Nexus Standalone: Start + Describe by stephanos · Pull Request #9487 · temporalio/temporal

stephanos · 2026-03-11T22:31:43Z

What changed?

Add Nexus Standalone Describe and Start handlers.

How did you test it?

stephanos · 2026-03-16T22:58:17Z

chasm/lib/nexusoperation/operation_executors.go

 ) (bool, error) {
-	return false, serviceerror.NewUnimplemented("unimplemented")
+	// TODO: implement
+	return false, nil


Required to make tests pass.

stephanos · 2026-03-17T15:38:36Z

chasm/lib/nexusoperation/operation.go

+
+func operationExecutionStatus(status nexusoperationpb.OperationStatus) enumspb.NexusOperationExecutionStatus {
+	switch status {
+	case nexusoperationpb.OPERATION_STATUS_SCHEDULED,


Is this right?

Looks right to me.

stephanos · 2026-03-17T15:56:24Z

chasm/lib/nexusoperation/handler.go

+}
+
+// DescribeNexusOperation queries current operation state.
+// TODO: Add long-poll support.


Will be added together with Poll API.

stephanos · 2026-03-17T16:07:41Z

chasm/lib/nexusoperation/operation.go

+		return chasm.TerminateComponentResponse{}, nil
+	}
+	return chasm.TerminateComponentResponse{}, transitionFailed.Apply(o, ctx, EventFailed{})
+}


^ needed for chasm.RootComponent

bergundy · 2026-03-18T17:30:23Z

chasm/lib/nexusoperation/proto/v1/service.proto

+
+service NexusOperationService {
+    rpc StartNexusOperation(StartNexusOperationRequest) returns (StartNexusOperationResponse) {
+        option (temporal.server.api.routing.v1.routing).business_id = "frontend_request.operation_id";


You will need to add to both RPCs:

option (temporal.server.api.common.v1.api_category).category = API_CATEGORY_STANDARD;

Use nexusoperation.Enabled flag instead of ChasmNexusEnabled for standalone operation APIs. All handlers check the feature flag. Added StartDisabled/DescribeDisabled tests. Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

Per review feedback: both StartNexusOperation and DescribeNexusOperation need API_CATEGORY_STANDARD annotation. Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

bergundy

Overall LGTM. I had a hard stop and didn't quite get to reviewing the tests or the the search attribute validation logic (which is okay if it was copied from SAA).

bergundy · 2026-03-18T17:32:41Z

chasm/lib/nexusoperation/frontend.go

-func (h *frontendHandler) StartNexusOperationExecution(context.Context, *workflowservice.StartNexusOperationExecutionRequest) (*workflowservice.StartNexusOperationExecutionResponse, error) {
-	return nil, serviceerror.NewUnimplemented("StartNexusOperationExecution not implemented")
+func (h *frontendHandler) checkEnabled(namespaceName string) error {
+	if !h.config.ChasmEnabled(namespaceName) || !h.config.ChasmNexusEnabled(namespaceName) {


We need a separate DC here to enable standalone to be able to turn the two separate features on.

bergundy · 2026-03-19T01:01:04Z

chasm/lib/nexusoperation/handler.go

+			NamespaceID: req.GetNamespaceId(),
+			BusinessID:  frontendReq.GetOperationId(),
+		},
+		func(ctx chasm.MutableContext, req *nexusoperationpb.StartNexusOperationRequest) (*Operation, error) {


Would you please create a NewStandaloneOperation constructor instead of inlining all of this logic?

bergundy · 2026-03-19T01:13:39Z

chasm/lib/nexusoperation/operation.go

+
+// closeTime returns the close time of the operation based on LastAttemptCompleteTime for terminal states.
+func (o *Operation) closeTime() *timestamppb.Timestamp {
+	switch o.Status {


nit: you can also check if LifecycleState isn't "running", it would save a tiny bit of duplicate logic but not critical.

bergundy · 2026-03-19T01:14:30Z

chasm/lib/nexusoperation/operation.go

+
+func operationExecutionStatus(status nexusoperationpb.OperationStatus) enumspb.NexusOperationExecutionStatus {
+	switch status {
+	case nexusoperationpb.OPERATION_STATUS_SCHEDULED,


Looks right to me.

stephanos changed the title ~~Stephanos/nexus standalone describe~~ Nexus Standalone: Describe Mar 11, 2026

stephanos changed the base branch from feature/nexus-standalone to stephanos/standalone-nexus-op March 11, 2026 22:32

stephanos force-pushed the stephanos/nexus-standalone-describe branch from 469761d to 5653b5c Compare March 11, 2026 22:33

stephanos force-pushed the stephanos/standalone-nexus-op branch from c11d5be to 18cc7c6 Compare March 11, 2026 22:41

stephanos force-pushed the stephanos/nexus-standalone-describe branch from 5653b5c to e524f3e Compare March 11, 2026 22:41

stephanos force-pushed the stephanos/standalone-nexus-op branch from 18cc7c6 to ace3e84 Compare March 11, 2026 22:46

