Zeltor Music Tools
REMOTE · ZELTORLABS.COM
Check if two songs mix (Camelot key, BPM), read shared song DNA reports, tempo and nightcore math.
Available components
Last scanned (43 minutes ago)
Scores higher than 64% of remote servers
Reachable. Last reached 5 Nov 2026.
Category Entertainment and Games
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. How we score → Why this is hard to score →
Endpoint Security80
- The endpoint's TLS certificate is valid, in date, and uses a strong key. View diagnostics → Pass
- No authorisation is required to call this server. Every tool declares its destructiveHint and none is destructive, so open access doesn't expose one. See how to fix → View diagnostics → Partial
- HTTPS is enforced; there's no plaintext access path. View diagnostics → Pass
- The HSTS (Strict-Transport-Security) header is present. View diagnostics → Pass
- DNSSEC check failed: this domain isn't protected by DNSSEC. See how to fix → View diagnostics → Fail
Transport & Reachability100
- Verified streamable-http transport via a live MCP handshake. View diagnostics → Pass
Schema Quality & AI Usability70
- AI-judged instruction clarity (excellent).Pass
- 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. See how to fix → Fail
- Usage-examples check failed: none of the tools include examples. See how to fix → Fail
Stability & Change Management17
- Stability observed for 5 of 30 days with no destabilising changes; credit accrues until the full window elapses.Partial
Tool Coverage100
- 100% of tools have a non-trivial description (not blank, and not just the tool's name).Pass
- 100% of tool parameters carry a description.Pass
Tool Safety100
- No prompt-injection markers were found in the server instructions, tool names or descriptions we captured.Pass
- We read all 6 captured tool definition(s), and no name or description among them implies an irreversible operation.Pass
- An AI judge read all 7 captured unit(s) of tool text and found none that tries to manipulate the model reading it.Pass
Capabilities100
- Implements a supported MCP spec version (2025-11-25); the latest is 2026-07-28.Pass
Every change we have recorded for this component, newest first. Security-relevant changes are always shown. ▲ marks a change for the better, ▼ a change for the worse; unmarked changes are neutral.
- 5 Nov 26 +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.
- 2 Nov 26 +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.
- 1 Nov 26 0
- Stability: unverified → 0.03 ▲ functional
- 31 Oct 26 73
First indexed and scored.
Diagnostic detail from the automated scan of this channel: what the scanner observed at each step, so you can see exactly where a check passed or failed. It is informational only and never changes the trust score.
Captured 5 Nov 2026 · Probed https://zeltorlabs.com/mcp
TLS valid
Negotiated TLS 1.3 with TLS_AES_128_GCM_SHA256 .
| Subject | Issuer | Valid from | Valid until | Key | Signature | Serial |
|---|---|---|---|---|---|---|
| CN=*.zeltorlabs.com | CN=YR1,O=Let's Encrypt,C=US | 26 Oct 2026 | 24 Jan 2027 | RSA 2048 | SHA256-RSA | 6314fc4219c78c8ca30716b81d48381d227 |
| SANs: *.zeltorlabs.com, zeltorlabs.com | ||||||
| CN=YR1,O=Let's Encrypt,C=US (CA) | CN=Root YR,O=ISRG,C=US | 3 Sept 2025 | 2 Sept 2028 | RSA 2048 | SHA256-RSA | a20253f15f2691c05dc1ce13b9bcca4e |
| CN=Root YR,O=ISRG,C=US (CA) | CN=ISRG Root X1,O=Internet Security Research Group,C=US | 13 May 2026 | 2 Sept 2032 | RSA 4096 | SHA256-RSA | f24b6d17f9d9ad7cb1c9fea78782699f |
Background: What to check on a remote MCP endpoint →
DNSSEC insecure
Validation of zeltorlabs.com. — Not signed
| Zone | DS | Keys | Algorithms | Outcome |
|---|---|---|---|---|
| . | trust_anchor | 20326, 38696 | 8, 8 | Verified |
| com. | present | 19718 | 13 | Verified |
| zeltorlabs.com. | absent | Unsigned (proven) parent-signed NSEC/NSEC3 proves an unsigned delegation |
Authentication No authorisation required
The endpoint answered without asking for a token. Anyone who knows the URL can reach it.
| Result | No authorisation required |
|---|---|
| HTTP status | 200 |
| Header | Value |
|---|---|
| strict-transport-security | max-age=63072000 |
Background: How OAuth 2.1 works in the 2026 MCP spec →
Transports 2 probes
| Transport | URL | Outcome | Status | Location |
|---|---|---|---|---|
| streamable-http | https://zeltorlabs.com/mcp | Verified | 200 | |
| http (plaintext) | http://zeltorlabs.com/mcp | HTTPS enforced | 308 | https://zeltorlabs.com/mcp |
The tools this component advertises to a client, with an estimated token cost for each. Expand a tool to see its parameters and schema. The per-tool counts are indicative and are not scored directly; the schema's total context footprint is one signal in Schema Quality & AI Usability. A tool's description is untrusted text the model reads on every call, which is what makes this list a security surface and not just an inventory: how tool poisoning works →
camelot Camelot code and compatible keys ~85
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).
| Name | Type | Req | Description |
|---|---|---|---|
| key | string | yes | Musical key: a name like "A minor", "Am", "F#m", "Bb major", "C", or a Camelot code like "8A". |
No output schema declared.
No examples provided.
check_mix Check if two songs mix ~218
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.
| Name | Type | Req | Description |
|---|---|---|---|
| bpm_a | number | yes | Track A tempo in BPM. |
| bpm_b | number | yes | Track B tempo in BPM. |
| key_a | string | yes | 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 | yes | 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". |
No output schema declared.
No examples provided.
song_report Read a shared Zeltor song report (song DNA) ~170
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).
| Name | Type | Req | Description |
|---|---|---|---|
| link | string | yes | The report share link, e.g. https://zeltorlabs.com/report/r/abc123def456, or its code. |
No output schema declared.
No examples provided.
speed_pitch Nightcore or slowed settings ~127
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.
| Name | Type | Req | Description |
|---|---|---|---|
| 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. |
No output schema declared.
No examples provided.
tempo_change Tempo change between two BPMs ~74
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.
| Name | Type | Req | Description |
|---|---|---|---|
| from_bpm | number | yes | Current tempo in BPM. |
| to_bpm | number | yes | Target tempo in BPM. |
No output schema declared.
No examples provided.
transpose Transpose a key ~97
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.
| Name | Type | Req | Description |
|---|---|---|---|
| key | string | yes | Musical key: a name like "A minor", "Am", "F#m", "Bb major", "C", or a Camelot code like "8A". |
| semitones | integer | yes | Semitones to move, negative is down. |
No output schema declared.
No examples provided.
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.
remote · zeltorlabs.com
claude mcp add --transport http com-zeltorlabs-music-tools 'https://zeltorlabs.com/mcp'
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.