1.26.1

Fix for worker shutdown ordering

There was an issue with worker shutdown when the frontend.enableCancelWorkerPollsOnShutdown dynamic config flag is enabled on server. The issue was causing shutdown to stall until the full 30s worker shutdown timeout was hit, as server was waiting for a message that the SDK was not sending. This fixes the SDK to send the proper message, allowing shutdown to occur normally.

What's Changed

• [backport 1.26.1] Update core to pickup shutdown fix by @yuandrew in #1527

Full Changelog: 1.26.0...1.26.1

1.25.1

Fix for worker shutdown ordering

There was an issue with worker shutdown when the frontend.enableCancelWorkerPollsOnShutdown dynamic config flag is enabled on server. The issue was causing shutdown to stall until the full 30s worker shutdown timeout was hit, as server was waiting for a message that the SDK was not sending. This fixes the SDK to send the proper message, allowing shutdown to occur normally.

What's Changed

• [backport 1.25.1] Update core to pickup shutdown fix by @yuandrew in #1526

Full Changelog: 1.25.0...1.25.1

1.24.2

Bug Fixes

• Removed upper bound constraint on types-protobuf dependency (#1525). The previous ceiling (<5.29.1) could cause dependency conflicts for users on newer types-protobuf versions. The constraint now matches the protobuf range (>=3.20,<7.0.0).

What's Changed

• [backport] Remove ceiling for types-protobuf by @yuandrew in #1525

Full Changelog: 1.24.1...1.24.2

1.27.2

DNS Resolver Load Balancing Configuration

A new load balancing feature was added in temporalio/sdk-rust#1212 which has caused networking issues in certain networking setups. This is now disabled by default via the change listed below.

What's Changed

• Default DNS lb config to None by @THardy98 in #1518

1.27.1

DNS Resolver Load Balancing Configuration

A new load balancing feature was added in temporalio/sdk-rust#1212 which has caused networking issues in certain networking setups. That can now be disabled via DnsLoadBalancingConfig.

What's Changed

• Fix flaky pause_and_assert helper by @brianstrauch in #1493
• Fix flaky LangGraph timeout tests by @DABH in #1495
• feat(otel): remove span creation for saa operations that do not currently propagate tracing headers. by @cconstable in #1492
• CaN USE_RAMPING_VERSION versioning behaviour by @THardy98 in #1499
• Say 'client_region' in S3 diagnostics for clarity by @drewhoskins-temporal in #1494
• contrib/openai_agents: stream model events via Workflow Streams by @jssmith in #1497
• contrib/google_adk_agents: stream LlmResponse chunks via Workflow Streams by @jssmith in #1498
• Fix CI, bump openinference-instrumentation-google-adk to 0.1.11 by @brianstrauch in #1508
• AI-183: Respect LANGSMITH_TRACING env var in LangSmith plugin by @xumaple in #1509
• Fix minor API break from latest OpenAI Agents version by @tconley1428 in #1511
• Plumb through option for configuring DNS resolver by @Sushisource in #1501

Core Changes

None!

1.24.1

Fix for worker shutdown ordering

There was an issue with worker shutdown when the frontend.enableCancelWorkerPollsOnShutdown dynamic config flag is enabled on server. The issue was causing shutdown to stall until the full 30s worker shutdown timeout was hit, as server was waiting for a message that the SDK was not sending. This fixes the SDK to send the proper message, allowing shutdown to occur normally.

What's Changed

• Pick up shutdown fix cherry-pick for v1.24.0 by @yuandrew in #1516

Full Changelog: 1.24.0...1.24.1

1.27.0

💥 External Storage Reference Format Change (Experimental)

External storage reference event history format has been incompatibly changed from prerelease. New storage references are emitted in the new format starting with release. Support for the ability to retrieve references in the old format has been preserved. The prerelease format is deprecated and will be removed in a future release.