stephanos force-pushed the stephanos/nexus-standalone-describe branch from e524f3e to 9f16247 Compare March 11, 2026 22:46

stephanos force-pushed the stephanos/standalone-nexus-op branch from ace3e84 to 3984b20 Compare March 11, 2026 22:48

stephanos force-pushed the stephanos/nexus-standalone-describe branch from 9f16247 to 318f104 Compare March 11, 2026 22:50

stephanos force-pushed the stephanos/standalone-nexus-op branch from 3984b20 to f29c9cc Compare March 11, 2026 23:21

stephanos force-pushed the stephanos/nexus-standalone-describe branch from 318f104 to d0991cc Compare March 11, 2026 23:24

stephanos force-pushed the stephanos/standalone-nexus-op branch 2 times, most recently from 8bcb6e7 to d7411cf Compare March 11, 2026 23:52

stephanos force-pushed the stephanos/nexus-standalone-describe branch from d0991cc to 764aa94 Compare March 11, 2026 23:52

stephanos force-pushed the stephanos/standalone-nexus-op branch from d7411cf to 4d205bd Compare March 12, 2026 00:15

stephanos force-pushed the stephanos/nexus-standalone-describe branch from 764aa94 to 48cb4b5 Compare March 12, 2026 00:15

stephanos force-pushed the stephanos/standalone-nexus-op branch 2 times, most recently from 853646f to 9d77393 Compare March 12, 2026 01:37

stephanos force-pushed the stephanos/nexus-standalone-describe branch from 48cb4b5 to a56b849 Compare March 12, 2026 01:38

stephanos force-pushed the stephanos/standalone-nexus-op branch 5 times, most recently from a7032dd to b362c16 Compare March 12, 2026 02:47

stephanos force-pushed the stephanos/nexus-standalone-describe branch from a56b849 to dd59299 Compare March 12, 2026 15:06

stephanos changed the base branch from stephanos/standalone-nexus-op to feature/nexus-standalone March 12, 2026 15:07

stephanos changed the base branch from feature/nexus-standalone to stephanos/standalone-nexus-op March 12, 2026 15:08

Base automatically changed from stephanos/standalone-nexus-op to feature/nexus-standalone March 12, 2026 17:11

stephanos force-pushed the stephanos/nexus-standalone-describe branch from dd59299 to 3573e90 Compare March 12, 2026 20:19

stephanos changed the title ~~Nexus Standalone: Describe~~ Nexus Standalone: Start + Describe Mar 12, 2026

stephanos force-pushed the feature/nexus-standalone branch from 01a8083 to 293d69c Compare March 16, 2026 22:25

temporalio deleted a comment from semgrep-managed-scans bot Mar 16, 2026

stephanos force-pushed the feature/nexus-standalone branch from 293d69c to 259059f Compare March 16, 2026 22:50

stephanos force-pushed the stephanos/nexus-standalone-describe branch from c2bb9c9 to fc63ef8 Compare March 16, 2026 22:50

stephanos commented Mar 16, 2026

View reviewed changes

stephanos force-pushed the feature/nexus-standalone branch from 259059f to 8ae49db Compare March 17, 2026 15:23

stephanos force-pushed the stephanos/nexus-standalone-describe branch from fc63ef8 to e384f18 Compare March 17, 2026 15:23

stephanos commented Mar 17, 2026

View reviewed changes

stephanos force-pushed the stephanos/nexus-standalone-describe branch 4 times, most recently from bffc1f9 to 942ddd7 Compare March 17, 2026 15:56

stephanos commented Mar 17, 2026

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stephanos added 5 commits March 17, 2026 15:43

Nexus Standalone: Start + Describe

42f5bdf

drop extra error check

619779e

fix

28f16a4

validate endpoint eagerly

97ef55e

fix lint

e3e7ef7

bergundy reviewed Mar 18, 2026

View reviewed changes

stephanos and others added 6 commits March 18, 2026 10:54

Nexus Standalone: Feature flag

1404d9d

Add api_category annotation to CHASM nexus operation RPCs

ad06282

Per review feedback: both StartNexusOperation and DescribeNexusOperation need API_CATEGORY_STANDARD annotation. Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

use helper

29fbe99

unexport helper

da88c50

Merge stephanos/nexus-standalone-feature-flag (unexport helper)

ea993d8

bergundy approved these changes Mar 19, 2026

View reviewed changes

stephanos added 3 commits March 19, 2026 09:01

newStandaloneOperation

5fd2c61

simplify closeTime

e7d1c7a

Merge feature/nexus-standalone (feature flag PR merged)

ee338f6

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Nexus Standalone: Start + Describe#9487

Nexus Standalone: Start + Describe#9487
stephanos merged 14 commits intofeature/nexus-standalonefrom
stephanos/nexus-standalone-describe

stephanos commented Mar 11, 2026 •

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stephanos commented Mar 11, 2026 • edited Loading Uh oh! There was an error while loading. Please reload this page.

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stephanos commented Mar 11, 2026 •

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