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BoringToolsKit
io.github.roadtogideon222-byte/boringtoolskit in the official MCP registry.
Endpoint https://boringtoolskit.com/mcp. Source: github.com/roadtogideon222-byte/boringtoolskit.
The registry describes it as: 36 free private calculator tools for Claude. No accounts, no data leaves your session.
We read its 36 tools on 2026-10-27. Nothing in them matched our tool-poisoning rules.
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
tip_bill_split discount_percent_off bmi bmr_tdee mortgage_payment auto_loan compound_interest savings_growth simple_interest calorie percentage square_footage apy win_loss_percentage slope rule_of_72 cagr remainder combinations margin_of_error va_mortgage gross_rent_multiplier emergency_fund dividend_reinvestment budget_50_30_20 growing_degree_day insulation roofing maintenance_calories protein_molecular_weight key_transposition audio_time_stretch youtube_revenue ceiling_tile boat_loan pressure
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[](https://lazaretto.dev/mcp-registry/io-github-roadtogideon222-byte-boringtoolskit)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.