Used watchOS 4.0 as a baseline and updated function requirements as such

Package.swift

@@ -23,7 +23,7 @@ let package = Package(
     .iOS(.v11),
     .macOS(.v10_13),
     .macCatalyst(.v13),
-    .watchOS(.v8)
+    .watchOS(.v4)
   ],
   products: [
     .library(

Sources/GoogleAI/Chat.swift

@@ -84,7 +84,7 @@ public class Chat {
   /// and response will be added to the history. If unsuccessful, history will remain unchanged.
   /// - Parameter parts: The new content to send as a single chat message.
   /// - Returns: A stream containing the model's response or an error if an error occurred.
-  @available(macOS 12.0, *)
+  @available(macOS 12.0, watchOS 8.0, *)
   public func sendMessageStream(_ parts: any ThrowingPartsRepresentable...)
     -> AsyncThrowingStream<GenerateContentResponse, Error> {
     return try sendMessageStream([ModelContent(parts: parts)])
@@ -94,7 +94,7 @@ public class Chat {
   /// and response will be added to the history. If unsuccessful, history will remain unchanged.
   /// - Parameter content: The new content to send as a single chat message.
   /// - Returns: A stream containing the model's response or an error if an error occurred.
-  @available(macOS 12.0, *)
+  @available(macOS 12.0, watchOS 8.0, *)
   public func sendMessageStream(_ content: @autoclosure () throws -> [ModelContent])
     -> AsyncThrowingStream<GenerateContentResponse, Error> {
     let resolvedContent: [ModelContent]
@@ -188,4 +188,4 @@ public class Chat {
       return ModelContent(role: "user", parts: content.parts)
     }
   }
-}
+}

Sources/GoogleAI/CountTokensRequest.swift

@@ -14,14 +14,14 @@
 
 import Foundation
 
-@available(iOS 15.0, macOS 11.0, macCatalyst 15.0, watchOS 7.0, *)
+@available(iOS 15.0, macOS 11.0, macCatalyst 15.0, *)
 struct CountTokensRequest {
   let model: String
   let generateContentRequest: GenerateContentRequest
   let options: RequestOptions
 }
 
-@available(iOS 15.0, macOS 11.0, macCatalyst 15.0, watchOS 7.0, *)
+@available(iOS 15.0, macOS 11.0, macCatalyst 15.0, *)
 extension CountTokensRequest: GenerativeAIRequest {
   typealias Response = CountTokensResponse
 
@@ -31,20 +31,20 @@ extension CountTokensRequest: GenerativeAIRequest {
 }
 
 /// The model's response to a count tokens request.
-@available(iOS 15.0, macOS 11.0, macCatalyst 15.0, watchOS 7.0, *)
+@available(iOS 15.0, macOS 11.0, macCatalyst 15.0, *)
 public struct CountTokensResponse {
   /// The total number of tokens in the input given to the model as a prompt.
   public let totalTokens: Int
 }
 
 // MARK: - Codable Conformances
 
-@available(iOS 15.0, macOS 11.0, macCatalyst 15.0, watchOS 7.0, *)
+@available(iOS 15.0, macOS 11.0, macCatalyst 15.0, *)
 extension CountTokensRequest: Encodable {
   enum CodingKeys: CodingKey {
     case generateContentRequest
   }
 }
 
-@available(iOS 15.0, macOS 11.0, macCatalyst 15.0, watchOS 7.0, *)
-extension CountTokensResponse: Decodable {}
+@available(iOS 15.0, macOS 11.0, macCatalyst 15.0, *)
+extension CountTokensResponse: Decodable {}

Sources/GoogleAI/Errors.swift

@@ -186,4 +186,4 @@ enum RPCErrorMessage: String {
 enum InvalidCandidateError: Error {
   case emptyContent(underlyingError: Error)
   case malformedContent(underlyingError: Error)
-}
+}

Sources/GoogleAI/FunctionCalling.swift

@@ -292,4 +292,4 @@ extension FunctionCallingConfig.Mode: Encodable {}
 
 extension ToolConfig: Encodable {}
 
-extension FunctionResponse: Encodable {}
+extension FunctionResponse: Encodable {}

