Preserve model providers when reloading v2 agents - #36906
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## Why Reloading an unloaded v2 agent could inherit the model provider from the agent that triggered the reload, even though the worker's model was restored from its persisted thread state. ## What changed - Restore both the model and model provider from the stored thread when reloading a v2 agent. - Return an invalid-request error if the stored provider is no longer present in the configured provider map. ## Testing Extend the v2 agent reload test to trigger the reload with a different sender provider and verify that the worker retains its stored provider. GitOrigin-RevId: 6401d9f0d1c116e9954e3bd193d016f04da5f223
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Preserve model providers when reloading v2 agents
Why
Reloading an unloaded v2 agent could inherit the model provider from the
agent that triggered the reload, even though the worker's model was restored
from its persisted thread state.
What changed
reloading a v2 agent.
in the configured provider map.
Testing
Extend the v2 agent reload test to trigger the reload with a different sender
provider and verify that the worker retains its stored provider.