Anthropic SDK v0.123.0

v0.123.0, released on 2026-08-18, adds API updates for files, memory stores, skill, and user profiles, plus client helpers for reading workspace ID response headers. Notable fixes include removing unsupported mid-conversation system content blocks, avoiding subprocesses when computing platform headers, exporting several errors at the package root, and making session-tool execution and tool-result retries more robust.

0.123.0 (2026-08-18) Full Changelog: v0.122.0...v0.123.0 Features api: additions to files and memory stores ( 09ce187 ) api: updates to skill, files, and user profiles ( c6cbffd ) client: add helpers for accessing the workspace ID in response headers ( f79882b ) Bug Fixes api: remove unsupported mid_conv_system content block ( 6f15b8d ) client: compute platform headers without spawning a subprocess ( baca9f4 ) client: export custom status errors from _exceptions. all ( #459 ) ( 2950ec4 ) client: export ServiceUnavailableError and DeadlineExceededError from the package root ( #468 ) ( 0dcd06d ) session-runner: retry tool-result sends for at least the lease TTL ( #453 ) ( e1a4891 ) tools: run synchronous session tools in a worker thread ( #399 ) ( 8f88c57 ) Chores examples: remove legacy Text Completions API examples ( cf5c768 ) internal: remove leftover prism references ( 826ba7a )