feat: Add epic_close MCP tool

- New epic_close(id) function to mark epics as completed
- Added tool definition and handler
- Usage: epic_close({ id: 'CF-E1' })

Task: CF-258

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

src/index.ts

@@ -21,7 +21,7 @@ import { toolDefinitions } from './tools/index.js';
 import { taskAdd, taskList, taskShow, taskClose, taskUpdate } from './tools/crud.js';
 import { taskSimilar, taskContext } from './tools/search.js';
 import { taskLink, checklistAdd, checklistToggle, taskResolveDuplicate } from './tools/relations.js';
-import { epicAdd, epicList, epicShow, epicAssign } from './tools/epics.js';
+import { epicAdd, epicList, epicShow, epicAssign, epicClose } from './tools/epics.js';
 import { taskDelegations, taskDelegationQuery } from './tools/delegations.js';
 
 // Create MCP server
@@ -147,6 +147,9 @@ server.setRequestHandler(CallToolRequestSchema, async (request) => {
           epic_id: a.epic_id,
         });
         break;
+      case 'epic_close':
+        result = await epicClose(a.id);
+        break;
 
       // Delegations
       case 'task_delegations':

src/tools/epics.ts

@@ -209,3 +209,30 @@ export async function epicUnassign(task_id: string): Promise<string> {
 
   return `Unassigned ${task_id} from its epic`;
 }
+
+/**
+ * Close an epic (mark as completed)
+ */
+export async function epicClose(id: string): Promise<string> {
+  // Verify epic exists
+  const epic = await queryOne<{ id: string; title: string; status: string }>(
+    `SELECT id, title, status FROM epics WHERE id = $1`,
+    [id]
+  );
+
+  if (!epic) {
+    return `Epic not found: ${id}`;
+  }
+
+  if (epic.status === 'completed') {
+    return `Epic already completed: ${id}`;
+  }
+
+  // Update epic status
+  await execute(
+    `UPDATE epics SET status = 'completed', updated_at = NOW() WHERE id = $1`,
+    [id]
+  );
+
+  return `Closed: ${id} (${epic.title})`;
+}

src/tools/index.ts

@@ -197,6 +197,17 @@ export const toolDefinitions = [
       required: ['task_id', 'epic_id'],
     },
   },
+  {
+    name: 'epic_close',
+    description: 'Close an epic (mark as completed)',
+    inputSchema: {
+      type: 'object',
+      properties: {
+        id: { type: 'string', description: 'Epic ID to close (e.g., VPN-E1, ST-E3)' },
+      },
+      required: ['id'],
+    },
+  },
 
   // Delegation Tools
   {