MCP Tool Progress Notifications and MCP SDK bump. (#2030)

* bump SDK version

* MCP Tool Progress Notifications

* lint

README.md

@@ -1,5 +1,5 @@
-# Chat UI 
- 
+# Chat UI
+
 ![Chat UI repository thumbnail](https://huggingface.co/datasets/huggingface/documentation-images/resolve/main/chat-ui/chat-ui-2026.png)
 
 A chat interface for LLMs. It is a SvelteKit app and it powers the [HuggingChat app on hf.co/chat](https://huggingface.co/chat).

package-lock.json

@@ -13,7 +13,7 @@
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 				"@huggingface/inference": "^4.11.3",
 				"@iconify-json/bi": "^1.1.21",
-				"@modelcontextprotocol/sdk": "^1.21.1",
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@@ -1072,7 +1073,6 @@
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+			"peerDependencies": {
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@@ -2436,11 +2447,12 @@
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 			"license": "MIT",
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+				"zod": "^3.25 || ^4.0",
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@@ -7171,6 +7185,16 @@
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@@ -7776,6 +7800,15 @@
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 			"license": "MIT",
-			"peer": true,
 			"dependencies": {
 				"@types/chai": "^5.2.2",
 				"@vitest/expect": "3.2.2",
@@ -12544,7 +12577,6 @@
 			"resolved": "https://registry.npmjs.org/ws/-/ws-8.18.2.tgz",
 			"integrity": "sha512-DMricUmwGZUVr++AEAe2uiVM7UoO9MAVZMDu05UQOaUII0lp+zOzLLU4Xqh/JvTqklB1T4uELaaPBKyjE1r4fQ==",
 			"license": "MIT",
-			"peer": true,
 			"engines": {
 				"node": ">=10.0.0"
 			},
@@ -12667,18 +12699,17 @@
 			"resolved": "https://registry.npmjs.org/zod/-/zod-3.25.55.tgz",
 			"integrity": "sha512-219huNnkSLQnLsQ3uaRjXsxMrVm5C9W3OOpEVt2k5tvMKuA8nBSu38e0B//a+he9Iq2dvmk2VyYVlHqiHa4YBA==",
 			"license": "MIT",
-			"peer": true,
 			"funding": {
 				"url": "https://github.com/sponsors/colinhacks"
 			}
 		},
 		"node_modules/zod-to-json-schema": {
-			"version": "3.24.6",
-			"resolved": "https://registry.npmjs.org/zod-to-json-schema/-/zod-to-json-schema-3.24.6.tgz",
-			"integrity": "sha512-h/z3PKvcTcTetyjl1fkj79MHNEjm+HpD6NXheWjzOekY7kV+lwDYnHw+ivHkijnCSMz1yJaWBD9vu/Fcmk+vEg==",
+			"version": "3.25.1",
+			"resolved": "https://registry.npmjs.org/zod-to-json-schema/-/zod-to-json-schema-3.25.1.tgz",
+			"integrity": "sha512-pM/SU9d3YAggzi6MtR4h7ruuQlqKtad8e9S0fmxcMi+ueAK5Korys/aWcV9LIIHTVbj01NdzxcnXSN+O74ZIVA==",
 			"license": "ISC",
 			"peerDependencies": {
-				"zod": "^3.24.1"
+				"zod": "^3.25 || ^4"
 			}
 		}
 	}

package.json

@@ -72,7 +72,7 @@
 		"@huggingface/hub": "^2.2.0",
 		"@huggingface/inference": "^4.11.3",
 		"@iconify-json/bi": "^1.1.21",
-		"@modelcontextprotocol/sdk": "^1.21.1",
+		"@modelcontextprotocol/sdk": "^1.25.1",
 		"@resvg/resvg-js": "^2.6.2",
 		"@sinclair/typebox": "^0.34.41",
 		"autoprefixer": "^10.4.14",

