# io.github.MelMayssonOwen/clef (remote · clefdrills.com)

Read-only music guides, chord transposition, piano chord spelling and guitar-tab pitch mapping.

- Trust score: 70/100 (medium)
- Registry status: active
- Liveness: live
- Owner verified: no
- Last scored: 2026-10-04

## Components

- remote · `clefdrills.com`: 70/100 (this document), [markdown](https://verifymcp.io/servers/melmayssonowen-clef/clefdrills.md), [page](https://verifymcp.io/servers/melmayssonowen-clef/clefdrills)

## Channel facts

- Endpoint: `https://clefdrills.com/mcp`
- Transports: `streamable-http`
- Auth: `none`
- Version: `1.0.0`

## 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 2026-10-04.

- **Endpoint Security**: 74/100
  - 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.
  - HSTS check failed: the Strict-Transport-Security header is absent.
  - 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**: 81/100
  - 100% of prompts and resources have a non-trivial description (not blank, and not just the item's name).
  - AI-judged instruction clarity (good).
  - Tool/resource definitions use about 1410 tokens (~41/item across 34 items; 4 tools + 30 resources), lean.
  - Usage-examples check failed: none of the tools include examples.
- **Stability & Change Management**: 3/100
  - Stability observed for 1 of 30 days with no destabilising changes; credit accrues until the full window elapses.
- **Tool Coverage**: 67/100
  - 100% of tools have a non-trivial description (not blank, and not just the tool's name).
  - 0% 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 4 captured tool definition(s), and no name or description among them implies an irreversible operation.
  - An AI judge read all 5 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 io.github.MelMayssonOwen/clef MCP server?

io.github.MelMayssonOwen/clef is a hosted endpoint at https://clefdrills.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 melmayssonowen-clef 'https://clefdrills.com/mcp'
```

### Cursor

```json
{
  "mcpServers": {
    "melmayssonowen-clef": {
      "url": "https://clefdrills.com/mcp"
    }
  }
}
```

### VS Code

```json
{
  "servers": {
    "melmayssonowen-clef": {
      "type": "http",
      "url": "https://clefdrills.com/mcp"
    }
  }
}
```

### Codex

```toml
[mcp_servers.melmayssonowen-clef]
url = "https://clefdrills.com/mcp"
```

### opencode

```json
{
  "$schema": "https://opencode.ai/config.json",
  "mcp": {
    "melmayssonowen-clef": {
      "type": "remote",
      "url": "https://clefdrills.com/mcp",
      "enabled": true
    }
  }
}
```

### OpenClaw

```bash
openclaw mcp add melmayssonowen-clef --url 'https://clefdrills.com/mcp' --transport streamable-http
```

### Hermes

```yaml
mcp_servers:
  melmayssonowen-clef:
    url: "https://clefdrills.com/mcp"
```

### Netclaw

```json
{
  "McpServers": {
    "melmayssonowen-clef": {
      "Transport": "http",
      "Url": "https://clefdrills.com/mcp"
    }
  }
}
```

### Vellum

```bash
assistant mcp add melmayssonowen-clef -t streamable-http -u 'https://clefdrills.com/mcp'
```

### Other

```json
{
  "mcpServers": {
    "melmayssonowen-clef": {
      "type": "http",
      "url": "https://clefdrills.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.

### 2026-10-04 (score 70, 0)

- [functional improvement] Stability: unverified → 0.03

### 2026-10-03 (score 70)

First indexed and scored.

## MCP tools (4)

### `find_music_guides` (~36 tokens)

Find Clef instructional guides by words in the title and description. Guides are not file converters.

Input parameters:

- `query` (string, required)

### `transpose_chords` (~55 tokens)

Transpose chord symbols, including slash bass notes. Does not process audio, lyrics, or notation files.

Input parameters:

- `chords` (string, required)
- `preferFlats` (boolean)
- `semitones` (integer, required)

### `spell_piano_chord` (~46 tokens)

Spell a supported chord as piano pitches with octave and MIDI values. This does not create a rhythmic arrangement.

Input parameters:

- `octave` (integer)
- `symbol` (string, required)

### `tab_to_piano_notes` (~51 tokens)

Convert six-string ASCII guitar tab to sounding piano pitches. Tab spacing does not specify note duration. No GP files or audio uploads.

Input parameters:

- `capo` (integer)
- `tab` (string, required)

## Diagnostics

Captured diagnostic sections: TLS, DNSSEC, Authorisation, Transports. The full working is on the page: https://verifymcp.io/servers/melmayssonowen-clef/clefdrills#diagnostics

## Score history

- 2026-10-04: 70
- 2026-10-03: 70

## Common questions

### What is the io.github.MelMayssonOwen/clef MCP server?

io.github.MelMayssonOwen/clef is an MCP server listed in the public MCP registry as io.github.MelMayssonOwen/clef. Read-only music guides, chord transposition, piano chord spelling and guitar-tab pitch mapping. This page covers its hosted endpoint (https://clefdrills.com/mcp).

### Is the io.github.MelMayssonOwen/clef MCP server safe to use?

io.github.MelMayssonOwen/clef scores 70 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 io.github.MelMayssonOwen/clef MCP server expose?

io.github.MelMayssonOwen/clef exposes 4 tools: find_music_guides, transpose_chords, spell_piano_chord, tab_to_piano_notes. Their descriptions and schemas cost roughly 188 tokens of context every time the server is loaded.

### Does the io.github.MelMayssonOwen/clef MCP server require authentication?

No. We connected to io.github.MelMayssonOwen/clef without credentials and it answered, so anything it exposes is reachable by anyone who knows the address.

### Is the io.github.MelMayssonOwen/clef MCP server still maintained?

io.github.MelMayssonOwen/clef is still listed as active in the MCP registry. We last reached this channel on 4 October 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://clefdrills.com/mcp
- Changelog RSS feed: https://verifymcp.io/servers/melmayssonowen-clef/clefdrills.xml
- Changelog JSON feed: https://verifymcp.io/servers/melmayssonowen-clef/clefdrills.json
- HTML version of this page: https://verifymcp.io/servers/melmayssonowen-clef/clefdrills