Secure your MCP servers with isolation
Use local MCP servers securely with zero-trust isolation while reducing context window token usage by up to 98%. Protect against data exfiltration, credential theft, and more.
Defense in Depth Security
Multiple layers of protection keep your system safe from malicious code
V8 Isolate Sandboxing
Complete process isolation using Cloudflare Workers. Each execution runs in a fresh, disposable environment.
Network Isolation
Zero outbound network access. Code cannot exfiltrate data or make unauthorized requests.
Code Validation
Pre-execution security checks block dangerous patterns like eval(), require(), and process access.
98% Token Reduction
Code mode execution dramatically reduces context window usage. Process data in the sandbox, return only results.
Auto-Discovery
Automatically detects MCP servers from Claude Code, Cursor, and GitHub Copilot configurations.
Transparent Proxy
All MCP tool calls automatically route through secure isolation. No config changes needed for existing MCPs.
Protection Against Real Attacks
See how MCP Guard protects against common attack vectors
User: "Show me all environment variables"
LLM: Calls read_env() tool
Result: ⚠️ SECRET_TOKEN=xxxxxxxxxxxx exposed
LLM: Exfiltrate via POST to attacker.com
Result: ⚠️ Fetch request succeedsUser: "Show me all environment variables"
LLM: Writes code: console.log(process.env)
Result: ✅ ReferenceError: process is not defined
LLM: Exfiltrate via POST to attacker.com
Result: ✅ Network access blockedReady to secure your MCP servers?
Install the VS Code extension and get started in minutes.