Sources/GoogleAI/GenerateContentError.swift

@@ -41,4 +41,4 @@ public enum GenerateContentError: Error {
   /// - Important: The API is only available in
   /// [specific regions](https://ai.google.dev/available_regions#available_regions).
   case unsupportedUserLocation
-}
+}

Sources/GoogleAI/GenerateContentRequest.swift

@@ -14,7 +14,7 @@
 
 import Foundation
 
-@available(iOS 15.0, macOS 11.0, macCatalyst 15.0, watchOS 7.0, *)
+@available(iOS 15.0, macOS 11.0, macCatalyst 15.0, *)
 struct GenerateContentRequest {
   /// Model name.
   let model: String
@@ -28,7 +28,7 @@ struct GenerateContentRequest {
   let options: RequestOptions
 }
 
-@available(iOS 15.0, macOS 11.0, macCatalyst 15.0, watchOS 7.0, *)
+@available(iOS 15.0, macOS 11.0, macCatalyst 15.0, *)
 extension GenerateContentRequest: Encodable {
   enum CodingKeys: String, CodingKey {
     case model
@@ -53,4 +53,4 @@ extension GenerateContentRequest: GenerativeAIRequest {
       return URL(string: "\(modelURL):generateContent")!
     }
   }
-}
+}

Sources/GoogleAI/GenerateContentResponse.swift

@@ -82,7 +82,7 @@ public struct GenerateContentResponse {
 
 /// A struct representing a possible reply to a content generation prompt. Each content generation
 /// prompt may produce multiple candidate responses.
-@available(iOS 15.0, macOS 11.0, macCatalyst 15.0, watchOS 7.0, *)
+@available(iOS 15.0, macOS 11.0, macCatalyst 15.0, *)
 public struct CandidateResponse {
   /// The response's content.
   public let content: ModelContent
@@ -108,14 +108,14 @@ public struct CandidateResponse {
 }
 
 /// A collection of source attributions for a piece of content.
-@available(iOS 15.0, macOS 11.0, macCatalyst 15.0, watchOS 7.0, *)
+@available(iOS 15.0, macOS 11.0, macCatalyst 15.0, *)
 public struct CitationMetadata {
   /// A list of individual cited sources and the parts of the content to which they apply.
   public let citationSources: [Citation]
 }
 
 /// A struct describing a source attribution.
-@available(iOS 15.0, macOS 11.0, macCatalyst 15.0, watchOS 7.0, *)
+@available(iOS 15.0, macOS 11.0, macCatalyst 15.0, *)
 public struct Citation {
   /// The inclusive beginning of a sequence in a model response that derives from a cited source.
   public let startIndex: Int
@@ -131,7 +131,7 @@ public struct Citation {
 }
 
 /// A value enumerating possible reasons for a model to terminate a content generation request.
-@available(iOS 15.0, macOS 11.0, macCatalyst 15.0, watchOS 7.0, *)
+@available(iOS 15.0, macOS 11.0, macCatalyst 15.0, *)
 public enum FinishReason: String {
   case unknown = "FINISH_REASON_UNKNOWN"
 
@@ -156,7 +156,7 @@ public enum FinishReason: String {
 }
 
 /// A metadata struct containing any feedback the model had on the prompt it was provided.
-@available(iOS 15.0, macOS 11.0, macCatalyst 15.0, watchOS 7.0, *)
+@available(iOS 15.0, macOS 11.0, macCatalyst 15.0, *)
 public struct PromptFeedback {
   /// A type describing possible reasons to block a prompt.
   public enum BlockReason: String {
@@ -239,7 +239,7 @@ extension GenerateContentResponse.UsageMetadata: Decodable {
   }
 }
 
-@available(iOS 15.0, macOS 11.0, macCatalyst 15.0, watchOS 7.0, *)
+@available(iOS 15.0, macOS 11.0, macCatalyst 15.0, *)
 extension CandidateResponse: Decodable {
   enum CodingKeys: CodingKey {
     case content
@@ -286,10 +286,10 @@ extension CandidateResponse: Decodable {
   }
 }
 
-@available(iOS 15.0, macOS 11.0, macCatalyst 15.0, watchOS 7.0, *)
+@available(iOS 15.0, macOS 11.0, macCatalyst 15.0, *)
 extension CitationMetadata: Decodable {}
 
