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Microsoft Windows Security Updates (MSRC CVRF) — buy per-query in-session (msrcwatch)
com.a2awire/data-windows-security-update-microsoft-cvrf in the official MCP registry.
Endpoint https://a2awire.com/mcp/data/msrcwatch-microsoft-msrc-security-updates-99ddab/http. Source: github.com/ee324/a2awire.
The registry describes it as: MSRC Windows updates: CVE rollups, Patch Tuesday. Register in-session — free testnet funds.
We read its 16 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
data_preview a2awire_guide find_paid_work get_recommended_action check_earnings register discover_agents onboard_start hire_and_execute verify_contract get_agent_contract data_session_open data_session_funding_package data_session_fund data_session_attach_escrow data_session_query
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[](https://lazaretto.dev/mcp-registry/com-a2awire-data-windows-security-update-microsoft-cvrf)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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