Kastell

Kastell is an MCP-compatible server that enables AI assistants like Claude, Cursor, and other MCP clients to provision, audit, harden, and manage Linux servers across multiple cloud providers. It exposes a full suite of tools: security auditing (over 450+ checks), automated remediation, server hardening (firewall, SSH, fail2ban, SSL), lifecycle management (deployment, backup, restore, monitoring), multi-server fleet management, and cloud provisioning (supported providers include Hetzner, DigitalOcean, Vultr, Linode). Kastell is targeted at DevOps professionals, infrastructure engineers, security teams, and anyone needing robust, automated, and AI-driven server management for self-hosted environments.