2.257.0 (2026-07-28) Features experiments: colour lift by metric direction (#8099) (0668c09) Bug Fixes api: OAuth dynamic client registration fails for Claude Desktop (#8114) (aecbbb6) Performance Improvements SDK: Decouple SDK identity request cost from version history (#8096) (bea1512) Refactoring code-help: escape snippets centrally instead of in source strings (#8062) (4d5fff8)