src/lib/components/chat/ToolUpdate.svelte

@@ -3,8 +3,10 @@
 	import {
 		isMessageToolCallUpdate,
 		isMessageToolErrorUpdate,
+		isMessageToolProgressUpdate,
 		isMessageToolResultUpdate,
 	} from "$lib/utils/messageUpdates";
+	import { formatToolProgressLabel } from "$lib/utils/toolProgress";
 	import LucideHammer from "~icons/lucide/hammer";
 	import LucideCheck from "~icons/lucide/check";
 	import { ToolResultStatus, type ToolFront } from "$lib/types/Tool";
@@ -27,6 +29,14 @@
 	let toolDone = $derived(tool.some(isMessageToolResultUpdate));
 	let isExecuting = $derived(!toolDone && !toolError && loading);
 	let toolSuccess = $derived(toolDone && !toolError);
+	let toolProgress = $derived.by(() => {
+		for (let i = tool.length - 1; i >= 0; i -= 1) {
+			const update = tool[i];
+			if (isMessageToolProgressUpdate(update)) return update;
+		}
+		return undefined;
+	});
+	let progressLabel = $derived.by(() => formatToolProgressLabel(toolProgress));
 
 	const availableTools: ToolFront[] = $derived.by(
 		() => (page.data as { tools?: ToolFront[] } | undefined)?.tools ?? []
@@ -120,7 +130,7 @@
 		<div class="flex w-full select-none items-center gap-2">
 			<button
 				type="button"
-				class="flex flex-1 cursor-pointer items-center gap-2 text-left"
+				class="flex flex-1 cursor-pointer flex-col items-start gap-1 text-left"
 				onclick={() => (isOpen = !isOpen)}
 			>
 				<span
@@ -137,6 +147,9 @@
 						{availableTools.find((entry) => entry.name === toolFnName)?.displayName ?? toolFnName}
 					</code>
 				</span>
+				{#if isExecuting && toolProgress}
+					<span class="text-xs text-gray-500 dark:text-gray-400">{progressLabel}</span>
+				{/if}
 			</button>
 
 			<button

src/lib/server/mcp/httpClient.ts

@@ -23,6 +23,12 @@ export type McpToolTextResponse = {
 	content?: unknown[];
 };
 
+export type McpToolProgress = {
+	progress: number;
+	total?: number;
+	message?: string;
+};
+
 export async function callMcpTool(
 	server: McpServerConfig,
 	tool: string,
@@ -31,7 +37,13 @@ export async function callMcpTool(
 		timeoutMs = DEFAULT_TIMEOUT_MS,
 		signal,
 		client,
-	}: { timeoutMs?: number; signal?: AbortSignal; client?: Client } = {}
+		onProgress,
+	}: {
+		timeoutMs?: number;
+		signal?: AbortSignal;
+		client?: Client;
+		onProgress?: (progress: McpToolProgress) => void;
+	} = {}
 ): Promise<McpToolTextResponse> {
 	// Bypass MCP protocol for Exa - call direct API
 	if (isExaServer(server)) {
@@ -61,7 +73,13 @@ export async function callMcpTool(
 		signal,
 		timeout: timeoutMs,
 		// Enable progress tokens so long-running tools keep extending the timeout.
-		onprogress: () => {},
+		onprogress: (progress: McpToolProgress) => {
+			onProgress?.({
+				progress: progress.progress,
+				total: progress.total,
+				message: progress.message,
+			});
+		},
 		resetTimeoutOnProgress: true,
 	};
 

src/lib/server/textGeneration/mcp/toolInvocation.ts

@@ -173,27 +173,42 @@ export async function* executeToolCalls({
 		};
 	}
 
-	const q = createQueue<TaskResult>();
+	const updatesQueue = createQueue<MessageUpdate>();
+	const results: TaskResult[] = [];
 
