interval": {
      "enum": [
        "half-step",
        "whole-step"
      ],
      "type": "string",
      "description": "Trill interval above the principal note (\"half-step\" or \"whole-step\")"
    }
  }
}

recommend_beginner_horn_and_mouthpiece

Compare Kruspe wrap (Conn 8D style, dark orchestral projection, larger bell throat) vs Geyer/Knopf wrap (Yamaha 667/671, Alexander 103 style, smooth slurs, medium throat) and recommend mouthpiece cup depths and rim diameters by player level.

read-only

Argument	Type	Description
playerLevel*	string	Player experience level or orchestral role

Input schema (JSON)

{
  "type": "object",
  "required": [
    "playerLevel"
  ],
  "properties": {
    "playerLevel": {
      "enum": [
        "beginner",
        "intermediate-high-school",
        "conservatory-orchestral",
        "high-horn-principal",
        "low-horn-section"
      ],
      "type": "string",
      "description": "Player experience level or orchestral role"
    }
  }
}

transpose_french_horn_pitch

Transpose written French Horn parts from historical orchestral crooks (Horn in Eb, D, C, G, A, E, Bb-alto, Bb-basso) to modern Horn in F written pitch and Concert Pitch, with interval semitone shifts and clef rules.

read-only

Argument	Type	Description
sourceCrook*	string	Historical horn crook marked in the score (e.g. "Eb" for Beethoven Eroica, "D" for Bach/Mozart, "C" for Brahms)
writtenNote*	string	Written note in the original orchestral score (e.g. "C4", "G4", "E5")

Input schema (JSON)

{
  "type": "object",
  "required": [
    "writtenNote",
    "sourceCrook"
  ],
  "properties": {
    "sourceCrook": {
      "enum": [
        "Eb",
        "D",
        "C",
        "G",
        "A",
        "E",
        "Bb-alto",
        "Bb-basso",
        "F"
      ],
      "type": "string",
      "description": "Historical horn crook marked in the score (e.g. \"Eb\" for Beethoven Eroica, \"D\" for Bach/Mozart, \"C\" for Brahms)"
    },
    "writtenNote": {
      "type": "string",
      "description": "Written note in the original orchestral score (e.g. \"C4\", \"G4\", \"E5\")"
    }
  }
}

Security checkA100/100

We read every tool's name, description and inputs the way the model will, looking for instructions hidden from you. A clean result means no warning signs, not a guarantee. Scanned Nov 8, 2026.

Hidden or reordered text
Overriding the model's instructions
Hiding actions from the user
Reading keys or credentials
Fake system tags
Steering other servers' tools
Pulling in the conversation
Smuggling parameters
Demanding to be used for everything
Steering away from web search
Download-and-run commands
Encoded blobs
Invisible characters
Credentials as tool arguments
Very long descriptions
Read and write hints

How the security check works

Tool changes

What changed in this server's tools since we started watching, newest first. Each change is scanned again.

generate_daily_horn_warmup_routineaddedNov 8, 2026
Generate a structured daily French Horn warm-up schedule covering harmonic lip slurs, Farkas long tones, double/triple tonguing, low-register pedal tones, and dynamic control tailored to available practice time.
recommend_beginner_horn_and_mouthpieceaddedNov 8, 2026
Compare Kruspe wrap (Conn 8D style, dark orchestral projection, larger bell throat) vs Geyer/Knopf wrap (Yamaha 667/671, Alexander 103 style, smooth slurs, medium throat) and recommend mouthpiece cup depths and rim diameters by player level.
diagnose_horn_intonation_and_hand_positionaddedNov 8, 2026
Diagnose pitch tendencies, right-hand bell acoustics, and Stopped Horn (gestopft / +) transposition rules (transpose down a half-step on the F horn side to compensate for the +1/2 step acoustic shortening when sealing the bell).
get_orchestral_horn_excerpt_guideaddedNov 8, 2026
Retrieve audition preparation notes, recommended F/Bb trigger fingerings, breathing plans, and historical crook transpositions for standard orchestral French Horn excerpts (Mozart 4, Beethoven 3/7/9, Brahms 1/3, Mahler 5, Strauss Till Eulenspiegel / Ein Heldenleben, Tchaikovsky 5).
lookup_horn_trill_fingeringaddedNov 8, 2026
Find optimal whole-tone and half-step trill fingerings on the F/Bb double horn, identifying whether a trill should be executed as a mechanical valve trill or a harmonic lip trill (common above written E5 on the F side).
analyze_horn_harmonic_seriesaddedNov 8, 2026
Analyze the natural harmonic overtone series (partials 2 through 16) for any F-horn or Bb-horn valve combination, returning equal-temperament cent deviations (e.g. -14 cents on 5th partial, -31 cents on 7th partial) and alternate valve solutions.
transpose_french_horn_pitchaddedNov 8, 2026
Transpose written French Horn parts from historical orchestral crooks (Horn in Eb, D, C, G, A, E, Bb-alto, Bb-basso) to modern Horn in F written pitch and Concert Pitch, with interval semitone shifts and clef rules.

lookup_french_horn_fingeringchanged (inputs)Nov 8, 2026

{
  "type": "object",
  "required": [
    "note"
  ],
  "properties": {
    "note": {
      "type": "string",
      "description": "Written note name with octave (e.g. \"F4\", \"G4\", \"Bb4\", \"C5\", \"F5\")"
    }
  }
}

{
  "type": "object",
  "required": [
    "note"
  ],
  "properties": {
    "note": {
      "type": "string",
      "description": "Written note name with octave (e.g. \"C4\", \"F4\", \"G4\", \"Bb4\", \"C5\", \"F5\")"
    }
  }
}

lookup_french_horn_fingeringchanged (title, hints)Nov 8, 2026