fix(adapters/langgraph): forward ManagerWorkers delegation task as SystemMessage#24
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…stemMessage The manager's delegated task was forwarded to each worker subgraph as a HumanMessage. Because the worker inherits the parent node's astream_events callbacks, that input message streams out to consumers and renders in the chat UI as a spurious end-user turn — the sub-agent's prompt shown as if the user typed it. Forward the task as a SystemMessage instead: it is the manager's internal instruction to the worker, not an end-user message. The worker is still driven by the task, worker state stays isolated (the top-level snapshot is unchanged), and the OpenAI-compatible models the runtime uses accept a system-only message list. Add a regression test asserting the worker receives its task as a SystemMessage with no HumanMessage in its input.
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Problem
When a
ManagerWorkersmanager delegates to a worker, the task was forwarded to the worker subgraph as aHumanMessage. The worker inherits the parent node'sastream_eventscallbacks, so that input message streams out to consumers and renders in the chat UI as a spurious end-user turn — the sub-agent's prompt appears as if the user typed it.The runtime and oi-apps-core faithfully propagate the message role; the
humanclassification originates here, in_wrap_worker_for_subgraph._worker_input.Fix
Forward the delegated task as a
SystemMessageinstead of aHumanMessage— it is the manager's internal instruction to the worker, not an end-user message.ToolMessagereturns to the parent, so the top-level message snapshot is unchanged.Test
Adds
test_worker_receives_its_task_as_a_system_message, which captures the worker model's input and asserts the delegated task arrives as aSystemMessagewith noHumanMessageleaking in.Offline ManagerWorkers / Swarm / Flow-node + serialization suites pass.