2026-01 monthly summary for the elixir-lang/expert repository, focusing on key accomplishments, impact, and technical capabilities demonstrated. The primary work centered on making LSP path discovery robust in constrained environments and removing reliance on login shell behavior within development containers to improve reliability and developer experience.

July 2025 focused on strengthening the reliability and predictability of the Elixir formatter by adding strict input validation and robust error handling. The key change enforces that the :deps_paths option used by formatter_for_file/2 must be a map, and raises a clear error when it is not. This reduces runtime formatting errors, improves developer experience, and lowers CI risk by catching misconfigurations early.