February 2026 monthly summary for golang/tools and golang/go focusing on reliability improvements, test stability, and compiler robustness. Key features delivered: Gopls integration test stabilization in golang/tools, replacing nested subtests with a plain loop to prevent panics and timeouts in the integration suite. Major bugs fixed: 1) Modernizer stability enhancements to skip function literals with return values and to avoid applying string-slicing transformations when the index is negative, preventing compilation errors; 2) Internal compiler crash fix by ignoring zero-sized arrays in critical processing paths (cmd/compile). Overall impact: Reduced CI flakiness, safer and more predictable modernization passes, and more robust compiler behavior, enabling faster development cycles and fewer regressions. Technologies/skills demonstrated: Go tooling and tooling integration, test harness stabilization, static analysis improvements, cross-repo collaboration, and careful handling of edge cases in concurrent code and compiler internals.