Added support for Gemini models

src/constants.js

@@ -84,6 +84,40 @@ export const MAX_WAIT_BEFORE_ERROR_MS = 120000; // 2 minutes - throw error if wa
 // Thinking model constants
 export const MIN_SIGNATURE_LENGTH = 50; // Minimum valid thinking signature length
 
+// Gemini-specific limits
+export const GEMINI_MAX_OUTPUT_TOKENS = 16384;
+
+/**
+ * Get the model family from model name (dynamic detection, no hardcoded list).
+ * @param {string} modelName - The model name from the request
+ * @returns {'claude' | 'gemini' | 'unknown'} The model family
+ */
+export function getModelFamily(modelName) {
+    const lower = (modelName || '').toLowerCase();
+    if (lower.includes('claude')) return 'claude';
+    if (lower.includes('gemini')) return 'gemini';
+    return 'unknown';
+}
+
+/**
+ * Check if a model supports thinking/reasoning output.
+ * @param {string} modelName - The model name from the request
+ * @returns {boolean} True if the model supports thinking blocks
+ */
+export function isThinkingModel(modelName) {
+    const lower = (modelName || '').toLowerCase();
+    // Claude thinking models have "thinking" in the name
+    if (lower.includes('claude') && lower.includes('thinking')) return true;
+    // Gemini thinking models: explicit "thinking" in name, OR gemini version 3+
+    if (lower.includes('gemini')) {
+        if (lower.includes('thinking')) return true;
+        // Check for gemini-3 or higher (e.g., gemini-3, gemini-3.5, gemini-4, etc.)
+        const versionMatch = lower.match(/gemini-(\d+)/);
+        if (versionMatch && parseInt(versionMatch[1], 10) >= 3) return true;
+    }
+    return false;
+}
+
 // Google OAuth configuration (from opencode-antigravity-auth)
 export const OAUTH_CONFIG = {
     clientId: '1071006060591-tmhssin2h21lcre235vtolojh4g403ep.apps.googleusercontent.com',
@@ -117,6 +151,9 @@ export default {
     MAX_ACCOUNTS,
     MAX_WAIT_BEFORE_ERROR_MS,
     MIN_SIGNATURE_LENGTH,
+    GEMINI_MAX_OUTPUT_TOKENS,
+    getModelFamily,
+    isThinkingModel,
     OAUTH_CONFIG,
     OAUTH_REDIRECT_URI
 };