MCP Security Assessment &
Tool Poisoning Defense.
The Model Context Protocol (MCP) standardizes how AI models connect to data sources, developer tools, and enterprise APIs. Navira Security audits your client-server MCP implementations to eliminate tool poisoning, insecure schema definitions, unauthorized parameter injection, and untrusted JSON-RPC execution.
"Can an adversary manipulate tool schemas or parameter values across an MCP connection to execute unauthorized actions on backend infrastructure?"
What We Audit in an MCP Security Assessment
We perform deep inspection across both client-side and server-side Model Context Protocol implementations:
Tool Definition Poisoning
Auditing tool manifests for hidden prompt directives, adversarial instruction overrides, and privilege escalation traps.
Parameter Schema Validation
Testing JSON-RPC input parsing against injection attacks (SQL, command injection, path traversal) via unconstrained parameters.
Client-Server Authentication & Scoping
Reviewing mutual TLS, token delegation, and permission boundaries between AI orchestrators and local/remote MCP servers.
Sandbox Isolation & Side Effects
Testing container boundaries and filesystem isolation to prevent rogue tools from escaping into host environments.
Shadow MCP Server Discovery
Identifying unmanaged developer MCP endpoints, unauthenticated local sockets, and undocumented tool capabilities.
Human-in-the-Loop Confirmation
Verifying that high-impact MCP tool invocations (fund transfers, data modification) enforce deterministic user MFA signatures.
Engineering Deliverables for MCP Security
Every engagement produces reproducible test harnesses and hardened proxy code:
Engagement Parameters
Lab 003: Model Context Protocol (MCP) Security & Hardening Guide
Read our open research on MCP trust boundaries, tool poisoning mechanics, and python proxy implementation.
Scope Your AI Security Engagement
Configure your production AI architecture to calculate recommended testing depth, duration, and Founding Deal pricing.