Claudio improved the reliability of MCP fingerprinting in the google/tsunami-security-scanner-plugins repository by refining backend logic to reduce false positives and enhance detection accuracy across diverse MCP server configurations. He introduced the use of the Accept header in Java-based requests and implemented logic to prevent 406 Not Acceptable responses from triggering incorrect MCP detection. Claudio also developed comprehensive unit and regression tests to verify behavior with JSON-RPC error bodies, ensuring future stability. His work focused on backend development and unit testing, delivering measurable business value by making MCP detection more robust and maintainable within the existing Java codebase.