diff --git a/src/server/services/toolExecution/serverRuntimes/__tests__/topicReference.test.ts b/src/server/services/toolExecution/serverRuntimes/__tests__/topicReference.test.ts
new file mode 100644
index 0000000000..dc464140a0
--- /dev/null
+++ b/src/server/services/toolExecution/serverRuntimes/__tests__/topicReference.test.ts
@@ -0,0 +1,301 @@
+import { TopicReferenceIdentifier } from '@lobechat/builtin-tool-topic-reference';
+import { beforeEach, describe, expect, it, vi } from 'vitest';
+
+import { type ToolExecutionContext } from '../../types';
+
+// Mock database models
+const mockTopicModelFindById = vi.fn();
+const mockMessageModelQuery = vi.fn();
+
+vi.mock('@/database/models/topic', () => ({
+  TopicModel: vi.fn().mockImplementation(() => ({
+    findById: (...args: any[]) => mockTopicModelFindById(...args),
+  })),
+}));
+
+vi.mock('@/database/models/message', () => ({
+  MessageModel: vi.fn().mockImplementation(() => ({
+    query: (...args: any[]) => mockMessageModelQuery(...args),
+  })),
+}));
+
+// Import after mock setup
+const { topicReferenceRuntime } = await import('../topicReference');
+
+describe('topicReferenceRuntime', () => {
+  it('should have the correct identifier', () => {
+    expect(topicReferenceRuntime.identifier).toBe(TopicReferenceIdentifier);
+    expect(topicReferenceRuntime.identifier).toBe('lobe-topic-reference');
+  });
+
+  describe('factory', () => {
+    it('should throw when serverDB is missing', () => {
+      const context: ToolExecutionContext = {
+        toolManifestMap: {},
+        userId: 'user-1',
+      };
+
+      expect(() => topicReferenceRuntime.factory(context)).toThrow(
+        'serverDB is required for TopicReference execution',
+      );
+    });
+
+    it('should throw when userId is missing', () => {
+      const context: ToolExecutionContext = {
+        serverDB: {} as any,
+        toolManifestMap: {},
+      };
+
+      expect(() => topicReferenceRuntime.factory(context)).toThrow(
+        'userId is required for TopicReference execution',
+      );
+    });
+
+    it('should create a runtime with getTopicContext method', () => {
+      const context: ToolExecutionContext = {
+        serverDB: {} as any,
+        toolManifestMap: {},
+        userId: 'user-1',
+      };
+
+      const runtime = topicReferenceRuntime.factory(context);
+      expect(runtime).toBeDefined();
+      expect(typeof runtime.getTopicContext).toBe('function');
+    });
+  });
+
+  describe('getTopicContext', () => {
+    let runtime: any;
+
+    beforeEach(() => {
+      vi.clearAllMocks();
+
+      const context: ToolExecutionContext = {
+        serverDB: {} as any,
+        toolManifestMap: {},
+        userId: 'user-1',
+      };
+
+      runtime = topicReferenceRuntime.factory(context);
+    });
+
+    it('should return error when topicId is missing', async () => {
+      const result = await runtime.getTopicContext({ topicId: '' });
+
+      expect(result).toEqual({ content: 'topicId is required', success: false });
+    });
+
+    it('should return error when topicId is undefined', async () => {
+      const result = await runtime.getTopicContext({ topicId: undefined });
+
+      expect(result).toEqual({ content: 'topicId is required', success: false });
+    });
+
+    it('should return error when topic is not found', async () => {
+      mockTopicModelFindById.mockResolvedValue(null);
+
+      const result = await runtime.getTopicContext({ topicId: 'topic-123' });
+
+      expect(result).toEqual({
+        content: 'Topic not found: topic-123',
+        success: false,
+      });
+      expect(mockTopicModelFindById).toHaveBeenCalledWith('topic-123');
+    });
+
+    it('should return historySummary when topic has one', async () => {
+      mockTopicModelFindById.mockResolvedValue({
+        historySummary: 'This is a summary of the conversation.',
+        id: 'topic-123',
+        title: 'My Topic',
+      });
+
+      const result = await runtime.getTopicContext({ topicId: 'topic-123' });
+
+      expect(result).toEqual({
+        content: '# Topic: My Topic\n\n## Summary\nThis is a summary of the conversation.',
+        success: true,
+      });
+      // Should NOT fetch messages when summary exists
+      expect(mockMessageModelQuery).not.toHaveBeenCalled();
+    });
+
+    it('should use "Untitled" when topic has no title and has historySummary', async () => {
+      mockTopicModelFindById.mockResolvedValue({
+        historySummary: 'Summary content',
+        id: 'topic-123',
+        title: null,
+      });
+
+      const result = await runtime.getTopicContext({ topicId: 'topic-123' });
+
+      expect(result.content).toContain('# Topic: Untitled');
+      expect(result.success).toBe(true);
+    });
+
+    it('should fallback to messages when topic has no historySummary', async () => {
+      mockTopicModelFindById.mockResolvedValue({
+        agentId: 'agent-1',
+        groupId: 'group-1',
+        id: 'topic-123',
+        title: 'Chat Topic',
+      });
+
+      mockMessageModelQuery.mockResolvedValue([
+        { content: 'Hello', role: 'user' },
+        { content: 'Hi there!', role: 'assistant' },
+      ]);
+
+      const result = await runtime.getTopicContext({ topicId: 'topic-123' });
+
+      expect(result.success).toBe(true);
+      expect(result.content).toContain('# Topic: Chat Topic');
+      expect(result.content).toContain('## Recent Messages');
