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Developer Utilities & Validators (Tanod)
dev.tanod/util in the official MCP registry.
Endpoint https://tanod.dev/mcp/util.
The registry describes it as: Cloud GPU prices per hour, plus developer helpers: hash, HMAC, JWT, IDs, JSON, cron, time zones.
We read its 40 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
text_encode hash_text hmac_sign_verify generate_ids generate_random validate_json convert_data validate_identifier parse_phone_number lookup_phone_prefix parse_user_agent parse_url cron_next_runs convert_time get_public_holidays count_or_add_business_days convert_units convert_color_check_contrast check_wcag_contrast geocode make_qr_code make_barcode read_qr_barcode peppol_lookup lint_x402_listing check_header_budget build_ics_event parse_ics expand_rrule decode_jwt verify_jwt decode_lightning_invoice decode_nostr_id get_gpu_prices get_gpu_price_index upload_file_get_link find_places_nearby lookup_barcode_product render_mermaid search_datasets
Run this server? Show the check in your README
The badge reflects the latest weekly read: 
[](https://lazaretto.dev/mcp-registry/dev-tanod-util)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.