Guilhermo worked on the gchq/CyberChef repository, focusing on improving the JWT verification user experience and documentation. He addressed a documentation issue in the JWTVerify operation by correcting a typo and clarifying that a public key, rather than a private key, should be used for RSA and ECDSA JWT verification. This change enhanced the accuracy of user guidance and reduced the risk of configuration errors. His work involved code correction and technical writing, utilizing JavaScript and documentation best practices. Over the month, Guilhermo’s contribution was targeted and precise, addressing a critical detail to improve security posture and developer usability.