feat: add Gemini CLI provider integration

- Add @google/gemini-cli-core dependency
- Create GeminiCliHandler provider implementation using OAuth authentication
- Add type definitions for gemini-cli models
- Update provider exports and buildApiHandler
- Add comprehensive tests for the new provider

This integration allows users to authenticate with Gemini CLI using OAuth
and access Gemini models through the official CLI library.

Author: roomote

package.json

@@ -62,5 +62,8 @@
 			"form-data": ">=4.0.4",
 			"bluebird": ">=3.7.2"
 		}
+	},
+	"dependencies": {
+		"@google/gemini-cli-core": "^0.2.2"
 	}
 }

packages/types/src/provider-settings.ts

@@ -13,6 +13,7 @@ import {
 	featherlessModels,
 	fireworksModels,
 	geminiModels,
+	geminiCliModels,
 	groqModels,
 	ioIntelligenceModels,
 	mistralModels,
@@ -470,7 +471,7 @@ export const getApiProtocol = (provider: ProviderName | undefined, modelId?: str
 }
 
 export const MODELS_BY_PROVIDER: Record<
-	Exclude<ProviderName, "fake-ai" | "human-relay" | "gemini-cli" | "lmstudio" | "openai" | "ollama">,
+	Exclude<ProviderName, "fake-ai" | "human-relay" | "lmstudio" | "openai" | "ollama">,
 	{ id: ProviderName; label: string; models: string[] }
 > = {
 	anthropic: {
@@ -515,6 +516,11 @@ export const MODELS_BY_PROVIDER: Record<
 		label: "Google Gemini",
 		models: Object.keys(geminiModels),
 	},
+	"gemini-cli": {
+		id: "gemini-cli",
+		label: "Google Gemini CLI",
+		models: Object.keys(geminiCliModels),
+	},
 	groq: { id: "groq", label: "Groq", models: Object.keys(groqModels) },
 	"io-intelligence": {
 		id: "io-intelligence",

packages/types/src/providers/gemini-cli.ts

@@ -0,0 +1,54 @@
+import type { ModelInfo } from "../model.js"
+
+// Gemini CLI models - using the same models as regular Gemini
+// The CLI provides access to the same models through OAuth authentication
+export type GeminiCliModelId = keyof typeof geminiCliModels
+
+export const geminiCliDefaultModelId: GeminiCliModelId = "gemini-2.0-flash-001"
+
+// Re-use the same model definitions as the regular Gemini provider
+// since Gemini CLI provides access to the same models
+export const geminiCliModels = {
+	"gemini-2.0-flash-001": {
+		maxTokens: 8192,
+		contextWindow: 1_048_576,
+		supportsImages: true,
+		supportsPromptCache: true,
+		inputPrice: 0.1,
+		outputPrice: 0.4,
+		cacheReadsPrice: 0.025,
+		cacheWritesPrice: 1.0,
+	},
+	"gemini-1.5-flash-002": {
+		maxTokens: 8192,
+		contextWindow: 1_048_576,
+		supportsImages: true,
+		supportsPromptCache: true,
+		inputPrice: 0.15, // This is the pricing for prompts above 128k tokens.
+		outputPrice: 0.6,
+		cacheReadsPrice: 0.0375,
+		cacheWritesPrice: 1.0,
+		tiers: [
+			{
+				contextWindow: 128_000,
+				inputPrice: 0.075,
+				outputPrice: 0.3,
+				cacheReadsPrice: 0.01875,
+			},
+			{
+				contextWindow: Infinity,
+				inputPrice: 0.15,
+				outputPrice: 0.6,
+				cacheReadsPrice: 0.0375,
+			},
+		],
+	},
+	"gemini-1.5-pro-002": {
+		maxTokens: 8192,
+		contextWindow: 2_097_152,
+		supportsImages: true,
+		supportsPromptCache: false,
+		inputPrice: 0,
+		outputPrice: 0,
+	},
+} as const satisfies Record<string, ModelInfo>

packages/types/src/providers/index.ts

@@ -8,6 +8,7 @@ export * from "./doubao.js"
 export * from "./featherless.js"
 export * from "./fireworks.js"
 export * from "./gemini.js"
+export * from "./gemini-cli.js"
 export * from "./glama.js"
 export * from "./groq.js"
 export * from "./huggingface.js"