feat: Decrease AI Builder wordiness (no-changelog) (#18920)

packages/@n8n/ai-workflow-builder.ee/evaluations/README.md

@@ -161,6 +161,7 @@ The AI Workflow Builder agent needs access to node definitions to generate workf
 1. Run your n8n instance
 2. Download the node definitions from locally running n8n instance(http://localhost:5678/types/nodes.json)
 3. Save the node definitions to `evaluations/nodes.json`
+` curl -o evaluations/nodes.json http://localhost:5678/types/nodes.json`
 
 The evaluation will fail with a clear error message if `nodes.json` is missing.
 

packages/@n8n/ai-workflow-builder.ee/src/tools/add-node.tool.ts

@@ -13,7 +13,7 @@ import { findNodeType } from './helpers/validation';
 import type { AddedNode } from '../types/nodes';
 import type { AddNodeOutput, ToolError } from '../types/tools';
 
-const DISPLAY_TITLE = 'Adding node';
+const DISPLAY_TITLE = 'Adding nodes';
 
 /**
  * Schema for node creation input
@@ -77,7 +77,8 @@ function getCustomNodeTitle(
 		}
 	}
 
-	return DISPLAY_TITLE;
+	// single "node" not plural "nodes" because this pertains to this specific tool call
+	return 'Adding node';
 }
 
 /**

packages/@n8n/ai-workflow-builder.ee/src/tools/prompts/main-agent.prompt.ts

@@ -3,26 +3,21 @@ import { ChatPromptTemplate } from '@langchain/core/prompts';
 import { instanceUrlPrompt } from '@/chains/prompts/instance-url';
 
 const systemPrompt = `You are an AI assistant specialized in creating and editing n8n workflows. Your goal is to help users build efficient, well-connected workflows by intelligently using the available tools.
-
-<prime_directive>
-ALWAYS end your workflow mutation responses with a brief note that the workflow can be adjusted if needed. For example: "Feel free to let me know if you'd like to adjust any part of this workflow!" This is mandatory for all workflow mutation responses.
-</prime_directive>
-
 <core_principle>
 After receiving tool results, reflect on their quality and determine optimal next steps. Use this reflection to plan your approach and ensure all nodes are properly configured and connected.
 </core_principle>
 
 <communication_style>
-Be warm, helpful, and most importantlyconcise. Focus on actionable information.
-- Lead with what was accomplished
-- Highlight only critical configuration needs
-- Provide clear next steps
-- Save detailed explanations for when users ask
-- One emoji per section maximum
+Keep responses concise.
+
+CRITICAL: Do NOT provide commentary between tool calls. Execute tools silently.
+- NO progress messages like "Perfect!", "Now let me...", "Excellent!"
+- NO descriptions of what was built or how it works
+- NO workflow features or capabilities explanations
+- Only respond AFTER all tools are complete
+- Response should only contain setup/usage information
 </communication_style>
 
-<tool_execution_strategy>
-For maximum efficiency, invoke all relevant tools simultaneously when performing independent operations. This significantly reduces wait time and improves user experience.
 
 Parallel execution guidelines:
 - ALL tools support parallel execution, including add_nodes
@@ -316,7 +311,7 @@ When unsure about specific values:
 - Add nodes and connections confidently
 - For uncertain parameters, use update_node_parameters with clear placeholders
 - For tool nodes with dynamic values, use $fromAI expressions instead of placeholders
-- Always mention what needs user input in your response
+- Always mention what needs user to configure in the setup response
 
 Example for regular nodes:
 update_node_parameters({{
@@ -329,41 +324,30 @@ update_node_parameters({{
   nodeId: "gmailTool1",
   instructions: ["Set sendTo to {{ $fromAI('to') }}", "Set subject to {{ $fromAI('subject') }}"]
 }})
-
-Then tell the user: "I've set up the Gmail Tool node with dynamic AI parameters - it will automatically determine recipients and subjects based on context."
 </handling_uncertainty>
 
 `;
 
 const responsePatterns = `
 <response_patterns>
-After completing workflow tasks, follow this structure:
+IMPORTANT: Only provide ONE response AFTER all tool execution is complete.
 
