feat: add tool support for structured outputs.

[alihankoc]

Hi,

I’m using Prism with both the direct Anthropic provider and the AWS Bedrock provider. Tool/function calling works correctly when I use the native Anthropic integration, but the same tool definitions are completely ignored when I switch to Bedrock with structured output.

Details:
• Models tested: Claude Sonnet (4.x equivalent on Bedrock)
• Setup:
Prism::structured()->using(Bedrock::KEY, 'anthropic.claude...')->withTools($tools)...

Behavior:
• With Anthropic provider: tools are sent, model returns tool_use blocks correctly.
• With Bedrock provider: tools are not included in the request payload at all, and the model never attempts a tool call, even with ToolChoice::Any.

It seems the Bedrock adapter currently does not map Prism tools to Anthropic’s tool_use / tools schema when use structured output, so the feature is silently disabled for all Claude models on Bedrock.

Expected behavior:
The Bedrock provider should forward tool definitions and handle tool_use responses in the same way as the Anthropic provider.

This makes it currently impossible to use function/tool calling with Claude on Bedrock through Prism, even though the underlying model supports it.

Thanks!