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Craft Quantities: construction material calculators
com.craftquantities/engine in the official MCP registry.
Endpoint https://api.craftquantities.com/mcp.
The registry describes it as: Construction quantities from cited calculators, takeoffs, a planner and house drawings. No prices.
We read its 56 tools on 2026-10-27. 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
search fetch get_calculator calculate convert_units get_sources open_in_site_link get_takeoff run_takeoff get_example run_example create_project_file_from_calculations create_project_file_from_takeoffs create_project_file_from_house create_project_file_from_plan create_project_file_from_drawing check_quote estimate_house get_planner plan_room plan_project create_drawing import_quote diagnose_symptom solve_backwards market_documents translate_term create_supplier_quote_request get_benchmark measure_sketch export_drawing layout_reinforcement calculate_batch update_project classify_items resolve_id plan_programme optimise_cuts estimate_hours compare_on_job run_guide_chain run_example_live stair_flight level_quotes write_variation write_proposal make_job_sheet make_canvas_link get_illustration trim_corner plan_room_trim scribe_template fit_panel fit_worktop_run miter_chart print_template
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The badge reflects the latest weekly read: 
[](https://lazaretto.dev/mcp-registry/com-craftquantities-engine)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.