 	const tasks = prepared.map(async (p, index) => {
 		const mappingEntry = mapping[p.call.name];
 		if (!mappingEntry) {
-			q.push({
+			const message = `Unknown MCP function: ${p.call.name}`;
+			results.push({
 				index,
-				error: `Unknown MCP function: ${p.call.name}`,
+				error: message,
 				uuid: p.uuid,
 				paramsClean: p.paramsClean,
 			});
+			updatesQueue.push({
+				type: MessageUpdateType.Tool,
+				subtype: MessageToolUpdateType.Error,
+				uuid: p.uuid,
+				message,
+			});
 			return;
 		}
 		const serverCfg = serverLookup.get(mappingEntry.server);
 		if (!serverCfg) {
-			q.push({
+			const message = `Unknown MCP server: ${mappingEntry.server}`;
+			results.push({
 				index,
-				error: `Unknown MCP server: ${mappingEntry.server}`,
+				error: message,
 				uuid: p.uuid,
 				paramsClean: p.paramsClean,
 			});
+			updatesQueue.push({
+				type: MessageUpdateType.Tool,
+				subtype: MessageToolUpdateType.Error,
+				uuid: p.uuid,
+				message,
+			});
 			return;
 		}
 		const client = clientMap.get(mappingEntry.server);
@@ -210,6 +225,16 @@ export async function* executeToolCalls({
 					client,
 					signal: abortSignal,
 					timeoutMs: toolTimeoutMs,
+					onProgress: (progress) => {
+						updatesQueue.push({
+							type: MessageUpdateType.Tool,
+							subtype: MessageToolUpdateType.Progress,
+							uuid: p.uuid,
+							progress: progress.progress,
+							total: progress.total,
+							message: progress.message,
+						});
+					},
 				}
 			);
 			const { annotated } = processToolOutput(toolResponse.text ?? "");
@@ -217,7 +242,7 @@ export async function* executeToolCalls({
 				{ server: mappingEntry.server, tool: mappingEntry.tool },
 				"[mcp] tool call completed"
 			);
-			q.push({
+			results.push({
 				index,
 				output: annotated,
 				structured: toolResponse.structured,
@@ -225,54 +250,44 @@ export async function* executeToolCalls({
 				uuid: p.uuid,
 				paramsClean: p.paramsClean,
 			});
+			updatesQueue.push({
+				type: MessageUpdateType.Tool,
+				subtype: MessageToolUpdateType.Result,
+				uuid: p.uuid,
+				result: {
+					status: ToolResultStatus.Success,
+					call: { name: p.call.name, parameters: p.paramsClean },
+					outputs: [
+						{
+							text: annotated ?? "",
+							structured: toolResponse.structured,
+							content: toolResponse.content,
+						} as unknown as Record<string, unknown>,
+					],
+					display: true,
+				},
+			});
 		} catch (err) {
 			const message = err instanceof Error ? err.message : String(err);
 			logger.warn(
 				{ server: mappingEntry.server, tool: mappingEntry.tool, err: message },
 				"[mcp] tool call failed"
 			);
-			q.push({ index, error: message, uuid: p.uuid, paramsClean: p.paramsClean });
+			results.push({ index, error: message, uuid: p.uuid, paramsClean: p.paramsClean });
+			updatesQueue.push({
+				type: MessageUpdateType.Tool,
+				subtype: MessageToolUpdateType.Error,
+				uuid: p.uuid,
+				message,
+			});
 		}
 	});
 
 	// kick off and stream as they finish
-	Promise.allSettled(tasks).then(() => q.close());
+	Promise.allSettled(tasks).then(() => updatesQueue.close());
 
-	const results: TaskResult[] = [];
-	for await (const r of q.iterator()) {
-		results.push(r);
-		if (r.error) {
-			yield {
-				type: "update",
-				update: {
-					type: MessageUpdateType.Tool,
-					subtype: MessageToolUpdateType.Error,
-					uuid: r.uuid,
-					message: r.error,
-				},
-			};
-		} else {
-			yield {
-				type: "update",
-				update: {
-					type: MessageUpdateType.Tool,
-					subtype: MessageToolUpdateType.Result,
-					uuid: r.uuid,
-					result: {
-						status: ToolResultStatus.Success,
-						call: { name: prepared[r.index].call.name, parameters: r.paramsClean },
-						outputs: [
-							{
-								text: r.output ?? "",
-								structured: r.structured,
-								content: r.blocks,
-							} as unknown as Record<string, unknown>,
-						],
-						display: true,
-					},
-				},
-			};
-		}
+	for await (const update of updatesQueue.iterator()) {
+		yield { type: "update", update };
 	}
 