Workflow Streams

This release adds Workflow Streams, a public preview contrib library that gives a workflow a durable, offset-addressed event channel for keeping outside observers updated on workflow and activity progress. It's built on Temporal's existing signals, updates, and queries, with batching, exactly-once deduplication, topic filtering, and continue-as-new helpers layered on top. Intended uses are streaming UIs for long-running AI agents, status for in-flight payment or order processing, and progress for data pipelines. It is not for not ultra-low-latency cases like real-time voice.

What's Changed

• Harden flaky workflow tests by @tconley1428 in #1456
• Pin GitHub Actions and cap uv deps by @tconley1428 in #1458
• Implement is_running() for asyncio loop by @brianstrauch in #1463
• chore: Update and pin all GHA actions by @mjameswh in #1464
• Fix flaky OpenAI test timeouts by @DABH in #1466
• AI-60: Add summary_fn parameter to TemporalModel for dynamic activity summaries by @xumaple in #1451
• Add OTel tracing for standalone activities by @cconstable in #1471
• More TMPRL1104 logging details by @jmaeagle99 in #1469
• Fix external storage CaN test stability by @jmaeagle99 in #1454
• Fix race condition in test_update_payload_conversion by @brianstrauch in #1473
• Fix race condition in test_async_response by @brianstrauch in #1474
• Fix race condition in test_cancellation_type for TRY_CANCEL by @brianstrauch in #1475
• Extend Workflow timeout for test_customer_service_workflow by @brianstrauch in #1476
• Update sdk-core submodule to latest by @jmaeagle99 in #1481
• Add AI Foundations as CODEOWNERs of AI plugins by @donald-pinckney in #1482
• chore: update submodule to sdk-rust by @chris-olszewski in #1480
• AI-36: Add LangGraph plugin by @brianstrauch in #1448
• 💥 Use ExternalStorageReference protobuf message for payload references by @jmaeagle99 in #1486
• External storage: Improved debuggability for region problems. by @drewhoskins-temporal in #1487
• Add start_delay for SAA by @Sushisource in #1491
• Update Python and Cargo lockfiles by @tconley1428 in #1483
• Add Workflow Streams library by @jssmith in #1423

Core Changes

2026-04-10 - 08adc4a4 - feat(sdk): add typed continue as new (temporalio/sdk-rust#1209)
2026-04-14 - 00d3888a - feat(client): ergonomic workflow description (temporalio/sdk-rust#1215)
2026-04-14 - c78bfb67 - Support static_summary, static_details and current_details` in the Rust sdk (temporalio/sdk-rust#1208)
2026-04-14 - d24a6f77 - chore(ci): bump macos-intel timeout (temporalio/sdk-rust#1214)
2026-04-15 - d7ebff81 - Add DNS load balancing (temporalio/sdk-rust#1212)
2026-04-16 - 33b86805 - fix(sdk): normalize how user metadata is encoded (temporalio/sdk-rust#1216)
2026-04-16 - 33c6c5e2 - Optimize dependencies (temporalio/sdk-rust#1219)
2026-04-16 - 72d8c5d3 - Fix test broken on windows by fake server binding to ipv6 (temporalio/sdk-rust#1220)
2026-04-16 - 904f4793 - Remove unused parking lot send guard feature (temporalio/sdk-rust#1218)
2026-04-17 - 1e67b234 - chore: Update and pin all GHA actions (temporalio/sdk-rust#1222)
2026-04-20 - 9171aca4 - 💥 feat(sdk): enforce some activity to close timeout is set (temporalio/sdk-rust#1221)
2026-04-21 - 703fe6b2 - Fix NDE when multiple patches in a single WFT exceed SA's 2048-byte limit (temporalio/sdk-rust#1225)
2026-04-22 - 984da134 - Set WFT Failed cause on grpc message too large incidents (temporalio/sdk-rust#1229)
2026-04-23 - 64cb6ed2 - Shutdown rpc initiate shutdown (temporalio/sdk-rust#1224)
2026-04-24 - 6dd29f2d - chore: rename master -> main in docs/crates/workflows (temporalio/sdk-rust#1233)
2026-04-25 - 30c4a313 - bump versions to 0.3.0 (temporalio/sdk-rust#1235)
2026-04-26 - 2872b536 - Update upstream api to latest (temporalio/sdk-rust#1234)