-1. **Brief Summary** (1-2 sentences)
-   State what was created/modified without listing every parameter
+Response format:
+**⚙️ How to Setup** (numbered format)
+- List credentials and parameters that need to configured
+- Only list incomplete tasks that need user action (skip what's already configured)
 
-2. **Key Requirements** (if any)
-   - Credentials needed
-   - Parameters the user should verify
-   - Any manual configuration required
+**ℹ️ How to Use**
+- Only essential user actions (what to click, where to go)
 
-3. **How to Use** (when relevant)
-   Quick steps to get started
+End with: "Let me know if you'd like to adjust anything."
 
-4. **Next Steps** (if applicable)
-   What the user might want to do next
-
-<communication_style>
-Be warm, helpful, and most importantly concise. Focus on actionable information.
-- Lead with what was accomplished
-- Provide clear next steps
-- Highlight only critical configuration needs
-- Be warm and encouraging without excessive enthusiasm
-- Use emojis sparingly (1-2 max per response)
-- Focus on what the user needs to know
-- Expand details only when asked
-- End with a brief note that the workflow can be adjusted if needed
-</communication_style>
+ABSOLUTELY FORBIDDEN IN BUILDING MODE:
+- Any text between tool calls
+- Progress updates during execution
+- "Perfect!", "Now let me...", "Excellent!"
+- Describing what was built
+- Explaining workflow functionality
 </response_patterns>
 `;
 

packages/@n8n/ai-workflow-builder.ee/src/utils/stream-processor.ts

@@ -59,6 +59,7 @@ export function processStreamChunk(streamMode: string, chunk: unknown): StreamOu
 		if ((agentChunk?.compact_messages?.messages ?? []).length > 0) {
 			const lastMessage =
 				agentChunk.compact_messages!.messages![agentChunk.compact_messages!.messages!.length - 1];
+
 			const messageChunk: AgentMessageChunk = {
 				role: 'assistant',
 				type: 'message',
@@ -83,13 +84,17 @@ export function processStreamChunk(streamMode: string, chunk: unknown): StreamOu
 					content = lastMessage.content;
 				}
 
-				const messageChunk: AgentMessageChunk = {
-					role: 'assistant',
-					type: 'message',
-					text: content,
-				};
+				if (content) {
+					const messageChunk: AgentMessageChunk = {
+						role: 'assistant',
+						type: 'message',
+						text: content,
+					};
 
-				return { messages: [messageChunk] };
+					return { messages: [messageChunk] };
+				}
+
+				return null;
 			}
 		}
 

packages/@n8n/ai-workflow-builder.ee/src/utils/test/stream-processor.test.ts

@@ -86,6 +86,18 @@ describe('stream-processor', () => {
 				expect(message.text).toBe('Last message to display');
 			});
 
+			it('should handle compact_messages with empty content', () => {
+				const chunk = {
+					agent: {
+						messages: [{ content: 'First message' }, { content: [{ type: 'text', text: '' }] }],
+					},
+				};
+
+				const result = processStreamChunk('updates', chunk);
+
+				expect(result).toEqual(null);
+			});
+
 			it('should handle process_operations with workflow update', () => {
 				const workflowData = {
 					nodes: [{ id: 'node1', name: 'Test Node' }],

packages/frontend/@n8n/design-system/src/components/AskAssistantChat/AskAssistantChat.test.ts

@@ -1,9 +1,8 @@
 import { render } from '@testing-library/vue';
 import { vi } from 'vitest';
 
-import { n8nHtml } from '@n8n/design-system/directives';
-
 import AskAssistantChat from './AskAssistantChat.vue';
+import { n8nHtml } from '../../directives';
 import type { Props as MessageWrapperProps } from './messages/MessageWrapper.vue';
 import type { ChatUI } from '../../types/assistant';
 
@@ -388,6 +387,70 @@ describe('AskAssistantChat', () => {
 			});
 		});
 
