Voice School Lesson Booking
REMOTE · MCP.VOICE-SCHOOL.COM · SCANNED SEP 28
Request online singing lessons with Voice School and Daria Klishina.
Available components
Deprecated
This server is marked deprecated in the MCP registry.
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 Security57
- The endpoint's TLS certificate is valid, in date, and uses a strong key. View diagnostics → Pass
- Authorisation not fully verified: no authorisation is required to call this server, and 9 tool(s) never declared a destructiveHint. The MCP spec treats an absent hint as destructive by default, so we cannot call this surface safe. See how to fix → View diagnostics → Unverified
- HTTPS is enforced; there's no plaintext access path. View diagnostics → Pass
- HSTS check failed: the Strict-Transport-Security header is absent. See how to fix → View diagnostics → Fail
- 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 Usability61
- AI-judged instruction clarity (fair).Partial
- Tool/resource definitions use about 867 tokens (~96/item across 9 items; 9 tools + 0 resources), lean.Pass
- Usage-examples check failed: none of the tools include examples. See how to fix → Fail
Stability & Change Management100
- No destabilizing schema changes in the last 30 days.Pass
Tool Coverage71
- 100% of tools have a non-trivial description (not blank, and not just the tool's name).Pass
- 0% of tool parameters carry a description.Fail
- Structured output schemas are declared (100% of tools); any adoption earns full credit.Pass
Tool Safety75
- No prompt-injection markers were found in the server instructions, tool names or descriptions we captured.Pass
- 0 of 1 tool(s) whose name or description implies an irreversible operation declare an MCP destructiveHint annotation; "publish_social_post" implies "publish" and declares no destructiveHint at all, which the MCP spec reads as destructive by default. See how to fix → Fail
- An AI judge read all 10 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
How do I install the Voice School Lesson Booking MCP server?
Voice School Lesson Booking is a hosted endpoint at https://mcp.voice-school.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 · mcp.voice-school.com
claude mcp add --transport http com-voice-school-lesson-booking 'https://mcp.voice-school.com/mcp'
{
"mcpServers": {
"com-voice-school-lesson-booking": {
"url": "https://mcp.voice-school.com/mcp"
}
}
} {
"servers": {
"com-voice-school-lesson-booking": {
"type": "http",
"url": "https://mcp.voice-school.com/mcp"
}
}
} [mcp_servers.com-voice-school-lesson-booking] url = "https://mcp.voice-school.com/mcp"
{
"$schema": "https://opencode.ai/config.json",
"mcp": {
"com-voice-school-lesson-booking": {
"type": "remote",
"url": "https://mcp.voice-school.com/mcp",
"enabled": true
}
}
} openclaw mcp add com-voice-school-lesson-booking --url 'https://mcp.voice-school.com/mcp' --transport streamable-http
mcp_servers:
com-voice-school-lesson-booking:
url: "https://mcp.voice-school.com/mcp" {
"McpServers": {
"com-voice-school-lesson-booking": {
"Transport": "http",
"Url": "https://mcp.voice-school.com/mcp"
}
}
} assistant mcp add com-voice-school-lesson-booking -t streamable-http -u 'https://mcp.voice-school.com/mcp'
{
"mcpServers": {
"com-voice-school-lesson-booking": {
"type": "http",
"url": "https://mcp.voice-school.com/mcp"
}
}
} The mcpServers block is a cross-client convention. Remote transports vary, so check your client's docs.
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.
- 28 Sept 26 0
- We updated how we score, so this day's move reflects our rubric, not a change to the server See what changed → functional
- 25 Sept 26 0
- We updated how we score, so this day's move reflects our rubric, not a change to the server See what changed → functional
- 7 Sept 26 0
- Stability: 0.97 → pass security
- 6 Sept 26 +1
No change was recorded against any check on this day. Stability & Change Management went from 93 to 97. That category is still filling its 30-day observation window: 28 days of observed history at the previous scan, 29 at this one. The score rises as the window fills, whether or not the server changes.
- 4 Sept 26 +1
No change was recorded against any check on this day. Stability & Change Management went from 87 to 90. That category is still filling its 30-day observation window: 26 days of observed history at the previous scan, 27 at this one. The score rises as the window fills, whether or not the server changes.
