💥 Standalone activity support by cretz · Pull Request #1307 · temporalio/sdk-python

cretz · 2026-01-28T15:15:08Z

What was changed

General list of things changed for standalone activity support:

Added client.start_activity() (and overloads)
Added client.execute_activity() (and overloads)
Add overload to client.get_async_activity_handle() with activity_id kwarg
Added client.list_activities() and associated iterator and models
Added client.count_activities() and associated models
Added client.get_activity_handle() and associated handle with common activity options
Added interceptors for many activity calls
Added client.ActivityFailureError
Added common enumerates ActivityIDReusePolicy and ActivityIDConflictPolicy
activity.Info modified to make workflow_id, workflow_namespace, workflow_run_id, and workflow_type optional
- 💥 SLIGHT BREAKING CHANGE for those manually expecting non-None fields or manually creating the info for tests
converter.BaseWorkflowSerializationContext intermediate base class removed
- 💥 SLIGHT BREAKING CHANGE for those that may have counted on this newly created class, though most should use specific types
Updated converter.ActivitySerializationContext to make workflow_id and workflow_type optional, updated activity_type and activity_task_queue to be optional and deprecated, and added optional activity_id
- 💥 SLIGHT BREAKING CHANGE for those that may have expected these to always be present during serialization, though they'll continue to be present unless you use standalone activities

This is basically a re-submitted PR of the original form at #1138 but with some slight alterations. Reviewers should set the "Hide Whitespace" option to review this more clearly.

Checklist

Closes[Feature Request] Support standalone activities #1230

Implement list/count activities alphabetical order ActivityHandle.result Implement start_activity Update sdk-core Server isn't returning RunID yet Add activity IDs to test since they are now set in context Eliminate base serialization context class Extend tests Don't hardcode workflow IDs Fix AsyncActivityHandle TEMP: Alter manual activity tests to not require worker Skip tests globally Revert "TEMP: Alter manual activity tests to not require worker" This reverts commit 7127c0f. Assert describe returns new state after transition Fix cancellation and failure tests Cleanup Add experimental notices Workaround mypy bug Skip Standalone Activity tests in CI Only support TypedSearchAttributes

This commit updates the Python SDK standalone activity implementation to match Maciej's cross-language design specification. - ActivityIdReusePolicy → ActivityIDReusePolicy - ActivityIdConflictPolicy → ActivityIDConflictPolicy - Renamed property 'id' → 'activity_id' - Renamed property 'run_id' → 'activity_run_id' - Updated internal _id and _run_id variables accordingly - Renamed 'run_id' → 'activity_run_id' - Renamed 'schedule_time' → 'scheduled_time' - Added 'namespace' field (copied from calling client) - Removed 'state_transition_count' field - Removed the separate class; all list results now return ActivityExecution - Renamed 'run_id' → 'activity_run_id' - Renamed 'schedule_time' → 'scheduled_time' - Added 'namespace', 'close_time', 'execution_duration' fields - Removed 'state_transition_count' field - Added ActivityExecutionCountAggregationGroup class - Added 'groups' field for aggregation support - Renamed 'ret_type' → 'result_type' - Renamed 'static_summary' → 'summary' - Renamed 'static_details' → 'details' - CancelActivityInput.run_id → activity_run_id - TerminateActivityInput.run_id → activity_run_id - DescribeActivityInput.run_id → activity_run_id - Added 'wait_for_cancel_completed: bool' field - Renamed parameter 'run_id' → 'activity_run_id' - Added 'namespace: str' field - Added 'activity_run_id: str | None' field (None for workflow activities) - Added 'in_workflow' property - Made workflow_id, workflow_namespace, workflow_run_id, workflow_type optional (None for standalone activities) - Deprecated 'workflow_namespace' in favor of 'namespace' - Updated tests/test_activity.py and tests/worker/test_activity.py - Fixed temporalio/contrib/opentelemetry.py - Fixed temporalio/contrib/openai_agents/_mcp.py - GetActivityResultInput and interceptor method - would require significant refactoring of the result caching mechanism in ActivityHandle

