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Tenjin
blog.tenjin/tenjin in the official MCP registry.
Endpoint https://tenjin.sh/api/mcp.
The registry describes it as: Search, read & publish paid essays. Pay-per-read in USDC on Base (x402); wallet-only, no account.
We read its 23 tools on 2026-10-25. 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
list_articles search resolve_keys get_article get_creator list_tags list_creators get_trending pay_and_read answer publish_essay update_essay get_my_post delete_essay list_my_posts get_profile update_profile get_my_stats get_my_events upload_image get_library submit_feedback report_search_outcome
Run this server? Show the check in your README
The badge reflects the latest weekly read: 
[](https://lazaretto.dev/mcp-registry/blog-tenjin-tenjin)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.
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