- 2 Sept 26 +1
No change was recorded against any check on this day. Stability & Change Management went from 80 to 83. That category is still filling its 30-day observation window: 24 days of observed history at the previous scan, 25 at this one. The score rises as the window fills, whether or not the server changes.
- 31 Aug 26 +1
No change was recorded against any check on this day. Stability & Change Management went from 73 to 77. That category is still filling its 30-day observation window: 22 days of observed history at the previous scan, 23 at this one. The score rises as the window fills, whether or not the server changes.
- 28 Aug 26 0
- Schema quality: 353 → 867 ▼ functional
- Schema quality: good → fair functional
- Destructive annotations: pass → 0 functional
- New tool “create_social_post_draft” functional
- New tool “list_social_posts” functional
- New tool “publish_social_post” functional
- New tool “upsert_social_channel” functional
- New tool “upsert_trainer_social_link” functional
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 28 Sept 2026 · Probed https://mcp.voice-school.com/mcp
TLS valid
Negotiated TLS 1.3 with TLS_AES_128_GCM_SHA256 .
| Subject | Issuer | Valid from | Valid until | Key | Signature | Serial |
|---|---|---|---|---|---|---|
| CN=voice-school.com | CN=YE1,O=Let's Encrypt,C=US | 17 Aug 2026 | 15 Nov 2026 | ECDSA 256 | ECDSA-SHA384 | 65952008459bba145970b925153c560eed1 |
| SANs: *.voice-school.com, voice-school.com | ||||||
| CN=YE1,O=Let's Encrypt,C=US (CA) | CN=Root YE,O=ISRG,C=US | 3 Sept 2025 | 2 Sept 2028 | ECDSA 384 | ECDSA-SHA384 | 5ddd70dd31f801c85c186a7a04b80afe |
| CN=Root YE,O=ISRG,C=US (CA) | CN=ISRG Root X2,O=Internet Security Research Group,C=US | 13 May 2026 | 2 Sept 2032 | ECDSA 384 | ECDSA-SHA384 | 872165fc34b6e5fba8add5b3705fb53a |
| CN=ISRG Root X2,O=Internet Security Research Group,C=US (CA) | CN=ISRG Root X1,O=Internet Security Research Group,C=US | 13 May 2026 | 2 Sept 2032 | ECDSA 384 | SHA256-RSA | 6c8f1dc727c7117f7baf853ac980f9cd |
Background: What to check on a remote MCP endpoint →
DNSSEC insecure
Validation of mcp.voice-school.com. — Not signed
| Zone | DS | Keys | Algorithms | Outcome |
|---|---|---|---|---|
| . | trust_anchor | 20326, 38696 | 8, 8 | Verified |
| com. | present | 19718 | 13 | Verified |
| voice-school.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 |
Background: How OAuth 2.1 works in the 2026 MCP spec →
Transports 2 probes
| Transport | URL | Outcome | Status | Location |
|---|---|---|---|---|
| streamable-http | https://mcp.voice-school.com/mcp | Verified | 200 | |
| http (plaintext) | http://mcp.voice-school.com/mcp | HTTPS enforced | 301 | https://mcp.voice-school.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 →
create_lesson_request ~139
Create a request-first lead for an online vocal lesson. Requires name and at least one contact method. This never confirms a lesson or creates a private schedule item.
| Name | Type | Req | Description |
|---|---|---|---|
| city_context | string | – | – |
| coach_slug | string | – | – |
| string | – | – | |
| language | string | – | – |
| message | string | – | – |
| name | string | yes | – |
| phone | string | – | – |
| requested_start | string | – | – |
| requester_timezone | string | – | – |
| service_slug | string | – | – |
| source_agent | string | – | – |
| telegram | string | – | – |
| string | – | – |
Structured output declared, but exposes no named fields.
No examples provided.
create_social_post_draft ~207
Create or update a trainer social post with SEO title, description, keywords, tags, original source URL and ordered text/video blocks. Requires SOCIAL_POSTS_MCP_WRITE_TOKEN as write_token.
| Name | Type | Req | Description |
|---|---|---|---|
| blocks | – | – | – |
| body | string | – | – |
| channel_slug | string | yes | – |
| channel_title | string | yes | – |
| channel_url | string | yes | – |
| coach_slug | string | yes | – |
| excerpt | string | – | – |
| external_post_id | string | – | – |
| keywords | – | – | – |
| language_code | string | – | – |
| meta_description | string | – | – |
| publish | boolean | – | – |
| raw_text | string | – | – |
| seo_title | string | – | – |
| slug | string | – | – |
| source_platform | string | – | – |
| source_post_url | string | yes | – |
| source_published_at | string | – | – |
| tags | – | – | – |
| title | string | – | – |
| write_token | string | yes | – |
Structured output declared, but exposes no named fields.
