Gemini vercel ai sdk adapter (#56)

* vercel ai adpater for gemini cli

* tests fixed based upon v5

* remove logic for normalisation for openai (not needed)

* tests fixed based upon v5

Author: shivammittal274

bun.lock

@@ -50,9 +50,11 @@
     "commander": "^14.0.1",
     "core-js": "3.45.1",
     "debug": "4.4.3",
+    "hono": "^4.10.6",
     "mitt": "^3.0.1",
     "proxy-agent": "^6.5.0",
     "puppeteer-core": "24.23.0",
+    "semver": "^7.7.3",
     "smol-toml": "^1.4.2"
   },
   "devDependencies": {

package.json

@@ -28,10 +28,19 @@
   "author": "",
   "license": "MIT",
   "dependencies": {
-    "@browseros/tools": "workspace:*",
+    "@ai-sdk/amazon-bedrock": "^3.0.59",
+    "@ai-sdk/anthropic": "^2.0.47",
+    "@ai-sdk/azure": "^2.0.74",
+    "@ai-sdk/google": "^2.0.43",
+    "@ai-sdk/openai": "^2.0.72",
+    "@ai-sdk/openai-compatible": "^1.0.27",
+    "@anthropic-ai/claude-agent-sdk": "^0.1.11",
     "@browseros/common": "workspace:*",
     "@browseros/server": "workspace:*",
-    "@anthropic-ai/claude-agent-sdk": "^0.1.11",
+    "@browseros/tools": "workspace:*",
+    "@google/gemini-cli-core": "^0.16.0",
+    "@openrouter/ai-sdk-provider": "~1.2.5",
+    "ai": "^5.0.101",
     "zod": "^4.1.12"
   },
   "devDependencies": {

packages/agent/package.json

@@ -0,0 +1,68 @@
+/**
+ * @license
+ * Copyright 2025 Google LLC
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+/**
+ * Conversion error with structured details
+ */
+
+/**
+ * Structured error compatible with Gemini CLI error handling
+ */
+export interface StructuredError {
+  message: string;
+  status?: number;
+}
+
+export interface ConversionErrorDetails {
+  /** Stage where conversion failed */
+  stage: 'tool' | 'message' | 'response' | 'stream';
+
+  /** Specific operation that failed */
+  operation: string;
+
+  /** Input that caused the failure (sanitized, no secrets) */
+  input?: unknown;
+
+  /** Underlying error if available */
+  cause?: Error;
+
+  /** Additional context for debugging */
+  context?: Record<string, unknown>;
+}
+
+export class ConversionError extends Error {
+  constructor(
+    message: string,
+    readonly details: ConversionErrorDetails,
+  ) {
+    super(message);
+    this.name = 'ConversionError';
+
+    // Maintain proper stack trace
+    if (Error.captureStackTrace) {
+      Error.captureStackTrace(this, ConversionError);
+    }
+  }
+
+  /**
+   * Convert to StructuredError for Gemini CLI error handling
+   */
+  toStructuredError(): StructuredError {
+    return {
+      message: `[${this.details.stage}] ${this.details.operation}: ${this.message}`,
+      status: 500,
+    };
+  }
+
+  /**
+   * Get user-friendly error message
+   */
+  toFriendlyMessage(): string {
+    const stage =
+      this.details.stage.charAt(0).toUpperCase() + this.details.stage.slice(1);
+    return `${stage} conversion failed: ${this.message}`;
+  }
+}