[FEATURE] outputSchema for tool specifications should be supported in models code

[mxie-extreme]

Problem Statement

In PR #818, strands supports the optional outputSchema for tool specifications. However, in the models codes, i.e. https://github.com/strands-agents/sdk-python/blob/main/src/strands/models/bedrock.py#L219, it seems on purpose not to output outputSchema for tool specifications. Why?

We actually need outputSchema for tool specifications in the models code, such that agent can intelligently and automatically apply outputSchema to figure out more accurate execution plan (i.e. cascading calls from multiple mcp tools) and prepare invoke parameters.

Proposed Solution

No response

Use Case

Agent can intelligently and automatically apply outputSchema to figure out more accurate execution plan (i.e. cascading calls from multiple mcp tools) and prepare invoke parameters.

Alternatives Solutions

No response

Additional Context

No response

[dbschmigelski]

Bedrock does not support the outputSchema key https://docs.aws.amazon.com/bedrock/latest/APIReference/API_runtime_ToolSpecification.html. If we include it they return a 4xx.

So we cannot include this in the ToolSpecification itself. You can use a hook to manually add a message describing that toolX has outputSchema Y. But it is not possible to include this in ToolSpecification for Bedrock.