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Have I Been Pwned
io.github.troyhunt/hibp in the official MCP registry.
Endpoint https://haveibeenpwned.com/mcp.
The registry describes it as: Breach intelligence API: email search, domain monitoring, passwords and stealer logs.
We read its 17 tools on 2026-10-22. 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
hibp_list_breaches hibp_get_breach hibp_get_latest_breach hibp_list_data_classes hibp_get_pwned_passwords_range hibp_get_breached_account hibp_get_breached_account_range hibp_get_paste_account hibp_get_breached_domain hibp_list_subscribed_domains hibp_get_subscription_status hibp_get_stealer_logs_by_email hibp_get_stealer_logs_by_website_domain hibp_get_stealer_logs_by_email_domain hibp_generate_domain_verification_dns_token hibp_verify_domain_verification_dns_token hibp_send_domain_verification_email
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[](https://lazaretto.dev/mcp-registry/io-github-troyhunt-hibp)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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