New Contributors

• @brianstrauch made their first contribution in #1463
• @DABH made their first contribution in #1466
• @cconstable made their first contribution in #1471

Full Changelog: 1.26.0...1.27.0

1.26.0

OpenAI Agents SDK Sandbox Support

This release adds support for the OpenAI Agents SDK's SandboxAgent in Temporal workflows. All sandbox lifecycle and I/O operations (create, exec, read, write, PTY, etc.) are automatically routed through Temporal activities, making them durable and replayable. If an agent fails mid-execution, Temporal ensures it picks up right where it left off in its sandbox. To use it, pass sandbox clients (e.g. DaytonaSandboxClient) to OpenAIAgentsPlugin(sandbox_clients=...). This release also updates compatibility with the latest OpenAI Agents SDK.

Breaking Changes

2026-04-09 - 4f05fc58 - 💥 Record task latency even for WFT failures that were dropped (temporalio/sdk-rust#1207) - The temporal_workflow_task_execution_latency metric is slightly more inclusive than it was in the past, and it can now include some WFT failures that may previously have been omitted

What's Changed

• Add LangSmith tracing plugin for Temporal workflows by @xumaple in #1369
• Add namespace to Nexus operation info by @Quinn-With-Two-Ns in #1416
• Add LiteLlm + TemporalModel integration test by @xumaple in #1431
• AI-59: Mark LangSmith plugin as experimental by @xumaple in #1441
• AI-61: Strip unset None fields from ADK plugin payloads by @xumaple in #1442
• S3 Driver: Require hash algorithm and value in claim payloads by @jmaeagle99 in #1443
• Expose Nexus Endpoint in a Nexus Operation Handler by @Quinn-With-Two-Ns in #1437
• Feat/OpenAI agents plugin sandbox support by @JasonSteving99 in #1452

Core Changes

2026-04-06 - a4fc7933 - feat(sdk): env config (temporalio/sdk-rust#1195)
2026-04-06 - ef57d63f - Correctly convert default_versioning_behavior in C bridge (temporalio/sdk-rust#1199)
2026-04-08 - 1f6cfb6c - fix(core): add in scheme port if none present (temporalio/sdk-rust#1205)
2026-04-08 - 723c2836 - feat(sdk): add samples (temporalio/sdk-rust#1190)
2026-04-08 - d96a8d2f - Move CODEOWNERS under .github/ (temporalio/sdk-rust#1198)
2026-04-09 - 630e7795 - Make sure legacy queries are failed if gRPC message too large (temporalio/sdk-rust#1206)
2026-04-10 - b544f95d - Expose Nexus Endpoint in a Nexus Operation Handler (temporalio/sdk-rust#1211)

New Contributors

• @xumaple made their first contribution in #1369

Full Changelog: 1.25.0...1.26.0

1.25.0

Pre-release Features

Serverless Lambda Workers

This release introduces a package which can be used together with upcoming changes to the Temporal server & cloud which allow you to run your worker in an AWS Lambda function which the server will invoke as-needed to process Workflow, Activity, and Nexus tasks - allowing you to do away with some of the operational burden of running a fleet of workers. Additional documentation on how to use this feature will be linked here when available.

External Storage

This release includes the external storage feature, which allows offloading payloads to an external storage system (such as Amazon S3) and passes a small reference token into Event History. This allows your workflows to avoid large payload errors and to avoid growing workflow history size too rapidly.

Amazon S3 Storage Driver

This release introduces a package which can be used with external storage to offload large payloads to S3 buckets in AWS instead of inlining them into workflow history. See Store and retrieve large payloads with Amazon S3 for more details and how to enable using this driver with external storage.