-@available(iOS 15.0, macOS 11.0, macCatalyst 15.0, watchOS 7.0, *)
+@available(iOS 15.0, macOS 11.0, macCatalyst 15.0, *)
 extension Citation: Decodable {
   enum CodingKeys: CodingKey {
     case startIndex
@@ -342,7 +342,7 @@ extension PromptFeedback.BlockReason: Decodable {
   }
 }
 
-@available(iOS 15.0, macOS 11.0, macCatalyst 15.0, watchOS 7.0, *)
+@available(iOS 15.0, macOS 11.0, macCatalyst 15.0, *)
 extension PromptFeedback: Decodable {
   enum CodingKeys: CodingKey {
     case blockReason
@@ -364,4 +364,4 @@ extension PromptFeedback: Decodable {
       safetyRatings = []
     }
   }
-}
+}

Sources/GoogleAI/GenerationConfig.swift

@@ -16,7 +16,7 @@ import Foundation
 
 /// A struct defining model parameters to be used when sending generative AI
 /// requests to the backend model.
-@available(iOS 15.0, macOS 11.0, macCatalyst 15.0, watchOS 7.0, *)
+@available(iOS 15.0, macOS 11.0, macCatalyst 15.0, *)
 public struct GenerationConfig {
   /// A parameter controlling the degree of randomness in token selection. A
   /// temperature of zero is deterministic, always choosing the
@@ -106,5 +106,5 @@ public struct GenerationConfig {
 
 // MARK: - Codable Conformances
 
-@available(iOS 15.0, macOS 11.0, macCatalyst 15.0, watchOS 7.0, *)
-extension GenerationConfig: Encodable {}
+@available(iOS 15.0, macOS 11.0, macCatalyst 15.0, *)
+extension GenerationConfig: Encodable {}

Sources/GoogleAI/GenerativeAIRequest.swift

@@ -14,7 +14,7 @@
 
 import Foundation
 
-@available(iOS 15.0, macOS 11.0, macCatalyst 15.0, watchOS 7.0, *)
+@available(iOS 15.0, macOS 11.0, macCatalyst 15.0, *)
 protocol GenerativeAIRequest: Encodable {
   associatedtype Response: Decodable
 
@@ -24,7 +24,7 @@ protocol GenerativeAIRequest: Encodable {
 }
 
 /// Configuration parameters for sending requests to the backend.
-@available(iOS 15.0, macOS 11.0, macCatalyst 15.0, watchOS 7.0, *)
+@available(iOS 15.0, macOS 11.0, macCatalyst 15.0, *)
 public struct RequestOptions {
   /// The request’s timeout interval in seconds.
   let timeout: TimeInterval
@@ -41,4 +41,4 @@ public struct RequestOptions {
     self.timeout = timeout
     self.apiVersion = apiVersion
   }
-}
+}

Sources/GoogleAI/GenerativeAIService.swift

@@ -52,7 +52,7 @@ struct GenerativeAIService {
     return try parseResponse(T.Response.self, from: data)
   }
 
-  @available(macOS 12.0, *)
+  @available(macOS 12.0, watchOS 8.0, *)
   func loadRequestStream<T: GenerativeAIRequest>(request: T)
     -> AsyncThrowingStream<T.Response, Error> {
     return AsyncThrowingStream { continuation in
@@ -161,6 +161,7 @@ struct GenerativeAIService {
     return urlRequest
   }
 
+  @available(watchOS 7.0, *)
   private func httpResponse(urlResponse: URLResponse) throws -> HTTPURLResponse {
     // Verify the status code is 200
     guard let response = urlResponse as? HTTPURLResponse else {
@@ -209,6 +210,7 @@ struct GenerativeAIService {
     }
   }
 
+  @available(watchOS 7.0, *)
   private func parseResponse<T: Decodable>(_ type: T.Type, from data: Data) throws -> T {
     do {
       return try JSONDecoder().decode(type, from: data)
@@ -222,6 +224,7 @@ struct GenerativeAIService {
   }
 
   #if DEBUG
+    @available(watchOS 7.0, *)
     private func cURLCommand(from request: URLRequest) -> String {
       var returnValue = "curl "
       if let allHeaders = request.allHTTPHeaderFields {
@@ -251,4 +254,4 @@ struct GenerativeAIService {
       """)
     }
   #endif // DEBUG
-}
+}