+		it('should collapse tool messages with same toolName with hidden messages in between', () => {
+			const messages: Array<ChatUI.AssistantMessage & { id: string }> = [
+				createToolMessage({
+					id: '1',
+					status: 'running',
+					displayTitle: 'Searching...',
+					updates: [{ type: 'progress', data: { status: 'Initializing search' } }],
+				}),
+				{
+					id: '2',
+					role: 'assistant',
+					type: 'agent-suggestion',
+					title: 'Agent Suggestion',
+					content: 'This is a suggestion from the agent',
+					suggestionId: 'test',
+					quickReplies: [
+						{ type: 'accept', text: 'Accept suggestion' },
+						{ type: 'reject', text: 'Reject suggestion' },
+					],
+					read: true,
+				},
+				createToolMessage({
+					id: '2',
+					status: 'running',
+					displayTitle: 'Still searching...',
+					customDisplayTitle: 'Custom Search Title',
+					updates: [{ type: 'progress', data: { status: 'Processing results' } }],
+				}),
+				{
+					id: 'test',
+					role: 'assistant',
+					type: 'workflow-updated',
+					codeSnippet: '',
+				},
+				createToolMessage({
+					id: '3',
+					status: 'completed',
+					displayTitle: 'Search Complete',
+					updates: [{ type: 'output', data: { result: 'Found 10 items' } }],
+				}),
+			];
+
+			renderWithMessages(messages);
+
+			expectMessageWrapperCalledTimes(1);
+			const props = getMessageWrapperProps();
+
+			expectToolMessage(props, {
+				id: '3',
+				role: 'assistant',
+				type: 'tool',
+				toolName: 'search',
+				status: 'running',
+				displayTitle: 'Still searching...',
+				customDisplayTitle: 'Custom Search Title',
+				updates: [
+					{ type: 'progress', data: { status: 'Initializing search' } },
+					{ type: 'progress', data: { status: 'Processing results' } },
+					{ type: 'output', data: { result: 'Found 10 items' } },
+				],
+				read: true,
+			});
+		});
+
 		it('should not collapse tool messages with different toolNames', () => {
 			const messages = [
 				createToolMessage({
@@ -738,4 +801,184 @@ describe('AskAssistantChat', () => {
 			);
 		});
 	});
+
+	describe('Quick Replies', () => {
+		const renderWithQuickReplies = (
+			messages: ChatUI.AssistantMessage[],
+			streaming = false,
+			loadingMessage?: string,
+		) => {
+			return render(AskAssistantChat, {
+				global: {
+					directives: { n8nHtml },
+					stubs: {
+						...Object.fromEntries(stubs.map((stub) => [stub, true])),
+						'n8n-button': { template: '<button><slot></button' },
+					},
+				},
+				props: {
+					user: { firstName: 'Kobi', lastName: 'Dog' },
+					messages,
+					streaming,
+					loadingMessage,
+				},
+			});
+		};
+
+		it('should render quick replies for code-diff message', () => {
+			const messages: ChatUI.AssistantMessage[] = [
+				{
+					id: '1',
+					role: 'assistant',
+					type: 'text',
+					content: 'Here is a solution',
+					read: true,
+				},
+				{
+					id: '2',
+					role: 'assistant',
+					type: 'code-diff',
+					description: 'Code solution',
+					codeDiff: 'diff content',
+					suggestionId: 'test',
+					quickReplies: [
+						{ type: 'new-suggestion', text: 'Give me another solution' },
+						{ type: 'resolved', text: 'All good' },
+					],
+					read: true,
+				},
+			];
+
+			const wrapper = renderWithQuickReplies(messages);
+
+			// Quick replies should be rendered (2 buttons found)
+			expect(wrapper.queryAllByTestId('quick-replies')).toHaveLength(2);
+			// Quick reply title should be visible
+			expect(wrapper.container.textContent).toContain('Quick reply');
+			expect(wrapper.container).toHaveTextContent('Give me another solution');
+			expect(wrapper.container).toHaveTextContent('All good');
+		});
+
+		it('should render quick replies for agent-suggestion messages', () => {
