MCP Security Hardening
Security controls and rollout practices for safely operating MCP connectors.
MCP connectors increase analytical value and operational risk at the same time. Use this checklist to ship connector access safely.
Hardening Controls
Authentication and Authorization
- Use service accounts with least-privilege scopes.
- Separate read-only and write-capable credentials.
- Rotate secrets on a fixed schedule.
- Disable stale credentials during offboarding.
Network and Host Restrictions
- Allowlist connector destinations explicitly.
- Enforce TLS and reject insecure endpoints.
- Restrict egress paths for connector services.
Query Guardrails
- Block broad wildcard queries by default.
- Require bounded time ranges for high-volume sources.
- Apply response size limits to prevent noisy dumps.
Rollout Phases
- Pilot with one connector and one small analyst group.
- Validate query accuracy, latency, and failure modes.
- Add alerting for auth failures and error spikes.
- Expand scope only after two stable review cycles.
Ongoing Audit Questions
- Which connectors are unused and should be disabled?
- Are any teams using broader permissions than required?
- Do logs show repeated failed queries that indicate misuse?
Default-deny posture
Treat every new connector as untrusted until it passes logging, scope, and operational stability checks.