+      expect(result.content).toContain('**User**: Hello');
+      expect(result.content).toContain('**Assistant**: Hi there!');
+
+      expect(mockMessageModelQuery).toHaveBeenCalledWith({
+        agentId: 'agent-1',
+        groupId: 'group-1',
+        topicId: 'topic-123',
+      });
+    });
+
+    it('should pass undefined agentId/groupId when topic has none', async () => {
+      mockTopicModelFindById.mockResolvedValue({
+        id: 'topic-123',
+        title: 'Simple Topic',
+      });
+
+      mockMessageModelQuery.mockResolvedValue([]);
+
+      await runtime.getTopicContext({ topicId: 'topic-123' });
+
+      expect(mockMessageModelQuery).toHaveBeenCalledWith({
+        agentId: undefined,
+        groupId: undefined,
+        topicId: 'topic-123',
+      });
+    });
+
+    it('should limit messages to last 30', async () => {
+      mockTopicModelFindById.mockResolvedValue({
+        id: 'topic-123',
+        title: 'Long Chat',
+      });
+
+      // Create 35 messages with unique identifiable content
+      const messages = Array.from({ length: 35 }, (_, i) => ({
+        content: `UniqueMsg-${String(i + 1).padStart(3, '0')}`,
+        role: 'user',
+      }));
+      mockMessageModelQuery.mockResolvedValue(messages);
+
+      const result = await runtime.getTopicContext({ topicId: 'topic-123' });
+
+      expect(result.success).toBe(true);
+      // Should only contain last 30 messages (indices 5-34, i.e. UniqueMsg-006 to UniqueMsg-035)
+      expect(result.content).not.toContain('UniqueMsg-001');
+      expect(result.content).not.toContain('UniqueMsg-005');
+      expect(result.content).toContain('UniqueMsg-006');
+      expect(result.content).toContain('UniqueMsg-035');
+    });
+
+    it('should skip messages with empty content', async () => {
+      mockTopicModelFindById.mockResolvedValue({
+        id: 'topic-123',
+        title: 'Topic',
+      });
+
+      mockMessageModelQuery.mockResolvedValue([
+        { content: 'Valid message', role: 'user' },
+        { content: '', role: 'assistant' },
+        { content: '   ', role: 'user' },
+        { content: 'Another message', role: 'assistant' },
+      ]);
+
+      const result = await runtime.getTopicContext({ topicId: 'topic-123' });
+
+      expect(result.content).toContain('**User**: Valid message');
+      expect(result.content).toContain('**Assistant**: Another message');
+      // Empty/whitespace messages should not appear
+      const lines = result.content.split('\n').filter((l: string) => l.trim());
+      const messageLines = lines.filter((l: string) => l.startsWith('**'));
+      expect(messageLines).toHaveLength(2);
+    });
+
+    it('should handle non-user and non-assistant roles', async () => {
+      mockTopicModelFindById.mockResolvedValue({
+        id: 'topic-123',
+        title: 'Topic',
+      });
+
+      mockMessageModelQuery.mockResolvedValue([
+        { content: 'System message', role: 'system' },
+        { content: 'Tool result', role: 'tool' },
+      ]);
+
+      const result = await runtime.getTopicContext({ topicId: 'topic-123' });
+
+      expect(result.success).toBe(true);
+      expect(result.content).toContain('**system**: System message');
+      expect(result.content).toContain('**tool**: Tool result');
+    });
+
+    it('should return error when topic model throws', async () => {
+      const error = new Error('Database connection failed');
+      mockTopicModelFindById.mockRejectedValue(error);
+
+      const result = await runtime.getTopicContext({ topicId: 'topic-123' });
+
+      expect(result.success).toBe(false);
+      expect(result.content).toContain('Failed to fetch topic context: Database connection failed');
+      expect(result.error).toBe(error);
+    });
+
+    it('should return error when message model throws', async () => {
+      mockTopicModelFindById.mockResolvedValue({
+        id: 'topic-123',
+        title: 'Topic',
+      });
+
+      const error = new Error('Query failed');
+      mockMessageModelQuery.mockRejectedValue(error);
+
+      const result = await runtime.getTopicContext({ topicId: 'topic-123' });
+
+      expect(result.success).toBe(false);
+      expect(result.content).toContain('Failed to fetch topic context: Query failed');
+      expect(result.error).toBe(error);
+    });
+
+    it('should handle non-Error exceptions', async () => {
+      mockTopicModelFindById.mockRejectedValue('string error');
+
+      const result = await runtime.getTopicContext({ topicId: 'topic-123' });
+
+      expect(result.success).toBe(false);
+      expect(result.content).toContain('Failed to fetch topic context: string error');
+    });
+
+    it('should handle null message content', async () => {
+      mockTopicModelFindById.mockResolvedValue({
+        id: 'topic-123',
+        title: 'Topic',
+      });
+
+      mockMessageModelQuery.mockResolvedValue([
+        { content: null, role: 'user' },
+        { content: 'Real message', role: 'assistant' },
+      ]);
+
+      const result = await runtime.getTopicContext({ topicId: 'topic-123' });
+
+      expect(result.success).toBe(true);
+      // null content should be treated as empty and skipped
+      const messageLines = result.content.split('\n').filter((l: string) => l.startsWith('**'));
+      expect(messageLines).toHaveLength(1);
+      expect(result.content).toContain('**Assistant**: Real message');
+    });
+  });
+});