Breaking Changes
Nexus - Deprecate API removed
Some Nexus APIs previously deprecated are now removed. Most notably OperationID was removed, users should switch to OperationToken .
Highlights
Nexus Operation Cancellation Types (Pre-release)
Users can now specify the cancellation type when cancelling a Nexus operations from a workflow. This allows for more granular control over how Nexus operations are cancelled, and how the caller is notified of the cancellation.
Dynamic Workflow and Activities
Dynamic workflow and activities, which are nameless, can now be registered with RegisterDynamicWorkflow and RegisterDynamicActivity. This allows users to specify a default workflow to run if a worker does not recognize the workflow or activity being run on it.
Workflow Metadata - Local Activity Summary
Local activities now support a Summary like normal activities and child workflows.
Application Error Category
Application errors can specify a category, called ApplicationErrorCategory, to control logging and metrics behavior of activity failures
What’s Changed
2025-04-18 - 0517ec9 - Make doc comment name match code name (#1920)
2025-04-21 - a921890 - Add support for root workflow execution to workflow info (#1923)
2025-04-23 - 50118c6 - Remove old Nexus workflow run operation token format (#1927)
2025-04-25 - ee78d25 - Add application err category (#1925)
2025-04-28 - 3db4820 - Add missing lock (#1938)
2025-04-29 - f3fcc94 - Update [golang.org/x/net](http://golang.org/x/net) for CVE-2025-22872 (#1939)
2025-04-30 - 2c90009 - Fix trying to decode nil summary fields (#1941)
2025-04-30 - 4a43228 - Handle mix of RawValue and non-RawValue inputs for CompositeDataConverter (#1937)
2025-04-30 - 5a87f01 - Remove deprecated nexus APIs (#1944)
2025-04-30 - e2dfd9d - Add high level workflow describe (#1924)
2025-05-01 - 5de51a1 - Support for RequestIdReference in Link (#1877)
2025-05-02 - a10de39 - Encode the event type short string in the links (#1949)
2025-05-05 - 876aaaf - Remove per-file copyright headers (#1950)
2025-05-06 - 6d2cb6a - Implement Nexus operation cancellation types (#1917)
2025-05-07 - 52c7523 - Set Nexus links in the callback (#1945)
2025-05-08 - 46420c2 - Handle links from ExecuteWorkflow in Nexus WorkflowRunOperation (#1934)
2025-05-15 - b13a953 - Add SearchAttributes.Copy exception to workflowcheck (#1958)
2025-05-16 - f55d382 - Dynamic workflows and activities (#1946)
2025-05-27 - 71ce2dc - fix comments and grammar (#1959)
2025-05-28 - df05d05 - Mark Nexus operation cancellation type as Experimental. (#1960)
2025-05-30 - 22952b3 - Don't heartbeat local activity on non-graceful worker shutdown (#1933)
2025-06-03 - b955aa8 - Improve docs on NexusOperationCancellationTypeTryCancel (#1964)
2025-06-04 - 9de36a9 - Handle activity cancel due to worker shutdown properly (#1910)
2025-06-04 - a15c294 - 💥 [Breaking] Update versioning APIs to use struct (#1962)
2025-06-05 - f3b6fd4 - Use system time as started time (#1952)
2025-06-09 - 918fea8 - Fix missed spot w/ versioning string (#1969)
2025-06-10 - 28be770 - Deprecate versioning intents (#1970)
2025-06-10 - 2fb80f2 - Enable SDKFlagBlockedSelectorSignalReceive by default (#1762)
2025-06-17 - 46d0b10 - Stop Nexus worker. (#1974)
2025-06-18 - 4a4b322 - Deprecate more old versioning APIs (#1979)
2025-06-20 - 9682a69 - fix a typo (#1981)
2025-06-22 - a569259 - Clarify WithTags behaviour in metrics handler (#1975)
2025-06-25 - a1a14b9 - Fix GetWorkerStopChannel() for Local Activities (#1965)
2025-07-03 - 5be3364 - Plumb Summary through LocalActivityOptions (#1987)
2025-07-03 - f7174c2 - Fix TestActivityPause for Temporal Server v1.28.0 (#1989)
2025-07-04 - 8ee3a8a - Expose StartToCloseTimeout in ActivityInfo struct (#1990)
2025-07-07 - 4736849 - Release Go SDK v1.35.0
2025-07-07 - d68db26 - Apply context to data converter in update (#1991)