Silent Failures: Why MCP Agents Log Success While Tasks Never Execute

MCP agents face a critical vulnerability where tasks fail silently while logging indicates success, caused by protocol-layer mismatches between HTTP status codes and JSON-RPC responses. Three common failure patterns—null result propagation, retry masking, and schema drift—can go undetected by standard error-checking, leading to untraced data loss. Vouqis, a proxy solution, addresses this by intercepting and validating both layers with structured audit logging to expose hidden failures.