April 2026: Focused on documentation accuracy in the erlang/otp repository. Corrected the List Filtering Expression output to reflect actual behavior, ensuring the reference manual matches implementation and reducing user confusion. No code changes were required; this improvement strengthens documentation quality, onboarding, and user trust.

August 2025 monthly summary for typelevel/cats-mtl focusing on delivering clearer error handling guidance for Raise's implicitNotFound and improved ergonomics. Updated the implicitNotFound message to suggest using Handle.allowF to handle errors of type E when an implicit Raise instance is not found, reducing ambiguity and enabling more idiomatic error handling in effectful code. This change speeds up adoption, decreases debugging time, and enhances library reliability for downstream users.