requestContext key: the calling workflow's scope (its workflowId). Minted
by the trusted runtime (flowsafe's RunnerRuntime) on every leg — trust
boundary 6 applies: never populate it from client input, model output, or
tool results (security-threat-model.md).
requestContext key: the calling workflow's scope (its workflowId). Minted by the trusted runtime (flowsafe's RunnerRuntime) on every leg — trust boundary 6 applies: never populate it from client input, model output, or tool results (security-threat-model.md).