What's Changed

• Report driver types through worker heartbeat by @jmaeagle99 in #1371
• Emit workflow task duration information via logging by @jmaeagle99 in #1386
• Create cloud-specific tests by @Sushisource in #1389
• Enable options for concurrent payload visiting by @jmaeagle99 in #1344
• Fix command context awareness to apply to all of DataConverter by @jmaeagle99 in #1387
• Some fixes to the openai agents readme by @tconley1428 in #1391
• Add getattr to _ReplaySafeSpan for SDK attribute delegation by @tconley1428 in #1392
• Experimental: AWS S3 storage driver by @jmaeagle99 in #1388
• Allow external storage to run concurrently and separate from codecs by @jmaeagle99 in #1394
• Adjustments to external storage defaults by @jmaeagle99 in #1404
• Bump tar from 0.4.44 to 0.4.45 in /temporalio/bridge by @dependabot[bot] in #1383
• Update types-protobuf limit by @tconley1428 in #1409
• Update storage driver store context metadata by @jmaeagle99 in #1399
• Bump core commit to latest by @THardy98 in #1413
• Move proto check and test to separate job by @jmaeagle99 in #1412
• Minimize task creation for concurrent payload visiting by @jmaeagle99 in #1414
• Add contrib package for lambda workers by @Sushisource in #1408
• Provide standalone activity run ID to external storage by @jmaeagle99 in #1417
• Bump rustls-webpki from 0.103.4 to 0.103.10 in /temporalio/bridge by @dependabot[bot] in #1384
• Add xdist parallel test task by @tconley1428 in #1415
• Upgrade locked dependencies by @tconley1428 in #1420
• Support running ADK agents outside Temporal workflows by @tconley1428 in #1400
• Fix Google ADK activity tool argument dispatch by @tconley1428 in #1421
• docs: document OpenTelemetryConfig and PrometheusConfig fields by @4444J99 in #1385
• A couple of errata for the README regarding external storage by @eamsden in #1424
• Update README to remove local activities experimental warning by @donald-pinckney in #1334

Core Changes

2026-03-13 - a7611dd8 - Remove system.enableNexus dynamic config flag (temporalio/sdk-rust#1151)
2026-03-13 - cf7fcec5 - fix(client): retry WorkflowUpdateHandle::get_result poll (temporalio/sdk-rust#1150)
2026-03-16 - 7a6a53f7 - chore(ci): avoid caching rust on PR (temporalio/sdk-rust#1159)
2026-03-16 - a039b2d6 - feat(sdk): add schedule handle (temporalio/sdk-rust#1132)
2026-03-16 - c6b601de - Fix temporal metrics in C bridge to have temporal_ prefix (temporalio/sdk-rust#1156)
2026-03-17 - 2f9d6c8b - fix(core): avoid panic if workflow stream still up during eviction (temporalio/sdk-rust#1158)
2026-03-17 - f188eb53 - Add external storage drivers to worker heartbeat (temporalio/sdk-rust#1130)
2026-03-18 - db65dd9a - build: make otel opt-in in sdk-core (temporalio/sdk-rust#1154)
2026-03-18 - f00f7337 - Allow poller scale-down on timeout when server supports autoscaling (temporalio/sdk-rust#1164)
2026-03-18 - f384eeb5 - Fix possible NDE in valid child workflow cancel transition (temporalio/sdk-rust#1162)
2026-03-19 - a5e8f7f1 - Update cloud-api protos to v0.12.0 (temporalio/sdk-rust#1172)
2026-03-19 - ba203c64 - fix(sdk): re-poll update futures after workflow state changes (temporalio/sdk-rust#1153)
2026-03-19 - e49359b2 - chore: bump version to 0.2.0 (temporalio/sdk-rust#1169)
2026-03-23 - 4b0d7ed1 - feat(sdk): 💥 add HasWorkflowDefinition trait (temporalio/sdk-rust#1173)
2026-03-24 - 31798a48 - rust-toolchain.toml and MSRV checks in CI (temporalio/sdk-rust#1175)
2026-03-25 - 18615a7a - fix(sdk): serialize unit as no payloads or null payload (temporalio/sdk-rust#1181)
2026-03-25 - acec0e60 - Gate test-only worker telemetry helper (temporalio/sdk-rust#1176)
2026-03-26 - 21b65b87 - feat(sdk): 💥 add typed child workflow handle (temporalio/sdk-rust#1182)
2026-03-26 - 42e44a75 - feat(metrics): add UpDownCounter metric instrument type (temporalio/sdk-rust#1180)
2026-03-27 - 4508ae7d - Update deps & remove unused ones (temporalio/sdk-rust#1183)
2026-03-31 - 76f5c9e1 - fix(sdk): implement FusedFuture for wait_condition (temporalio/sdk-rust#1192)
2026-03-31 - d03d2ae2 - feat(sdk): external workflow handle (temporalio/sdk-rust#1187)
2026-04-01 - 24703da6 - Add standalone activity run id to bridge (temporalio/sdk-rust#1189)
2026-04-01 - 5e6b836c - chore(test): add eventually to latency metrics test (temporalio/sdk-rust#1193)
2026-04-02 - 71a5caa5 - Fix - provide default (empty) client config when default user config dir does not exist. Create an inner function to inject the default config path easily (temporalio/sdk-rust#1194)
2026-04-02 - b3d53ab7 - Validate deployment options and test worker with versioning off and custom build ID (temporalio/sdk-rust#1163)
2026-04-02 - ef6e73b8 - Custom async executor for workflows (temporalio/sdk-rust#1185)

