Task 104: Implement 'scope-up' and 'scope-down' CLI Commands for Dynamic Task Complexity Adjustment (#1069)

* feat(task-104): Complete task 104 - Implement scope-up and scope-down CLI Commands

- Added new CLI commands 'scope-up' and 'scope-down' with comma-separated ID support
- Implemented strength levels (light/regular/heavy) and custom prompt functionality
- Created core complexity adjustment logic with AI integration
- Added MCP tool equivalents for integrated environments
- Comprehensive error handling and task validation
- Full test coverage with TDD approach
- Updated task manager core and UI components

Task 104: Implement 'scope-up' and 'scope-down' CLI Commands for Dynamic Task Complexity Adjustment - Complete implementation with CLI, MCP integration, and testing

* chore: Add changeset for scope-up and scope-down features

- Comprehensive user-facing description with usage examples
- Key features and benefits explanation
- CLI and MCP integration details
- Real-world use cases for agile workflows

* feat(extension): Add scope-up and scope-down to VS Code extension task details

- Added useScopeUpTask and useScopeDownTask hooks in useTaskQueries.ts
- Enhanced AIActionsSection with Task Complexity Adjustment section
- Added strength selection (light/regular/heavy) and custom prompt support
- Integrated scope buttons with proper loading states and error handling
- Uses existing mcpRequest handler for scope_up_task and scope_down_task tools
- Maintains consistent UI patterns with existing AI actions

Extension now supports dynamic task complexity adjustment directly from task details view.

mcp-server/src/tools/scope-down.js

@@ -0,0 +1,104 @@
+/**
+ * tools/scope-down.js
+ * Tool to scope down task complexity
+ */
+
+import { z } from 'zod';
+import {
+	createErrorResponse,
+	handleApiResult,
+	withNormalizedProjectRoot
+} from './utils.js';
+import { scopeDownDirect } from '../core/task-master-core.js';
+import { findTasksPath } from '../core/utils/path-utils.js';
+import { resolveTag } from '../../../scripts/modules/utils.js';
+
+/**
+ * Register the scopeDown tool with the MCP server
+ * @param {Object} server - FastMCP server instance
+ */
+export function registerScopeDownTool(server) {
+	server.addTool({
+		name: 'scope_down_task',
+		description: 'Decrease the complexity of one or more tasks using AI',
+		parameters: z.object({
+			id: z
+				.string()
+				.describe(
+					'Comma-separated list of task IDs to scope down (e.g., "1,3,5")'
+				),
+			strength: z
+				.string()
+				.optional()
+				.describe(
+					'Strength level: light, regular, or heavy (default: regular)'
+				),
+			prompt: z
+				.string()
+				.optional()
+				.describe('Custom prompt for specific scoping adjustments'),
+			file: z
+				.string()
+				.optional()
+				.describe('Path to the tasks file (default: tasks/tasks.json)'),
+			projectRoot: z
+				.string()
+				.describe('The directory of the project. Must be an absolute path.'),
+			tag: z.string().optional().describe('Tag context to operate on'),
+			research: z
+				.boolean()
+				.optional()
+				.describe('Whether to use research capabilities for scoping')
+		}),
+		execute: withNormalizedProjectRoot(async (args, { log, session }) => {
+			try {
+				log.info(`Starting scope-down with args: ${JSON.stringify(args)}`);
+
+				const resolvedTag = resolveTag({
+					projectRoot: args.projectRoot,
+					tag: args.tag
+				});
+
+				// Use args.projectRoot directly (guaranteed by withNormalizedProjectRoot)
+				let tasksJsonPath;
+				try {
+					tasksJsonPath = findTasksPath(
+						{ projectRoot: args.projectRoot, file: args.file },
+						log
+					);
+				} catch (error) {
+					log.error(`Error finding tasks.json: ${error.message}`);
+					return createErrorResponse(
+						`Failed to find tasks.json: ${error.message}`
+					);
+				}
+
+				// Call the direct function
+				const result = await scopeDownDirect(
+					{
+						tasksJsonPath: tasksJsonPath,
+						id: args.id,
+						strength: args.strength,
+						prompt: args.prompt,
+						research: args.research,
+						projectRoot: args.projectRoot,
+						tag: resolvedTag
+					},
+					log,
+					{ session }
+				);
+
+				return handleApiResult(
+					result,
+					log,
+					'Error scoping down task',
+					undefined,
+					args.projectRoot
+				);
+			} catch (error) {
+				log.error(`Error in scope-down tool: ${error.message}`);
+				return createErrorResponse(error.message);
+			}
+		})
+	});
+}