Fix edge cases with formatNative

Author: cte

packages/core/src/custom-tools/format-native.ts

@@ -3,5 +3,15 @@ import type { OpenAI } from "openai"
 import type { SerializedCustomToolDefinition } from "@roo-code/types"
 
 export function formatNative(tool: SerializedCustomToolDefinition): OpenAI.Chat.ChatCompletionFunctionTool {
-	return { type: "function", function: tool }
+	const { parameters } = tool
+
+	if (parameters) {
+		delete parameters["$schema"]
+
+		if (!parameters.required) {
+			parameters.required = []
+		}
+	}
+
+	return { type: "function", function: { ...tool, strict: true, parameters } }
 }