New Contributors

• @4444J99 made their first contribution in #1385
• @eamsden made their first contribution in #1424

Full Changelog: 1.24.0...1.25.0

1.24.0

General Availability

• Nexus is now generally available and no longer experimental
• OpenAI Agents SDK Integration is now generally available and no longer experimental

Pre-release

• New Integration with the Google ADK for running ADK agents in Temporal Workflows. https://github.com/temporalio/sdk-python/tree/main/temporalio/contrib/google_adk_agents

Breaking Changes

💥 Add OpenTelemetry integration for OpenAI AgentsOpenAI/otel in #1286

Span/trace id generation changes in this PR, which means that AgentsSDK workflows which run on both the old version and the new version of the code may have broken span parentage.

💥 Use Temporal Failures for Nexus Error Serialization in #1336

• Nexus HandlerErrors are now serialized as Temporal Failures.
• Nexus OperationErrors are now converted to CancelledError or ApplicationError as indicated by the OperationErrorState.
• Nexus input deserialization failures now have different default retry behavior depending on what step the failure occurred on.
  • If the PayloadCodec fails to decode the payload, the error is wrapped in a retryable HandlerError with type INTERNAL.
  • If the PayloadConverter fails to convert the payload into the correct input type, the error is wrapped in a non-retryable HandlerError with type BAD_REQUEST.

