AI Shield M99 vs Promptfoo MCP Proxy: Side-by-Side Comparison (2026)

AI Shield M99: AI agent kill switch with 6-level graduated response and 7-layer termination. built by Red Specter Security. Core capabilities include 6-level graduated response system with auto-escalation timers, 5-phase kill sequence across 7 infrastructure layers, Signal Skip for critical threats bypassing lower response levels..

Promptfoo MCP Proxy: Proxy layer for controlling and monitoring MCP server access in AI apps. built by Promptfoo. Core capabilities include MCP server whitelisting to block unapproved servers, Granular access control per user and application, Real-time monitoring of MCP interactions..

Both serve the Agentic AI Security market but differ in approach, feature depth, and target audience.

AI Shield M99 differentiates with 6-level graduated response system with auto-escalation timers, 5-phase kill sequence across 7 infrastructure layers, Signal Skip for critical threats bypassing lower response levels. Promptfoo MCP Proxy differentiates with MCP server whitelisting to block unapproved servers, Granular access control per user and application, Real-time monitoring of MCP interactions.

AI Shield M99 is developed by Red Specter Security. Promptfoo MCP Proxy is developed by Promptfoo. Vendor maturity, funding stage, and team size can be important factors when evaluating long-term viability and support quality.

AI Shield M99 and Promptfoo MCP Proxy serve similar Agentic AI Security use cases: both are Agentic AI Security tools, both cover Agentic AI Security. Review the feature comparison above to determine which fits your requirements.