No examples provided.
list_lesson_options ~41
List active lesson services and prices for a coach from the live Voice School database.
| Name | Type | Req | Description |
|---|---|---|---|
| coach_slug | string | – | – |
| language | string | – | – |
Structured output declared, but exposes no named fields.
No examples provided.
list_social_posts ~58
List published trainer social posts with canonical and original source URLs.
| Name | Type | Req | Description |
|---|---|---|---|
| channel_slug | string | – | – |
| coach_slug | string | – | – |
| language | string | – | – |
| limit | integer | – | – |
| platform | string | – | – |
Structured output declared, but exposes no named fields.
No examples provided.
publish_social_post ~47
Publish a prepared trainer social post after source URL validation. Requires SOCIAL_POSTS_MCP_WRITE_TOKEN as write_token.
| Name | Type | Req | Description |
|---|---|---|---|
| slug | string | yes | – |
| write_token | string | yes | – |
Structured output declared, but exposes no named fields.
No examples provided.
search_lesson_availability ~74
Find free requestable lesson times using coach working windows and busy intervals. The response never includes private learner data.
| Name | Type | Req | Description |
|---|---|---|---|
| coach_slug | string | – | – |
| date_from | – | – | – |
| date_to | – | – | – |
| limit | integer | – | – |
| service_slug | string | – | – |
| user_timezone | – | – | – |
Structured output declared, but exposes no named fields.
No examples provided.
upsert_social_channel ~103
Add or update a social channel/group that trainer posts are attached to. Requires SOCIAL_POSTS_MCP_WRITE_TOKEN as write_token.
| Name | Type | Req | Description |
|---|---|---|---|
| channel_type | string | – | – |
| coach_slug | string | yes | – |
| description | string | – | – |
| is_active | boolean | – | – |
| platform | string | yes | – |
| slug | string | yes | – |
| title | string | yes | – |
| url | string | yes | – |
| write_token | string | yes | – |
Structured output declared, but exposes no named fields.
No examples provided.
upsert_trainer_social_link ~99
Add or update a public round social icon link for a Voice School trainer. Requires SOCIAL_POSTS_MCP_WRITE_TOKEN as write_token.
| Name | Type | Req | Description |
|---|---|---|---|
| coach_slug | string | yes | – |
| display_order | integer | – | – |
| handle | string | – | – |
| is_active | boolean | – | – |
| label | string | – | – |
| platform | string | yes | – |
| url | string | yes | – |
| write_token | string | yes | – |
Structured output declared, but exposes no named fields.
No examples provided.
voice_school_info ~32
Public description, policy, and catalog links for Voice School online vocal lesson requests.
| Name | Type | Req | Description |
|---|---|---|---|
| language | string | – | – |
Structured output declared, but exposes no named fields.
No examples provided.
What is the Voice School Lesson Booking MCP server?
Voice School Lesson Booking is an MCP server listed in the public MCP registry as com.voice-school/lesson-booking. Request online singing lessons with Voice School and Daria Klishina. This page covers its hosted endpoint (https://mcp.voice-school.com/mcp).
Is the Voice School Lesson Booking MCP server safe to use?
Voice School Lesson Booking scores 72 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 Voice School Lesson Booking MCP server expose?
Voice School Lesson Booking exposes 9 tools: voice_school_info, list_lesson_options, search_lesson_availability, create_lesson_request, upsert_trainer_social_link, and 4 more. Their descriptions and schemas cost roughly 800 tokens of context every time the server is loaded.
Does the Voice School Lesson Booking MCP server require authentication?
No. We connected to Voice School Lesson Booking without credentials and it answered, so anything it exposes is reachable by anyone who knows the address.
Is the Voice School Lesson Booking MCP server still maintained?
Voice School Lesson Booking is marked deprecated in the MCP registry. We last reached this channel on 28 September 2026. Those dates come from our own scans of the registry and the channel itself, not from anything the publisher announced.