Xcode Playground and FoundationModels

Question

Created 9h

Replies 2

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Participants 2

I am trying to test FoundationModels in a Swift Playground in Xcode 26.2, macOS 26.3, and am running into an issue. The following simple code generates an error:

import FoundationModels

@Generable
struct Specifications {
    @Guide(description: "Search for color")
    var color: String
}

I see the following error message in the console:

error: AIPlayground.playground:4:8: external macro implementation type 'FoundationModelsMacros.GenerableMacro' could not be found for macro 'Generable(description:)'; plugin for module 'FoundationModelsMacros' not found

The Xcode editor does not appear to recognize the @Generable or @Guide macros, despite importing FoundationModels. What step/setting am I missing?

Answered by Apple Designer in 877092022

Thanks for reaching out!

To clarify, Foundation Models framework is currently not available in Swift Playgrounds, which you get if you do Xcode > File > New > Playground... Overall Swift Playgrounds only support a subset of the SDK.

Foundation Models is supported in Xcode inline Playgrounds though, so if you do:

import Playgrounds
import FoundationModels

@Generable
struct Specifications {
    @Guide(description: "Search for color")
    var color: String
}

#Playground {
    let session = LanguageModelSession()
    let response = try await session.respond(
        to: "Help me search for orange", 
        generating: Specifications.self
    )  
}

This should work.

Boost

Answer 1

Apple Designer OP

Apple

7h

Accepted Answer

Recommended

Thanks for reaching out!

To clarify, Foundation Models framework is currently not available in Swift Playgrounds, which you get if you do Xcode > File > New > Playground... Overall Swift Playgrounds only support a subset of the SDK.

Foundation Models is supported in Xcode inline Playgrounds though, so if you do:

import Playgrounds
import FoundationModels

@Generable
struct Specifications {
    @Guide(description: "Search for color")
    var color: String
}

#Playground {
    let session = LanguageModelSession()
    let response = try await session.respond(
        to: "Help me search for orange", 
        generating: Specifications.self
    )  
}

This should work.

0

Answer 2

jbaraga OP

5h

That works! Thank you.

0