MCP servers tagged fail-closed

4 live MCP servers tagged "fail-closed", ranked by trust score. Tags come from package metadata and repository topics, so this list covers servers across every category that work with fail-closed.

live servers

avg trust

Vetto

Daemon-less OS security boundary & sandbox for AI coding agents (Codex, Claude Code, Cursor, Aider)

Cornercheck

Fail-closed fighter-clearance Slack agent: cross-jurisdiction medical suspensions, ARP return windows, tamper-evident audit ledger. Slack Agent Builder Challenge (Agent for Good).

Gate.cat

Block irreversible AI-agent actions before they run — deterministic, fail-closed action veto for Claude Code, Codex, Cursor, and other tool-using agents.

AegisAgent

Zero-trust API firewall and security integrity layer for autonomous AI agents & Model Context Protocol (MCP) tool execution. Secure, TOCTOU-proof, fail-closed.