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Riddle
com.riddle/creator in the official MCP registry.
Endpoint https://www.riddle.com/creator/api/v3/mcp.
The registry describes it as: Build, publish and analyze quizzes, polls, forms and personality tests. Riddle account required.
We read its 41 tools on 2026-10-28. 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
media_upload_link media_delete riddle_template_create riddle_template_update riddle_template_list riddle_template_public_list riddle_template_get riddle_template_use riddle_tag_list riddle_tag riddle_tag_delete ping riddle_list riddle_get riddle_get_embed_code riddle_publish riddle_rename riddle_delete riddle_move whoami question_bank_create question_bank_list question_bank_get question_bank_manage question_bank_item question_bank_discard_changes question_bank_delete question_bank_get_items question_bank_tag palette_get palette_customize integration_list riddle_builder_create riddle_builder_update riddle_builder_validate reference_get stats_fetch project_list project_get project_get_settings riddle_preview
Run this server? Show the check in your README
The badge reflects the latest weekly read: 
[](https://lazaretto.dev/mcp-registry/com-riddle-creator)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.