+			const messages: ChatUI.AssistantMessage[] = [
+				{
+					id: '1',
+					role: 'assistant',
+					type: 'text',
+					content: 'Here is a solution',
+					read: true,
+				},
+				{
+					id: '2',
+					role: 'assistant',
+					type: 'agent-suggestion',
+					title: 'Agent Suggestion',
+					content: 'This is a suggestion from the agent',
+					suggestionId: 'test',
+					quickReplies: [
+						{ type: 'accept', text: 'Accept suggestion' },
+						{ type: 'reject', text: 'Reject suggestion' },
+					],
+					read: true,
+				},
+			];
+
+			const wrapper = renderWithQuickReplies(messages);
+
+			// Quick replies should still be rendered even though agent-suggestion is filtered out
+			expect(wrapper.queryAllByTestId('quick-replies')).toHaveLength(2);
+			// Quick reply title should be visible
+			expect(wrapper.container.textContent).toContain('Quick reply');
+
+			expect(wrapper.container).toHaveTextContent('Accept suggestion');
+			expect(wrapper.container).toHaveTextContent('Reject suggestion');
+		});
+
+		it('should not render quick replies when streaming', () => {
+			const messages: ChatUI.AssistantMessage[] = [
+				{
+					id: '1',
+					role: 'assistant',
+					type: 'code-diff',
+					description: 'Code solution',
+					codeDiff: 'diff content',
+					suggestionId: 'test',
+					quickReplies: [{ type: 'new-suggestion', text: 'Give me another solution' }],
+					read: true,
+				},
+			];
+
+			const wrapper = renderWithQuickReplies(messages, true);
+
+			expect(wrapper.queryAllByTestId('quick-replies')).toHaveLength(0);
+			expect(wrapper.container.textContent).not.toContain('Quick reply');
+			expect(wrapper.container.textContent).not.toContain('Give me another solution');
+		});
+
+		it('should not render quick replies for non-last messages', () => {
+			const messages: ChatUI.AssistantMessage[] = [
+				{
+					id: '1',
+					role: 'assistant',
+					type: 'code-diff',
+					description: 'Code solution',
+					codeDiff: 'diff content',
+					suggestionId: 'test',
+					quickReplies: [{ type: 'new-suggestion', text: 'Give me another solution' }],
+					read: true,
+				},
+				{
+					id: '2',
+					role: 'assistant',
+					type: 'text',
+					content: 'Follow up message',
+					read: true,
+				},
+			];
+
+			const wrapper = renderWithQuickReplies(messages);
+
+			// Quick replies should not be rendered since the message with quick replies is not last
+			expect(wrapper.queryAllByTestId('quick-replies')).toHaveLength(0);
+			expect(wrapper.container.textContent).not.toContain('Quick reply');
+			expect(wrapper.container.textContent).not.toContain('Give me another solution');
+		});
+
+		it('should not render quick replies when last message has no quickReplies', () => {
+			const messages: ChatUI.AssistantMessage[] = [
+				{
+					id: '1',
+					role: 'assistant',
+					type: 'text',
+					content: 'Simple text message',
+					read: true,
+				},
+			];
+
+			const wrapper = renderWithQuickReplies(messages);
+
+			expect(wrapper.queryAllByTestId('quick-replies')).toHaveLength(0);
+			expect(wrapper.container.textContent).not.toContain('Quick reply');
+		});
+
+		it('should not render quick replies when last message has empty quickReplies array', () => {
+			const messages: ChatUI.AssistantMessage[] = [
+				{
+					id: '1',
+					role: 'assistant',
+					type: 'code-diff',
+					description: 'Code solution',
+					codeDiff: 'diff content',
+					suggestionId: 'test',
+					quickReplies: [],
+					read: true,
+				},
+			];
+
+			const wrapper = renderWithQuickReplies(messages);
+
+			expect(wrapper.queryAllByTestId('quick-replies')).toHaveLength(0);
+			expect(wrapper.container.textContent).not.toContain('Quick reply');
+		});
+	});
 });

