gemini token logging in output channel

Author: VooDisss

src/api/providers/gemini.ts

@@ -10,6 +10,7 @@ import type { JWTInput } from "google-auth-library"
 
 import { type ModelInfo, type GeminiModelId, geminiDefaultModelId, geminiModels } from "@roo-code/types"
 
+import { getGeminiTokenChannel } from "../../core/output-channel"
 import type { ApiHandlerOptions } from "../../shared/api"
 import { safeJsonParse } from "../../shared/safeJsonParse"
 
@@ -144,6 +145,13 @@ export class GeminiHandler extends BaseProvider implements SingleCompletionHandl
 				const cacheReadTokens = lastUsageMetadata.cachedContentTokenCount
 				const reasoningTokens = lastUsageMetadata.thoughtsTokenCount
 
+				const channel = getGeminiTokenChannel()
+				channel.appendLine(
+					`Gemini Usage - Model: ${model}, Prompt: ${inputTokens}, Candidates: ${outputTokens}, Cached: ${
+						cacheReadTokens ?? 0
+					}, Thoughts: ${reasoningTokens ?? 0}, Total: ${lastUsageMetadata.totalTokenCount}`,
+				)
+
 				yield {
 					type: "usage",
 					inputTokens,

src/core/output-channel.ts

@@ -0,0 +1,10 @@
+import * as vscode from "vscode"
+
+let geminiTokenChannel: vscode.OutputChannel | undefined
+
+export function getGeminiTokenChannel(): vscode.OutputChannel {
+	if (!geminiTokenChannel) {
+		geminiTokenChannel = vscode.window.createOutputChannel("Roo-Code Gemini Tokens")
+	}
+	return geminiTokenChannel
+}