Add taskModelSource to SubagentStartedData - #2497
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Node event type for the runtime's new optional `subagent.started` field, so VS Code Agent Host can read where a task-tool sub-agent's model input came from. Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>
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Summary
Adds the Node event type for the runtime's new optional
taskModelSourcefield onsubagent.started(github/copilot-agent-runtime#18727). VS Code Agent Host reads it to report where a task-tool sub-agent's model input came from.task_argumenttask.modelsubagent_configurationtask.model; the per-sub-agent settings entry supplied a concrete modelcustom_agent_definitiontask.model; a user-defined custom agent's definition supplied its modelunsetThe field is optional and absent for sub-agents created through non-task launch paths.
Draft until
The runtime PR lands and the CLI package the SDK codegen reads from is published. At that point this file should be regenerated from the published schema; the hand-edit here matches the runtime's generated output exactly so the regen should produce no further diff. Other language bindings are intentionally not touched — only the Node binding is consumed by VS Code Agent Host.
Validation
tsc --noEmitvitest run session-event(26 tests)prettier --checkon the generated file