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Blackbook Protocol Advisor

io.github.koynlabs/blackbook-advisor in the official MCP registry. Endpoint https://theblackbook.pro/. Source: github.com/koynlabs/mcp-blackbook.

The registry describes it as: Purchaser-gated MCP for Vault, HMRC TRS, 95/5 equity, and Companies House PSC.

We read its 25 tools on 2026-10-29. 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.

Connect it

The endpoint answers MCP over HTTP; that is how we read it. Add it to your client:

Claude Code

claude mcp add --transport http blackbook-advisor https://theblackbook.pro/

Cursor: ~/.cursor/mcp.json

{
  "mcpServers": {
    "blackbook-advisor": {
      "url": "https://theblackbook.pro/"
    }
  }
}

VS Code

code --add-mcp '{"name":"blackbook-advisor","type":"http","url":"https://theblackbook.pro/"}'

Some servers ask you to sign in the first time a client connects, or want a key from the people who run them; the server's own docs say which. The free lazaretto-guard plugin reads a server's tools the moment Claude Code adds it and asks you if one of our rules matches.

Tools it advertises

search_book get_module_playbook list_skills get_skill list_modules get_hmrc_guidance get_companies_house_guidance run_trust_intake draft_form_answers prepare_portal_fill generate_review_bundle list_risk_flags list_implementation_modes get_self_serve_portal start_browser_session open_portal explain_current_screen list_fillable_fields fill_fields request_user_action wait_for_user_ready prepare_submit_confirmation confirm_and_submit end_browser_session get_legal_boundary

Run this server? Show the check in your README

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Markdown

[![MCP tool check](https://lazaretto.dev/mcp-registry/io-github-koynlabs-blackbook-advisor/badge.svg)](https://lazaretto.dev/mcp-registry/io-github-koynlabs-blackbook-advisor)

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.