Add Nexus worker service for server-to-worker commands#708
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Add Nexus worker service for server-to-worker commands#708
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cretz
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LGTM, though would want to see end-to-end working including in an SDK if possible before approving
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This enables the server to track which worker is executing eager-dispatched activities, allowing activity cancellation to be routed correctly.
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bergundy
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LGTM, don't merge this until you've generated the code and verified that this API works across SDK and server.
There will probably be a separate code generation project that will construct the YAML from protos to prevent the need to define services in separate places but this is a good start IMHO.
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This is our first Nexus service, so lots of things undecided. I added comments, but would like to hear others' opinions.
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temporal/api/nexusservices/workerservice/v1/request_response.proto
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Made-with: Cursor
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…nstance-key-to-wft-complete
…comment Made-with: Cursor
…vity-cancel Made-with: Cursor
- Rename WorkerCommandsRequest/Response to ExecuteCommandsRequest/Response to match the operation name (bergundy feedback) - Change operation name from executeCommands to ExecuteCommands (PascalCase) - Add doc: results list must be 1:1 with commands list (Sushisource feedback) Made-with: Cursor
Move WorkerCommand, CancelActivityCommand, WorkerCommandResult, and CancelActivityResult to temporal.api.worker.v1 as top-level messages. request_response.proto now only contains ExecuteCommandsRequest and ExecuteCommandsResponse, following the repo convention. (bergundy feedback) Made-with: Cursor
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Just one comment on the location of the schema file.
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April 6, 2026 23:06
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
Removed comment about service definition in request_response.proto.
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Summary
Defines a Nexus service for server-to-worker communication, starting with activity cancellation support.
Design Decision
We chose a generic command API (
ExecuteCommandsRequestwithoneofcommand types) instead of a cancel-specific API. This allows a future optimization to batch multiple commands (cancel, pause, etc) in a single request and deliver to a worker in one RPC.Files
temporal/api/nexusservices/workerservice/v1/request_response.proto- request response definitionsnexus-rpc/temporal-proto-models-nexusrpc.yaml- Nexus service definitionRelated