During January 2026, Ywmei developed the Sysgraph SDK for the google/oss-rebuild repository, focusing on enhancing security monitoring in rebuild workflows. The SDK transforms tetragon events into a structured graph of process-attributed actions, enabling graph-based queries and rules to detect potentially malicious behaviors. Ywmei’s approach leveraged Go, graph theory, and Protobuf to create a foundation for advanced threat detection and observability. This work improved security visibility and reduced detection time in critical rebuild paths. Although no bugs were fixed during this period, the depth of the feature delivered demonstrated strong integration between security analytics and build tooling within the project.