FAQ from MCP Defender
What is MCP Defender?
MCP Defender is a purpose-built desktop security agent that delivers real-time, protocol-aware protection for AI applications leveraging the Model Context Protocol. It functions as an intelligent, low-latency proxy — inspecting, validating, and optionally blocking MCP tool calls and responses using a hybrid detection engine combining signature matching, behavioral anomaly scoring, and LLM-guided contextual analysis.
Which AI security threats does MCP Defender detect in real time?
It detects and mitigates advanced threats unique to AI agent architectures — including context-hijacking prompt injections, stealthy credential harvesting via output parsing, unauthorized filesystem access through tool abuse, remote command injection disguised as legitimate function parameters, and lateral movement attempts across MCP-connected services.
What AI applications and editors does MCP Defender support?
Out-of-the-box support includes Cursor, Claude Desktop, Visual Studio Code (with MCP-compatible extensions), and Windsurf. Support for JetBrains IDEs, Obsidian plugins, and custom MCP clients is actively in development — with full SDK documentation available for third-party integrations.
Is MCP Defender open source? Where can I review or contribute?
Yes — MCP Defender is fully open source under the MIT License. The complete codebase, threat signature definitions, documentation, and contribution guidelines are hosted transparently on GitHub: github.com/MCP-Defender/MCP-Defender.
How does MCP Defender enforce security without breaking AI functionality?
By operating at the MCP transport layer — not the application or model level — MCP Defender preserves full AI capability while adding guardrails. It validates *intent* and *context*, not just syntax; allows granular policy controls per tool or domain; and offers safe “sandbox mode” for testing untrusted plugins — ensuring zero false-positive disruption to legitimate development workflows.