Revert "fix(ai): own Anthropic SSE parsing to avoid SDK JSON.parse hard-failures"

This reverts commit 4b926a30a2.

packages/ai/test/anthropic-sse-parsing.test.ts

@@ -1,113 +0,0 @@
-import type Anthropic from "@anthropic-ai/sdk";
-import { Type } from "@sinclair/typebox";
-import { describe, expect, it } from "vitest";
-import { getModel } from "../src/models.js";
-import { streamAnthropic } from "../src/providers/anthropic.js";
-import type { Context, ToolCall } from "../src/types.js";
-
-function createSseResponse(events: Array<{ event: string; data: string }>): Response {
-	const body = events.map(({ event, data }) => `event: ${event}\ndata: ${data}\n`).join("\n");
-	return new Response(body, {
-		status: 200,
-		headers: { "content-type": "text/event-stream" },
-	});
-}
-
-function createFakeAnthropicClient(response: Response): Anthropic {
-	return {
-		messages: {
-			create: () => ({
-				asResponse: async () => response,
-			}),
-		},
-	} as unknown as Anthropic;
-}
-
-describe("Anthropic raw SSE parsing", () => {
-	it("repairs malformed SSE JSON and malformed streamed tool JSON", async () => {
-		const model = getModel("anthropic", "claude-haiku-4-5");
-		const context: Context = {
-			messages: [{ role: "user", content: "Use the edit tool.", timestamp: Date.now() }],
-			tools: [
-				{
-					name: "edit",
-					description: "Edit a file.",
-					parameters: Type.Object({
-						path: Type.String(),
-						text: Type.String(),
-					}),
-				},
-			],
-		};
-
-		const malformedToolJsonDelta = String.raw`{"type":"content_block_delta","index":0,"delta":{"type":"input_json_delta","partial_json":"{\"path\":\"A\H\",\"text\":\"col1	col2\"}"}}`;
-
-		const response = createSseResponse([
-			{
-				event: "message_start",
-				data: JSON.stringify({
-					type: "message_start",
-					message: {
-						id: "msg_test",
-						usage: {
-							input_tokens: 12,
-							output_tokens: 0,
-							cache_read_input_tokens: 0,
-							cache_creation_input_tokens: 0,
-						},
-					},
-				}),
-			},
-			{
-				event: "content_block_start",
-				data: JSON.stringify({
-					type: "content_block_start",
-					index: 0,
-					content_block: {
-						type: "tool_use",
-						id: "toolu_test",
-						name: "edit",
-						input: {},
-					},
-				}),
-			},
-			{ event: "content_block_delta", data: malformedToolJsonDelta },
-			{
-				event: "content_block_stop",
-				data: JSON.stringify({ type: "content_block_stop", index: 0 }),
-			},
-			{
-				event: "message_delta",
-				data: JSON.stringify({
-					type: "message_delta",
-					delta: { stop_reason: "tool_use" },
-					usage: {
-						input_tokens: 12,
-						output_tokens: 5,
-						cache_read_input_tokens: 0,
-						cache_creation_input_tokens: 0,
-					},
-				}),
-			},
-			{
-				event: "message_stop",
-				data: JSON.stringify({ type: "message_stop" }),
-			},
-		]);
-
-		const stream = streamAnthropic(model, context, {
-			client: createFakeAnthropicClient(response),
-		});
-		const result = await stream.result();
-
-		expect(result.stopReason).toBe("toolUse");
-		expect(result.errorMessage).toBeUndefined();
-
-		const toolCall = result.content.find((block): block is ToolCall => block.type === "toolCall");
-		expect(toolCall).toBeDefined();
-		expect(toolCall?.arguments).toEqual({
-			path: "A\\H",
-			text: "col1\tcol2",
-		});
-	});
-});