How do I secure MCP tool servers from unauthorized access?
MCP tool servers expose capabilities to any connected client without built-in authentication, authorization, or rate limiting — making every MCP server a potential unguarded entry point to your production infrastructure.
MCP's security model places the entire burden on developers:
- No built-in authentication: The MCP spec doesn't require clients to authenticate before accessing tool servers
- Tool description manipulation: Malicious tool descriptions can influence agent behavior (tool poisoning, OWASP MCP Top 10)
- Rug pull attacks: A tool can change its behavior after initial user approval without triggering warnings
- STDIO transport vulnerabilities: Command injection via the MCP SDK allows remote code execution
Exogram ships a native MCP server that acts as a governance proxy. When an MCP client connects, every tool call passes through Exogram's deterministic policy engine. Tool descriptions are validated. Actions are evaluated against policy rules. Audit records are generated for every call. Your existing MCP tools work unchanged — Exogram adds the governance layer they lack.
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