diff --git a/workspace-server/src/__tests__/services/SheetsService.test.ts b/workspace-server/src/__tests__/services/SheetsService.test.ts
index 50c1ff4..b3c4f8d 100644
--- a/workspace-server/src/__tests__/services/SheetsService.test.ts
+++ b/workspace-server/src/__tests__/services/SheetsService.test.ts
@@ -40,6 +40,7 @@ describe('SheetsService', () => {
         get: jest.fn(),
         values: {
           get: jest.fn(),
+          append: jest.fn(),
         },
       },
     };
@@ -370,4 +371,71 @@ describe('SheetsService', () => {
       expect(response.error).toBe('Metadata Error');
     });
   });
+
+  describe('appendRows', () => {
+    it('should append rows and return update info', async () => {
+      const mockResponse = {
+        data: {
+          updates: {
+            updatedRange: 'Sheet1!A3:B3',
+            updatedRows: 1,
+            updatedColumns: 2,
+            updatedCells: 2,
+          },
+        },
+      };
+
+      mockSheetsAPI.spreadsheets.values.append.mockResolvedValue(mockResponse);
+
+      const result = await sheetsService.appendRows({
+        spreadsheetId: 'test-id',
+        range: 'Sheet1!A1',
+        values: [['foo', 'bar']],
+      });
+      const response = JSON.parse(result.content[0].text);
+
+      expect(mockSheetsAPI.spreadsheets.values.append).toHaveBeenCalledWith({
+        spreadsheetId: 'test-id',
+        range: 'Sheet1!A1',
+        valueInputOption: 'USER_ENTERED',
+        requestBody: { values: [['foo', 'bar']] },
+      });
+
+      expect(response.updatedRange).toBe('Sheet1!A3:B3');
+      expect(response.updatedRows).toBe(1);
+      expect(response.updatedColumns).toBe(2);
+      expect(response.updatedCells).toBe(2);
+    });
+
+    it('should extract spreadsheet ID from URL', async () => {
+      mockSheetsAPI.spreadsheets.values.append.mockResolvedValue({
+        data: { updates: { updatedRange: 'Sheet1!A2:A2', updatedRows: 1, updatedColumns: 1, updatedCells: 1 } },
+      });
+
+      await sheetsService.appendRows({
+        spreadsheetId: 'https://docs.google.com/spreadsheets/d/abc123/edit',
+        range: 'Sheet1!A1',
+        values: [['value']],
+      });
+
+      expect(mockSheetsAPI.spreadsheets.values.append).toHaveBeenCalledWith(
+        expect.objectContaining({ spreadsheetId: 'abc123' }),
+      );
+    });
+
+    it('should handle errors gracefully', async () => {
+      mockSheetsAPI.spreadsheets.values.append.mockRejectedValue(
+        new Error('Append Error'),
+      );
+
+      const result = await sheetsService.appendRows({
+        spreadsheetId: 'error-id',
+        range: 'Sheet1!A1',
+        values: [['data']],
+      });
+      const response = JSON.parse(result.content[0].text);
+
+      expect(response.error).toBe('Append Error');
+    });
+  });
 });
diff --git a/workspace-server/src/features/feature-config.ts b/workspace-server/src/features/feature-config.ts
index e3a2cb1..56afe30 100644
--- a/workspace-server/src/features/feature-config.ts
+++ b/workspace-server/src/features/feature-config.ts
@@ -226,7 +226,7 @@ export const FEATURE_GROUPS: readonly FeatureGroup[] = [
     service: 'sheets',
     group: 'write',
     scopes: scopes('spreadsheets'),
-    tools: [],
+    tools: ['sheets.appendRows'],
     defaultEnabled: false,
   },
 
diff --git a/workspace-server/src/index.ts b/workspace-server/src/index.ts
index 59a01ce..302048d 100644
--- a/workspace-server/src/index.ts
+++ b/workspace-server/src/index.ts
@@ -505,6 +505,28 @@ async function main() {
     sheetsService.getMetadata,
   );
 
+  registerTool(
+    'sheets.appendRows',
+    {
+      description:
+        'Appends rows to a Google Sheets spreadsheet after the last row with data in the given range.',
+      inputSchema: {
+        spreadsheetId: z.string().describe('The ID or URL of the spreadsheet.'),
+        range: z
+          .string()
+          .describe(
+            'The A1 notation range to append to (e.g., "Sheet1!A1"). Data is appended after the last row with data in this range.',
+          ),
+        values: z
+          .array(z.array(z.union([z.string(), z.number(), z.boolean(), z.null()])))
+          .describe(
+            'A 2D array of values to append. Each inner array is a row (e.g., [["col1", "col2"], ["val1", "val2"]]).',
+          ),
+      },
+    },
+    sheetsService.appendRows,
+  );
+
   registerTool(
     'drive.search',
     {
diff --git a/workspace-server/src/services/SheetsService.ts b/workspace-server/src/services/SheetsService.ts
index 636f03c..739d271 100644
--- a/workspace-server/src/services/SheetsService.ts
+++ b/workspace-server/src/services/SheetsService.ts
@@ -194,6 +194,62 @@ export class SheetsService {
     }
   };
 
+  public appendRows = async ({
+    spreadsheetId,
+    range,
+    values,
+  }: {
+    spreadsheetId: string;
+    range: string;
+    values: (string | number | boolean | null)[][];
+  }) => {
+    logToFile(
+      `[SheetsService] Starting appendRows for spreadsheet: ${spreadsheetId}, range: ${range}`,
+    );
+    try {
+      const id = extractDocId(spreadsheetId) || spreadsheetId;
+
+      const sheets = await this.getSheetsClient();
+      const response = await sheets.spreadsheets.values.append({
+        spreadsheetId: id,
+        range: range,
+        valueInputOption: 'USER_ENTERED',
+        requestBody: {
+          values: values,
+        },
+      });
+
+      logToFile(`[SheetsService] Finished appendRows for spreadsheet: ${id}`);
+      return {
+        content: [
+          {
+            type: 'text' as const,
+            text: JSON.stringify({
+              updatedRange: response.data.updates?.updatedRange,
+              updatedRows: response.data.updates?.updatedRows,
+              updatedColumns: response.data.updates?.updatedColumns,
+              updatedCells: response.data.updates?.updatedCells,
+            }),
+          },
+        ],
+      };
+    } catch (error) {
+      const errorMessage =
+        error instanceof Error ? error.message : String(error);
+      logToFile(
+        `[SheetsService] Error during sheets.appendRows: ${errorMessage}`,
+      );
+      return {
+        content: [
+          {
+            type: 'text' as const,
+            text: JSON.stringify({ error: errorMessage }),
+          },
+        ],
+      };
+    }
+  };
+
   public getMetadata = async ({ spreadsheetId }: { spreadsheetId: string }) => {
     logToFile(
       `[SheetsService] Starting getMetadata for spreadsheet: ${spreadsheetId}`,