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Merged
ayman3000 merged 1 commit into from
Oct 9, 2026
Merged

AgentTokenUsage.cacheWriteTokens, from LLMProviderKit alpha.43 #136

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2 changes: 1 addition & 1 deletion Package.swift
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Original file line number Diff line number Diff line change
Expand Up @@ -20,7 +20,7 @@ let package = Package(
.library(name: "SwiftAgentKitMac", targets: ["SwiftAgentKitMac"]),
],
dependencies: [
.package(url: "https://github.com/ayman3000/LLMProviderKit.git", from: "0.1.0-alpha.42"),
.package(url: "https://github.com/ayman3000/LLMProviderKit.git", from: "0.1.0-alpha.43"),
.package(url: "https://github.com/swiftlang/swift-syntax.git", from: "603.0.0"),
.package(url: "https://github.com/modelcontextprotocol/swift-sdk.git", from: "0.12.1"),
.package(url: "https://github.com/swiftlang/swift-docc-plugin.git", from: "1.4.0"),
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10 changes: 8 additions & 2 deletions Sources/SwiftAgentKit/Core/AgentLLMResponse.swift
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Expand Up @@ -126,12 +126,17 @@ public struct AgentTokenUsage: Sendable, Equatable {
/// Prompt tokens served from the provider's prompt cache (subset of
/// promptTokens); nil when the provider didn't report it.
public let cachedTokens: Int?
/// Prompt tokens written into the provider's cache (Anthropic), billed
/// above plain input; nil when the provider didn't report it.
public let cacheWriteTokens: Int?

public init(promptTokens: Int?, completionTokens: Int?, totalTokens: Int?, cachedTokens: Int? = nil) {
public init(promptTokens: Int?, completionTokens: Int?, totalTokens: Int?, cachedTokens: Int? = nil,
cacheWriteTokens: Int? = nil) {
self.promptTokens = promptTokens
self.completionTokens = completionTokens
self.totalTokens = totalTokens
self.cachedTokens = cachedTokens
self.cacheWriteTokens = cacheWriteTokens
}

public static func from(_ usage: LLMUsage?) -> AgentTokenUsage? {
Expand All @@ -140,7 +145,8 @@ public struct AgentTokenUsage: Sendable, Equatable {
promptTokens: usage.promptTokens,
completionTokens: usage.completionTokens,
totalTokens: usage.totalTokens,
cachedTokens: usage.cachedTokens
cachedTokens: usage.cachedTokens,
cacheWriteTokens: usage.cacheWriteTokens
)
}
}
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10 changes: 10 additions & 0 deletions Tests/SwiftAgentKitReplayTests/StreamingUsageTests.swift
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Expand Up @@ -28,3 +28,13 @@ import SwiftAgentKit
#expect(usage?.promptTokens == 123)
#expect(usage?.completionTokens == 45)
}

/// Cache writes (Anthropic) reach the host apart from reads, so it can price
/// them at their own rate.
@Test func usageCarriesCacheWritesFromTheProvider() {
let u = AgentTokenUsage.from(LLMUsage(promptTokens: 990, completionTokens: 3, totalTokens: 993,
cachedTokens: 900, cacheWriteTokens: 40))
#expect(u?.cachedTokens == 900)
#expect(u?.cacheWriteTokens == 40)
#expect(AgentTokenUsage.from(LLMUsage(promptTokens: 5))?.cacheWriteTokens == nil)
}
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