Agen Shield vs KeyRunner: Side-by-Side Comparison (2026)

Agen Shield: Endpoint & browser enforcement layer blocking dangerous AI agent actions pre-execution. built by Agen.co. Core capabilities include On-device pre-execution blocking of out-of-policy AI agent actions, Browser paste detection and blocking of sensitive data into AI tools, Unified policy plane shared across device, browser, and gateway enforcement..

KeyRunner: Governed runtime securing AI agent API calls with credential injection & PII redaction. built by KeyRunner. Core capabilities include Pre-execution policy enforcement with RBAC before every API call, Runtime credential injection from external vaults without exposing secrets to agents, PII, PHI, and card data redaction from API responses before reaching the agent..

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

Agen Shield differentiates with On-device pre-execution blocking of out-of-policy AI agent actions, Browser paste detection and blocking of sensitive data into AI tools, Unified policy plane shared across device, browser, and gateway enforcement. KeyRunner differentiates with Pre-execution policy enforcement with RBAC before every API call, Runtime credential injection from external vaults without exposing secrets to agents, PII, PHI, and card data redaction from API responses before reaching the agent.

Agen Shield is developed by Agen.co. KeyRunner is developed by KeyRunner. Vendor maturity, funding stage, and team size can be important factors when evaluating long-term viability and support quality.

Agen Shield integrates with MDM (Mobile Device Management). KeyRunner integrates with Claude, ChatGPT, Cursor, HashiCorp Vault, 1Password and 10 more. Check integration compatibility with your existing security stack before deciding.

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