Remove provider-level tool validation, add validateToolCall helper

packages/ai/src/providers/openai-completions.ts

@@ -23,7 +23,7 @@ import type {
 import { AssistantMessageEventStream } from "../utils/event-stream.js";
 import { parseStreamingJson } from "../utils/json-parse.js";
 import { sanitizeSurrogates } from "../utils/sanitize-unicode.js";
-import { validateToolArguments } from "../utils/validation.js";
+
 import { transformMessages } from "./transorm-messages.js";
 
 export interface OpenAICompletionsOptions extends StreamOptions {
@@ -37,7 +37,6 @@ export const streamOpenAICompletions: StreamFunction<"openai-completions"> = (
 	options?: OpenAICompletionsOptions,
 ): AssistantMessageEventStream => {
 	const stream = new AssistantMessageEventStream();
-	const shouldValidateToolCalls = options?.validateToolCallsAtProvider !== false;
 
 	(async () => {
 		const output: AssistantMessage = {
@@ -85,15 +84,6 @@ export const streamOpenAICompletions: StreamFunction<"openai-completions"> = (
 						});
 					} else if (block.type === "toolCall") {
 						block.arguments = JSON.parse(block.partialArgs || "{}");
-
-						// Validate tool arguments if tool definition is available
-						if (shouldValidateToolCalls && context.tools) {
-							const tool = context.tools.find((t) => t.name === block.name);
-							if (tool) {
-								block.arguments = validateToolArguments(tool, block);
-							}
-						}
-
 						delete block.partialArgs;
 						stream.push({
 							type: "toolcall_end",