MCP Multiplies Attack Surface
Model Context Protocol lets agents call filesystem tools, databases, and SaaS APIs through a standard interface. That standardization is powerful — and dangerous. Every MCP server you connect is a new trust boundary.
Without a gateway, agents talk directly to upstream servers. A compromised agent, malicious prompt, or poisoned tool manifest can exfiltrate data or mutate production systems with no independent review.
What a Policy Gateway Adds
An MCP policy gateway sits between clients and upstream servers. It:
- Authenticates agent identity on every
tools/call - Pins tool manifest hashes to detect drift
- Intercepts calls and runs them through a formal policy engine
- Blocks SSRF targets before evaluation
- Records every decision in an audit chain
ActantOS implements this today in the Week 1 MVP. Configure clients to route through ActantOS instead of connecting directly.
Fail-Closed Is the Default
If the gateway is unreachable, adapters must hard-fail. No silent fallback to direct upstream access. That is the difference between governance theater and runtime enforcement.
Next steps: Run the early MVP locally or read the integrations guide.