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Voice School Lesson Booking
com.voice-school/lesson-booking in the official MCP registry.
Endpoint https://mcp.voice-school.com/mcp. Source: github.com/klishinoleg/voice.
The registry describes it as: Request online singing lessons with Voice School and Daria Klishina.
We read its 25 tools on 2026-10-22. Nothing in them matched our tool-poisoning rules. It also sets server instructions, text a client puts in front of the model on connect; those were read too.
A clean read means these rules found nothing, not that the server is harmless. A server can change its tools at any time, which is why the index reads it again every week.
Tools it advertises
voice_school_info list_lesson_options search_lesson_availability create_lesson_request upsert_trainer_social_link upsert_social_channel create_social_post_draft publish_social_post list_social_posts online_article_create online_article_publish online_articles_list online_article_get online_article_update online_content_get online_material_sections_get online_material_section_save online_material_section_preview online_material_section_publish online_content_edit online_teacher_profiles_get online_teacher_profiles_set online_content_preview online_article_audio_set online_media_prepare
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[](https://lazaretto.dev/mcp-registry/com-voice-school-lesson-booking)How this was checked
Lazaretto connects to the endpoint the way any MCP client does, asks the server to introduce itself and list its tools, and reads every name, description, parameter schema and server instruction for tool poisoning: hidden directive blocks, orders to read local secrets, parameters built to carry secrets or the conversation out, orders that redirect another server's tools, and invisible characters. It never calls a tool. What we found across the registry.
To run the same check every time Claude Code adds a server, install the free lazaretto-guard plugin. Browse every server in the index.