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Improve OBO error message to guide users on proper WorkspaceClient instantiation #1062

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Improve OBO error message to guide users on proper WorkspaceClient instantiation #1062

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8 changes: 7 additions & 1 deletion databricks/sdk/credentials_provider.py
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Original file line number Diff line number Diff line change
Expand Up @@ -1138,7 +1138,13 @@ def __call__(self, cfg: "Config") -> CredentialsProvider:
header_factory = model_serving_auth_visitor(cfg, self.credential_type)
if not header_factory:
raise ValueError(
f"Unable to authenticate using {self.credential_type} in Databricks Model Serving Environment"
"Unable to authenticate using model_serving_user_credentials in Databricks Model Serving Environment. "
"This error typically occurs when the WorkspaceClient is instantiated at model-loading time rather than within a predict() or predict_stream() call. "
"Please ensure you instantiate the WorkspaceClient inside your predict() or predict_stream() function. "
"Additionally, verify that you have specified UserAuthPolicy when logging the agent model and that "
"On Behalf of User Authorization for Agents is enabled in your workspace. "
"Refer to the documentation for more information: https://docs.databricks.com/aws/en/generative-ai/agent-framework/authenticate-on-behalf-of-user. "
"If the issue persists, contact Databricks Support."
)
return header_factory
else:
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