packages/frontend/@n8n/design-system/src/components/AskAssistantChat/AskAssistantChat.vue

@@ -11,6 +11,7 @@ import AssistantText from '../AskAssistantText/AssistantText.vue';
 import InlineAskAssistantButton from '../InlineAskAssistantButton/InlineAskAssistantButton.vue';
 import N8nButton from '../N8nButton';
 import N8nIcon from '../N8nIcon';
+import { getSupportedMessageComponent } from './messages/helpers';
 
 const { t } = useI18n();
 
@@ -63,6 +64,11 @@ function normalizeMessages(messages: ChatUI.AssistantMessage[]): ChatUI.Assistan
 	}));
 }
 
+// filter out these messages so that tool collapsing works correctly
+function filterOutHiddenMessages(messages: ChatUI.AssistantMessage[]): ChatUI.AssistantMessage[] {
+	return messages.filter((message) => Boolean(getSupportedMessageComponent(message.type)));
+}
+
 function collapseToolMessages(messages: ChatUI.AssistantMessage[]): ChatUI.AssistantMessage[] {
 	const result: ChatUI.AssistantMessage[] = [];
 	let i = 0;
@@ -136,7 +142,17 @@ function collapseToolMessages(messages: ChatUI.AssistantMessage[]): ChatUI.Assis
 // Ensure all messages have required id and read properties, and collapse tool messages
 const normalizedMessages = computed(() => {
 	const normalized = normalizeMessages(props.messages);
-	return collapseToolMessages(normalized);
+	return collapseToolMessages(filterOutHiddenMessages(normalized));
+});
+
+// Get quickReplies from the last message in the original messages (before filtering)
+const lastMessageQuickReplies = computed(() => {
+	if (!props.messages?.length || props.streaming) return [];
+
+	const lastMessage = props.messages[props.messages.length - 1];
+	return 'quickReplies' in lastMessage && lastMessage.quickReplies?.length
+		? lastMessage.quickReplies
+		: [];
 });
 
 const textInputValue = ref<string>('');
@@ -252,18 +268,17 @@ watch(
 						/>
 
 						<div
-							v-if="
-								!streaming &&
-								'quickReplies' in message &&
-								message.quickReplies?.length &&
-								i === normalizedMessages.length - 1
-							"
+							v-if="lastMessageQuickReplies.length && i === normalizedMessages.length - 1"
 							:class="$style.quickReplies"
 						>
 							<div :class="$style.quickRepliesTitle">
 								{{ t('assistantChat.quickRepliesTitle') }}
 							</div>
-							<div v-for="opt in message.quickReplies" :key="opt.type" data-test-id="quick-replies">
+							<div
+								v-for="opt in lastMessageQuickReplies"
+								:key="opt.type"
+								data-test-id="quick-replies"
+							>
 								<N8nButton
 									v-if="opt.text"
 									type="secondary"

packages/frontend/@n8n/design-system/src/components/AskAssistantChat/messages/MessageWrapper.vue

@@ -3,12 +3,7 @@
 <script setup lang="ts">
 import { computed, type Component } from 'vue';
 
-import BlockMessage from './BlockMessage.vue';
-import CodeDiffMessage from './CodeDiffMessage.vue';
-import ErrorMessage from './ErrorMessage.vue';
-import EventMessage from './EventMessage.vue';
-import TextMessage from './TextMessage.vue';
-import ToolMessage from './ToolMessage.vue';
+import { getSupportedMessageComponent } from './helpers';
 import type { ChatUI, RatingFeedback } from '../../../types/assistant';
 
 export interface Props {
@@ -31,25 +26,7 @@ const emit = defineEmits<{
 }>();
 
 const messageComponent = computed<Component | null>(() => {
-	switch (props.message.type) {
-		case 'text':
-			return TextMessage;
-		case 'block':
-			return BlockMessage;
-		case 'code-diff':
-			return CodeDiffMessage;
-		case 'error':
-			return ErrorMessage;
-		case 'event':
-			return EventMessage;
-		case 'tool':
-			return ToolMessage;
-		case 'agent-suggestion':
-		case 'workflow-updated':
-			return null;
-		default:
-			return null;
-	}
+	return getSupportedMessageComponent(props.message.type);
 });
 </script>
 

packages/frontend/@n8n/design-system/src/components/AskAssistantChat/messages/helpers.ts

@@ -0,0 +1,30 @@
+import type { ChatUI } from '@n8n/design-system/types';
+
+import BlockMessage from './BlockMessage.vue';
+import CodeDiffMessage from './CodeDiffMessage.vue';
+import ErrorMessage from './ErrorMessage.vue';
+import EventMessage from './EventMessage.vue';
+import TextMessage from './TextMessage.vue';
+import ToolMessage from './ToolMessage.vue';
+
+export function getSupportedMessageComponent(type: ChatUI.AssistantMessage['type']) {
+	switch (type) {
+		case 'text':
+			return TextMessage;
+		case 'block':
+			return BlockMessage;
+		case 'code-diff':
+			return CodeDiffMessage;
+		case 'error':
+			return ErrorMessage;
+		case 'event':
+			return EventMessage;
+		case 'tool':
+			return ToolMessage;
+		case 'agent-suggestion':
+		case 'workflow-updated':
+			return null;
+		default:
+			return null;
+	}
+}