Allowing protocol_serde functions to be used externally

[azriel-healthpoint]

Describe the feature

#269 indicates issues with implementing Serialize/Deserialize for all types; but since there is code in shape_api_result.rs that serializes this (and other) type(s), could they be made public so that applications can use the same logic, instead of duplicating the types just to enable serialization?

Use Case

Hi! I'm writing a bedrock agent lambda handler, and I'd like to return an ApiResult, as that (looks like) the documented return shape -- I may be wrong here, so please correct me if I am!

However, since it doesn't implement Serialize/Deserialize, which is a requirement of the lambda return type, I need another way of serializing it.

pub(crate) async fn function_handler(event: LambdaEvent<AgentEvent>)
-> Result<ApiResult, Error> {
    //    ^^^^^^^^^ the type here needs to impl Serialize;
    //              a different type can be used as long as
    //              it serializes to the bedrock-agent accepted
    //              response
    // ..
}

Proposed Solution

Probably a larger conversation, since allowing consumers to access the protocol_serde module logic may be too wide a net to cast and support as API.

Other Information

Currently InvokeInlineAgent uses that under the hood (so, client.invoke_inline_agent()..`), but I didn't want to misuse that call as a way to reach the serialization code.

Acknowledgements

• I may be able to implement this feature request
• This feature might incur a breaking change

A note for the community

Community Note

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[aajtodd]

Support for serde support is indeed a common request and there has been a lot of research and work in this area but it's not supported today.

Closing as a duplicate of one of the following:

• Add serde::Serialize/serde::Deserialize to fluent_builders #645
• [request]: Serialize/Deserialize of models for Lambda events #269

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