Azure AI Search: Array too long

[Justus Kilian Wolff (justuswolff-audit)]

Technical Feedback

The SDK already allows for a list of AISearchIndexResources to be passed to a AzureAISearchToolResource:

ai_search_resource = AzureAISearchToolResource(index_list=[index_one, index_two])

However, this raises the exeption

azure.core.exceptions.HttpResponseError: (array_above_max_length) Invalid 'tool_resources.azure_ai_search.indexes': array too long. Expected an array with maximum length 1, but got an array with length 2 instead.
Code: array_above_max_length
Message: Invalid 'tool_resources.azure_ai_search.indexes': array too long. Expected an array with maximum length 1, but got an array with length 2 instead.

Desired Outcome

Is a support of multiple index resources planned? When could we expect this feature?

Current Workaround

Not using it I guess? We might use a joined index and filter accordingly to select subgroups.

[Lee Stott (leestott)]

Justus Kilian Wolff (@justuswolff-audit) thanks for rasing this

What’s Actually Supported
As of now:

• Only one index resource can be used per AzureAISearchToolResource.
  Workaround You Mentioned
  Seems valid:
• Combine indexes into a single, broader index.
• Use filtering logic (filter parameter in search request or semantic reranker rules) to distinguish between subgroup data.
• Alternatively, split tool usage across multiple AzureAISearchToolResource instances in orchestration — though this doesn’t allow simultaneous querying.