…tivity # Conflicts: # temporalio/api/activity/v1/message_pb2.py # temporalio/api/activity/v1/message_pb2.pyi # temporalio/api/workflowservice/v1/__init__.py # temporalio/api/workflowservice/v1/request_response_pb2.py # temporalio/api/workflowservice/v1/request_response_pb2.pyi # temporalio/api/workflowservice/v1/service_pb2.py # temporalio/api/workflowservice/v1/service_pb2_grpc.py # temporalio/api/workflowservice/v1/service_pb2_grpc.pyi # temporalio/bridge/sdk-core # temporalio/bridge/services_generated.py # temporalio/bridge/src/client_rpc_generated.rs

cretz · 2026-01-28T15:52:35Z

 str(http_port),
 ],
 dev_server_download_version=DEV_SERVER_DOWNLOAD_VERSION,
+ dev_server_existing_path="../next-server-cli/cli/temporal.exe",


Waiting for next CLI release to get a version of dev server that supports standalone activities. Until then, CI will not pass.

tconley1428 · 2026-01-28T23:53:56Z

@@ -1266,1436 +1273,3180 @@ async def count_workflows(
 )
 )

+ # async no-param


Oh boy git diff has done such a bad job here.

Yeah not great, though the PR does read a bit better if you "hide whitespace"

tconley1428 · 2026-01-29T17:31:13Z

Looks okay to me. Will wait for cli release to fix CI for approval.

…activity # Conflicts: # temporalio/testing/_activity.py

cretz · 2026-02-09T23:12:01Z

The change in this commit/file is due to server-side change where operation no longer guaranteed to start for really short schedule to close timeout (we test interruption behavior elsewhere, this can just test the timeout error looks proper)

cretz · 2026-02-10T13:50:41Z

All tests in this file have been skipped during the time-skipping run until temporalio/sdk-java#2741 is handled.

… gen-docs

dandavisonand others added 10 commits January 6, 2026 18:36

Update core
e0d31de

uv run poe gen-protos-docker
08dea1e

Modernize type annotations
83b11e7

Implement the rest of the spec
904c04f

Fix Core submodule version
0be7b55

Update server temporarily
d150ca1

Standalone activity updates
db4941d

cretz commented Jan 28, 2026
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cretz marked this pull request as ready for review January 28, 2026 16:02

cretz requested a review from a team as a code owner January 28, 2026 16:02

cretz changed the title ~~Standalone activity support~~💥 Standalone activity supportJan 28, 2026

Move some enums to client package
efe490e

tconley1428 reviewed Jan 28, 2026
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Comment threadtests/test_activity.py Outdated

tconley1428 reviewed Jan 29, 2026
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Comment threadtemporalio/activity.py

yuandrew mentioned this pull request Jan 29, 2026
[Feature Request] standalone activity sample temporalio/samples-python#274
Closed

dandavison mentioned this pull request Jan 29, 2026
NOT FOR MERGE: standalone activity server feature release temporalio/cli#922
Closed

cretz added 3 commits February 5, 2026 09:52

Use standalone activity server v1.5.2 for tests
8653ff9

Merge remote-tracking branch 'remotes/upstream/main' into standalone-…
072e0e1
…activity # Conflicts: # temporalio/testing/_activity.py

Update server version
6cbefe1

tconley1428 approved these changes Feb 9, 2026
View reviewed changes

cretz commented Feb 9, 2026
View reviewed changes

Update failing Nexus test
f4fef5e

cretz force-pushed the standalone-activity branch from 7054a1f to f4fef5eCompare February 10, 2026 13:03

Skip standalone activity tests on time-skipping test server
fdb763b

cretz commented Feb 10, 2026
View reviewed changes

cretz added 2 commits February 10, 2026 08:28

Fix SDK core back to proper commit, and update converter docs to pass…
f1ffffe
… gen-docs

Fix for test that fails in older proto
436ca97

cretz merged commit bd63236 into mainFeb 10, 2026
15 checks passed

cretz deleted the standalone-activity branch February 10, 2026 16:24

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💥 Standalone activity support - #1307

💥 Standalone activity support#1307
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