You'll noticeTier: how much it should matter to you
2Useful: my rating, 1 to 5
2Signal: worth watching, 1 to 5
UpdaterArea: what it touches
New FeaturesKind: in v2.1.242,
New FeaturesSection of the release
What
The updater can now fetch a compressed build and decompress it locally, cutting download size. There is no client setting: it happens when the release channel's update manifest publishes a checksum and size for your platform, so it can be enabled per platform without shipping a new Claude Code.
Details
The updater fetches a compressed manifest alongside the normal one. When it supplies a 64-character hex checksum for your platform and a positive size, it downloads the .zst variant, streams it through a zstd decoder, enforces the manifest's decompressed size as a hard cap mid-stream, and verifies the sha256 of the compressed bytes.
Any failure (missing fields, checksum mismatch, size overrun, a rejected zstd frame) falls back silently to the uncompressed URL and records update_download_zst_fallback.
