{"id":"mcp-defender-mcp-defender","name":"MCP-Defender","af_score":30.0,"security_score":43.8,"reliability_score":27.5,"what_it_does":"MCP Defender is a desktop application that proxies MCP tool-call requests and responses from supported AI apps (e.g., Cursor, Claude, VS Code, Windsurf) through the Defender. It inspects the intercepted traffic against signature rules and prompts the user to allow or block tool calls when harmful patterns are detected.","best_when":"You run an MCP-capable AI desktop client in a local environment and want an interactive prompt/guardrail for tool-calling based on signature inspection.","avoid_when":"You need a headless, server-based, fully automated policy enforcement system without user interaction or auditing; or you require a documented, stable programmatic API for integration into other systems.","last_evaluated":"2026-03-30T13:35:37.333323+00:00","has_mcp":false,"has_api":false,"auth_methods":[],"has_free_tier":false,"known_gotchas":["This appears to be a desktop proxy application rather than a standard API/MCP server exposed for agent-to-agent integration, so agents may not have a clean machine interface to control policies.","No documentation was provided here about how Defender surfaces decisions/events programmatically (e.g., logs, callbacks, CLI) or how it behaves under network/proxy failures.","Signature-based detection can produce false positives/negatives; without documented policy controls, automation strategies may be limited."],"error_quality":0.0}