アプリの保護：エージェント型機能によるリスクの軽減

12:50 - Tools

// Tools

struct OrderTeaTool: Tool {
  let name = "orderTeaTool"
  let description: String = "Orders a particular quantity of a tea from the store."
  // Arguments
  // Implementation
}

struct PostAndFetchPublicFeedTool: Tool {
  let name = "postAndFetchPublicFeedTool"
  let description: String = "Posts a message to the public feed.”
  // Arguments
  // Implementation
}

13:13 - Profile

// Profile

class LooseLeafAgent {
  struct DefaultProfile: LanguageModelSession.DynamicProfile {
    var body: some DynamicProfile {
      Profile {
        Instructions("You are a helpful, tea-loving assistant ... ")

        OrderTeaTool()
        PostAndFetchPublicFeedTool()
      }
      .model(SystemLanguageModel())
    }
  }
}

13:28 - Session

// Session 

class LooseLeafAgent {
  struct DefaultProfile: LanguageModelSession.DynamicProfile {
    var body: some DynamicProfile {
      Profile {
        Instructions("You are a helpful, tea-loving assistant ... ")

        OrderTeaTool()
        PostAndFetchPublicFeedTool()
      }
      .model(SystemLanguageModel())
    }
  }

  let session: LanguageModelSession

  public init() {
    self.session = LanguageModelSession(profile: DefaultProfile())
  }
}

14:33 - Confirmation via onToolCall

// Confirmation via onToolCall

var body: some DynamicProfile {
  Profile {
    Instructions("You are a helpful, tea-loving assistant ... ")

    OrderTeaTool() // Financial impact; risky tool.
    // Other Tools
  }
  
  .onToolCall { call in
    guard call.toolName == "orderTeaTool" else {
      return
    }
    guard ConfirmationAction.confirmWithUser() else {
      throw LooseLeafError.userConfirmationDenied
    }
  }
}

15:56 - Spotlighting via historyTransform

// Spotlighting via historyTransform

var body: some DynamicProfile {
  Profile {
    Instructions("You are a helpful, tea-loving assistant ... ")

    PostAndFetchPublicFeedTool() // Returns untrusted data; requires spotlighting
    // Other Tools
  }

  .historyTransform {γentries in
    entries.map { entry in
      guard case .toolOutput(var toolOutput) = entry,
        toolOutput.toolName == "postAndFetchPublicFeedTool"
      else {
        return entry
      }
    }
    toolOutput.segments = toolOutput.segments.map { segment in
      delimit(segment: segment,
              startDelimiter: "<<UNTRUSTED>>",
              endDelimiter: "<</UNTRUSTED>>")
    }
    return .toolOutput(toolOutput)
  }
}

func delimit(segment: Transcript.Segment,
             startDelimiter: String,
             endDelimiter: String) -> Transcript.Segment

16:48 - Redaction via historyTransform

// Redaction via historyTransform

var body: some DynamicProfile {
  Profile {
    Instructions("You are a helpful, tea-loving assistant ... ")

    PostAndFetchPublicFeedTool() // Returns untrusted data; requires spotlighting
    // Other Tools
  }

  .historyTransform {γentries in
    entries.map { entry in
      guard case .toolOutput(var toolOutput) = entry,
        toolOutput.toolName == "postAndFetchPublicFeedTool"
      else {
        return entry
      }
    }
    toolOutput.segments = toolOutput.segments.map { segment in
      redactPII(segment: segment,
                placeHolder: "[REDACTED]")
    }
    return .toolOutput(toolOutput)
  }
}

func redactPII(segment: Transcript.Segment,
               placeHolder: String) -> Transcript.Segment

23:08 - Intent authentication policy

// Intent authentication policy

struct DeletePhotoIntent: DeleteIntent {
    var entities: [LooseLeafPhoto]

    static var authenticationPolicy: IntentAuthenticationPolicy = .requiresAuthentication

    func perform() async throws -> some IntentResult {
        // Implementation
    }
}

23:27 - Schema authentication policy

// Schema authentication policy

@AppIntent(schema: .photos.deleteAssets)
struct DeletePhotoIntent {
    var entities: [LooseLeafPhoto]

    // Example: Schema default authentication policy is .requiresAuthentication

    func perform() async throws -> some IntentResult {
        // Implementation
    }
}