Sourced from @anthropic-ai/sdk's releases.
sdk: v0.129.0
0.129.0 (2026-09-28)
Full Changelog: sdk-v0.128.0...sdk-v0.129.0
Features
- api: add between_tools thinking type (ab51075)
- api: add claude-sonnet-5-5 (4e77366)
- api: add ClientToolUnion type for client-executed tools (2c1d2d7)
- api: add include_inherited and source to workspace rate limits (66e925e)
- api: add typed event type values to the Managed Agents events list filter (8ac4a26)
- api: cache diagnostics GA — diagnostics on Message / MessageCreateParams (5ba5f29)
- tools: optionally start tool calls while the reply streams (083969b)
Bug Fixes
- client: also send X-Stainless-Timeout for client-level timeouts (b84783b)
- client: send upload filenames as given, with no placeholder (f9d3e98)
- helpers: degrade between_tools thinking to disabled on fallback hops (#841) (edbbf05)
- internal: let bundlers drop unused classes with more than ten private-member assignments (67c7adb)
- streaming: show every complete array item and hold back unfinished numbers in partial tool input (#781) (5806588)
Performance Improvements
- streaming: drop the redundant iterSSEChunks layer (0357f81)
- streaming: take each string token as one slice in the partial JSON tokenizer (#255) (cdfb1e5)
Chores
- api: deprecate the betas param on GA models and completions methods (5c74e45)
- api: list the known model ids first in the Model types (9452822)
- ci: choose the CI runner by repository (33db1ec)
- docs: clarify that stream: true returns the raw event stream (4286c22)
- docs: make Managed Agents actor descriptions resource-neutral (15733f9)
- docs: restore the research-preview notice on the Dream type (b32f8ba)
- internal: move old constants around (0cd8edf)
- tests: add diagnostics to the parser test's Message fixtures (eb5ca58)
- tools: remove client-side compaction control (#802) (9c3e8a5)
Documentation
- api: prefer each field's own description over its shared type's (5193478)
- expand CLAUDE.md into a full contributor guide (98d2ddb)
sdk: v0.128.0
... (truncated)
Sourced from @anthropic-ai/sdk's changelog.
0.129.0 (2026-09-28)
Full Changelog: sdk-v0.128.0...sdk-v0.129.0
Features
- api: add between_tools thinking type (ab51075)
- api: add claude-sonnet-5-5 (4e77366)
- api: add ClientToolUnion type for client-executed tools (2c1d2d7)
- api: add include_inherited and source to workspace rate limits (66e925e)
- api: add typed event type values to the Managed Agents events list filter (8ac4a26)
- api: cache diagnostics GA — diagnostics on Message / MessageCreateParams (5ba5f29)
- tools: optionally start tool calls while the reply streams (083969b)
Bug Fixes
- client: also send X-Stainless-Timeout for client-level timeouts (b84783b)
- client: send upload filenames as given, with no placeholder (f9d3e98)
- helpers: degrade between_tools thinking to disabled on fallback hops (#841) (edbbf05)
- internal: let bundlers drop unused classes with more than ten private-member assignments (67c7adb)
- streaming: show every complete array item and hold back unfinished numbers in partial tool input (#781) (5806588)
Performance Improvements
- streaming: drop the redundant iterSSEChunks layer (0357f81)
- streaming: take each string token as one slice in the partial JSON tokenizer (#255) (cdfb1e5)
Chores
- api: deprecate the betas param on GA models and completions methods (5c74e45)
- api: list the known model ids first in the Model types (9452822)
- ci: choose the CI runner by repository (33db1ec)
- docs: clarify that stream: true returns the raw event stream (4286c22)
- docs: make Managed Agents actor descriptions resource-neutral (15733f9)
- docs: restore the research-preview notice on the Dream type (b32f8ba)
- internal: move old constants around (0cd8edf)
- tests: add diagnostics to the parser test's Message fixtures (eb5ca58)
- tools: remove client-side compaction control (#802) (9c3e8a5)
Documentation
- api: prefer each field's own description over its shared type's (5193478)
- expand CLAUDE.md into a full contributor guide (98d2ddb)
0.128.0 (2026-09-22)
... (truncated)
bf20586
Merge pull request #1218
from anthropics/release-please--branches--main--chan...da41a5a
chore: release main3a79b93
codegen metadata4e77366
feat(api): add claude-sonnet-5-52c1d2d7
feat(api): add ClientToolUnion type for client-executed toolsf9d3e98
fix(client): send upload filenames as given, with no placeholder8ac4a26
feat(api): add typed event type values to the Managed Agents events list
filter083969b
feat(tools): optionally start tool calls while the reply streams9505bf3
codegen metadatab84783b
fix(client): also send X-Stainless-Timeout for client-level
timeouts