What's Changed

• Add test utility to create Nexus endpoint by @Quinn-With-Two-Ns in #1279
• Add support for more timeouts to Nexus operations by @Quinn-With-Two-Ns in #1276
• [fix] Make workflow_id: str for workflow serialization context by @THardy98 in #1340
• Populate Request Deadline in Nexus Operation Contexts by @VegetarianOrc in #1277
• Fix ActivityAlreadyStartedError message by @dandavison in #1348
• Fix RetryPolicy.from_proto() pickle error with non_retryable_error_types by @tconley1428 in #1354
• Cancel Temporal timer when workflow.sleep() task is cancelled by @carlosa54 in #1352
• Stop skipping some Nexus tests on time skipping test server by @Quinn-With-Two-Ns in #1338
• Fix worker client updates not propagating to activity and Nexus workers by @tconley1428 in #1355
• Bump quinn-proto from 0.11.12 to 0.11.14 in /temporalio/bridge by @dependabot[bot] in #1357
• chore: bump core by @chris-olszewski in #1360
• Upgrade on CAN by @THardy98 in #1311
• Add Google ADK Agents integration for Temporal workflows by @tconley1428 in #1353
• Add experimental notices to ADK top level objects by @tconley1428 in #1363
• Split converter.py into submodules by @jmaeagle99 in #1365
• Validate deployment config and test worker with versioning off and custom build ID by @mjameswh in #1361
• Remove Unused HTTP Port From Tests by @VegetarianOrc in #1368
• Experimental: External Payload Storage by @jmaeagle99 in #1341
• ADK: Allow overriding summary for Agents without overriding the start to close timeout by @drewhoskins-temporal in #1370
• Update python version to 1.24.0 by @tconley1428 in #1377
• Fix wheel tests by @tconley1428 in #1379
• Remove experimental notices for Nexus by @Quinn-With-Two-Ns in #1381
• Misc ci fixes by @tconley1428 in #1380
• Remove experimental notices from openai agents except otel integration by @tconley1428 in #1382

Core SDK Updates

2026-02-18 - c781a610 - Rust SDK Prerelease ([https://github.com/temporalio/sdk-rust/pull/1101])
2026-02-18 - f16f160d - Nexus error types ([https://github.com/temporalio/sdk-rust/pull/1109])
2026-02-19 - 2014f31c - chore: prepare for initial publish ([https://github.com/temporalio/sdk-rust/pull/1120])
2026-02-19 - 21e03c28 - Fix encoding problems in heavy tests ([https://github.com/temporalio/sdk-rust/pull/1119])
2026-02-19 - a0caec42 - chore: exclude github workflows and uml from published crates ([https://github.com/temporalio/sdk-rust/pull/1121])
2026-02-19 - dc127f55 - Fix wait_condition to wake registered wakers on state_mut ([https://github.com/temporalio/sdk-rust/pull/1118])
2026-02-23 - 37d8c1a5 - chore: add test to verify wait_condition futures wake on state_mut ([https://github.com/temporalio/sdk-rust/pull/1128])
2026-02-23 - 7161ed3b - fix(sdk): provide default worker identity ([https://github.com/temporalio/sdk-rust/pull/1123])
2026-02-23 - 78a94de2 - Expose continue_as_new_suggested on WorkflowContext ([https://github.com/temporalio/sdk-rust/pull/1126])
2026-02-23 - 9d678b96 - no longer cancel pending polls on shutdown ([https://github.com/temporalio/sdk-rust/pull/1122])
2026-02-23 - f52b48bd - chore: fix flake in list workflows test ([https://github.com/temporalio/sdk-rust/pull/1124])
2026-02-25 - 8f01a380 - chore: add crates.io links to readme ([https://github.com/temporalio/sdk-rust/pull/1125])
2026-02-26 - c09a2901 - feat(sdk): add workflow_id and run_id to workflow context ([https://github.com/temporalio/sdk-rust/pull/1131])
2026-03-09 - 4d756127 - fix: disable default features for prometheus dependency ([https://github.com/temporalio/sdk-rust/pull/1134])
2026-03-09 - b5297e69 - Add wrappers for futures helpers ([https://github.com/temporalio/sdk-rust/pull/1133])
2026-03-10 - 05077672 - Return ClientWorkerSet from Connection ([https://github.com/temporalio/sdk-rust/pull/1147])
2026-03-11 - 5f79ef28 - Ingest API PR #709: Add target_worker_deployment_version_changed field ([https://github.com/temporalio/sdk-rust/pull/1148])

New Contributors

• @Quinn-With-Two-Ns made their first contribution in #1279
• @carlosa54 made their first contribution in #1352
• @chris-olszewski made their first contribution in #1360
• @drewhoskins-temporal made their first contribution in #1370

Full Changelog: 1.23.0...1.24.0