 	// Collate outputs in original call order

src/lib/types/MessageUpdate.ts

@@ -54,6 +54,7 @@ export enum MessageToolUpdateType {
 	Result = "result",
 	Error = "error",
 	ETA = "eta",
+	Progress = "progress",
 }
 
 interface MessageToolUpdateBase<TSubtype extends MessageToolUpdateType> {
@@ -79,11 +80,19 @@ export interface MessageToolEtaUpdate extends MessageToolUpdateBase<MessageToolU
 	eta: number;
 }
 
+export interface MessageToolProgressUpdate
+	extends MessageToolUpdateBase<MessageToolUpdateType.Progress> {
+	progress: number;
+	total?: number;
+	message?: string;
+}
+
 export type MessageToolUpdate =
 	| MessageToolCallUpdate
 	| MessageToolResultUpdate
 	| MessageToolErrorUpdate
-	| MessageToolEtaUpdate;
+	| MessageToolEtaUpdate
+	| MessageToolProgressUpdate;
 
 export enum MessageReasoningUpdateType {
 	Stream = "stream",

src/lib/utils/messageUpdates.ts

@@ -6,6 +6,7 @@ import {
 	type MessageToolCallUpdate,
 	type MessageToolResultUpdate,
 	type MessageToolErrorUpdate,
+	type MessageToolProgressUpdate,
 	MessageUpdateType,
 	MessageToolUpdateType,
 } from "$lib/types/MessageUpdate";
@@ -265,6 +266,11 @@ export const isMessageToolResultUpdate = (
 export const isMessageToolErrorUpdate = (update: MessageUpdate): update is MessageToolErrorUpdate =>
 	isMessageToolUpdate(update) && update.subtype === MessageToolUpdateType.Error;
 
+export const isMessageToolProgressUpdate = (
+	update: MessageUpdate
+): update is MessageToolProgressUpdate =>
+	isMessageToolUpdate(update) && update.subtype === MessageToolUpdateType.Progress;
+
 const sleep = (ms: number) => new Promise((resolve) => setTimeout(resolve, ms));
 const waitForEvent = (eventTarget: EventTarget, eventName: string) =>
 	new Promise<boolean>((resolve) =>

src/lib/utils/toolProgress.spec.ts

@@ -0,0 +1,46 @@
+import { describe, expect, test } from "vitest";
+
+import { MessageToolUpdateType, MessageUpdateType } from "$lib/types/MessageUpdate";
+import { formatToolProgressLabel } from "./toolProgress";
+
+describe("formatToolProgressLabel", () => {
+	test("returns empty string when progress is missing", () => {
+		expect(formatToolProgressLabel(undefined)).toBe("");
+	});
+
+	test("formats progress with message", () => {
+		expect(
+			formatToolProgressLabel({
+				type: MessageUpdateType.Tool,
+				subtype: MessageToolUpdateType.Progress,
+				uuid: "tool-1",
+				progress: 3,
+				total: 10,
+				message: "Indexing",
+			})
+		).toBe("Indexing (3/10)");
+	});
+
+	test("formats progress without message", () => {
+		expect(
+			formatToolProgressLabel({
+				type: MessageUpdateType.Tool,
+				subtype: MessageToolUpdateType.Progress,
+				uuid: "tool-2",
+				progress: 7,
+			})
+		).toBe("Progress: 7");
+	});
+
+	test("formats progress with message and no total", () => {
+		expect(
+			formatToolProgressLabel({
+				type: MessageUpdateType.Tool,
+				subtype: MessageToolUpdateType.Progress,
+				uuid: "tool-3",
+				progress: 12,
+				message: "ZeroGPU Initializing xxx",
+			})
+		).toBe("ZeroGPU Initializing xxx (12)");
+	});
+});

src/lib/utils/toolProgress.ts

@@ -0,0 +1,11 @@
+import type { MessageToolProgressUpdate } from "$lib/types/MessageUpdate";
+
+export function formatToolProgressLabel(progress?: MessageToolProgressUpdate): string {
+	if (!progress) return "";
+	const total = typeof progress.total === "number" ? `/${progress.total}` : "";
+	const value = `${progress.progress}${total}`;
+	if (progress.message && progress.message.trim().length > 0) {
+		return `${progress.message} (${value})`;
+	}
+	return `Progress: ${value}`;
+}