fix(ai): sanitize Mistral tool schemas closes #3361

packages/ai/src/providers/mistral.ts

@@ -456,12 +456,28 @@ function toFunctionTools(tools: Tool[]): Array<FunctionTool & { type: "function"
 		function: {
 			name: tool.name,
 			description: tool.description,
-			parameters: tool.parameters as unknown as Record<string, unknown>,
+			parameters: stripSymbolKeys(tool.parameters) as Record<string, unknown>,
 			strict: false,
 		},
 	}));
 }
 
+function stripSymbolKeys(value: unknown): unknown {
+	if (Array.isArray(value)) {
+		return value.map((item) => stripSymbolKeys(item));
+	}
+
+	if (value && typeof value === "object") {
+		const result: Record<string, unknown> = {};
+		for (const [key, entry] of Object.entries(value)) {
+			result[key] = stripSymbolKeys(entry);
+		}
+		return result;
+	}
+
+	return value;
+}
+
 function toChatMessages(messages: Message[], supportsImages: boolean): ChatCompletionStreamRequestMessage[] {
 	const result: ChatCompletionStreamRequestMessage[] = [];