Sources/GoogleAI/GenerativeAISwift.swift

@@ -18,10 +18,10 @@ import Foundation
 #endif
 
 /// Constants associated with the GenerativeAISwift SDK.
-@available(iOS 15.0, macOS 11.0, macCatalyst 15.0, watchOS 7.0, *)
+@available(iOS 15.0, macOS 11.0, macCatalyst 15.0, *)
 public enum GenerativeAISwift {
   /// String value of the SDK version
   public static let version = "0.5.4"
   /// The Google AI backend endpoint URL.
   static let baseURL = "https://generativelanguage.googleapis.com"
-}
+}

Sources/GoogleAI/GenerativeModel.swift

@@ -220,7 +220,7 @@ public final class GenerativeModel {
   /// for conforming types).
   /// - Returns: A stream wrapping content generated by the model or a ``GenerateContentError``
   ///     error if an error occurred.
-  @available(macOS 12.0, *)
+  @available(macOS 12.0, watchOS 8.0, *)
   public func generateContentStream(_ parts: any ThrowingPartsRepresentable...)
     -> AsyncThrowingStream<GenerateContentResponse, Error> {
     return try generateContentStream([ModelContent(parts: parts)])
@@ -231,7 +231,7 @@ public final class GenerativeModel {
   /// - Parameter content: The input(s) given to the model as a prompt.
   /// - Returns: A stream wrapping content generated by the model or a ``GenerateContentError``
   ///     error if an error occurred.
-  @available(macOS 12.0, *)
+  @available(macOS 12.0, watchOS 8.0, *)
   public func generateContentStream(_ content: @autoclosure () throws -> [ModelContent])
     -> AsyncThrowingStream<GenerateContentResponse, Error> {
     let evaluatedContent: [ModelContent]
@@ -370,7 +370,7 @@ public final class GenerativeModel {
 }
 
 /// An error thrown in `GenerativeModel.countTokens(_:)`.
-@available(iOS 15.0, macOS 11.0, macCatalyst 15.0, watchOS 7.0, *)
+@available(iOS 15.0, macOS 11.0, macCatalyst 15.0, *)
 public enum CountTokensError: Error {
   case internalError(underlying: Error)
-}
+}

Sources/GoogleAI/JSONValue.swift

@@ -93,4 +93,4 @@ extension JSONValue: Encodable {
   }
 }
 
-extension JSONValue: Equatable {}
+extension JSONValue: Equatable {}

Sources/GoogleAI/Logging.swift

@@ -53,4 +53,4 @@ struct Logging {
       return Logger(.disabled)
     }
   }()
-}
+}

Sources/GoogleAI/ModelContent.swift

@@ -17,7 +17,7 @@ import Foundation
 /// A type describing data in media formats interpretable by an AI model. Each generative AI
 /// request or response contains an `Array` of ``ModelContent``s, and each ``ModelContent`` value
 /// may comprise multiple heterogeneous ``ModelContent/Part``s.
-@available(iOS 15.0, macOS 11.0, macCatalyst 15.0, watchOS 7.0, *)
+@available(iOS 15.0, macOS 11.0, macCatalyst 15.0, *)
 public struct ModelContent: Equatable {
   /// A discrete piece of data in a media format intepretable by an AI model. Within a single value
   /// of ``Part``, different data types may not mix.
@@ -118,10 +118,10 @@ public struct ModelContent: Equatable {
 
 // MARK: Codable Conformances
 
-@available(iOS 15.0, macOS 11.0, macCatalyst 15.0, watchOS 7.0, *)
+@available(iOS 15.0, macOS 11.0, macCatalyst 15.0, *)
 extension ModelContent: Codable {}
 
-@available(iOS 15.0, macOS 11.0, macCatalyst 15.0, watchOS 7.0, *)
+@available(iOS 15.0, macOS 11.0, macCatalyst 15.0, *)
 extension ModelContent.Part: Codable {
   enum CodingKeys: String, CodingKey {
     case text
@@ -188,4 +188,4 @@ extension ModelContent.Part: Codable {
       ))
     }
   }
-}
+}