Thomas Coudray developed a targeted security safeguard for the LedgerHQ/actions repository, addressing a supply chain incident within the CI pipeline. He introduced a kill switch mechanism in the GitHub Actions workflow, temporarily disabling Spectral CLI installation to contain the incident and minimize risk. This solution was implemented using JavaScript and YAML, leveraging CI/CD and DevOps best practices to ensure rapid response and maintain workflow stability. The approach emphasized security management by enabling controlled reactivation and providing clear rollback paths. All changes were made with explicit, auditable commits, supporting post-incident analysis and preserving the integrity of the continuous integration process.