feat: implement show-task MCP command

- Create direct function wrapper in show-task.js with error handling and caching

- Add MCP tool integration for displaying detailed task information

- Update task-master-core.js to expose showTaskDirect function

- Update changeset to document the new command

- Follow kebab-case/camelCase/snake_case naming conventions

mcp-server/src/core/direct-functions/show-task.js

@@ -0,0 +1,125 @@
+/**
+ * show-task.js
+ * Direct function implementation for showing task details
+ */
+
+import { findTaskById } from '../../../../scripts/modules/utils.js';
+import { readJSON } from '../../../../scripts/modules/utils.js';
+import { getCachedOrExecute } from '../../tools/utils.js';
+import { findTasksJsonPath } from '../utils/path-utils.js';
+
+/**
+ * Direct function wrapper for showing task details with error handling and caching.
+ *
+ * @param {Object} args - Command arguments
+ * @param {Object} log - Logger object
+ * @returns {Promise<Object>} - Task details result { success: boolean, data?: any, error?: { code: string, message: string }, fromCache: boolean }
+ */
+export async function showTaskDirect(args, log) {
+  let tasksPath;
+  try {
+    // Find the tasks path first - needed for cache key and execution
+    tasksPath = findTasksJsonPath(args, log);
+  } catch (error) {
+    log.error(`Tasks file not found: ${error.message}`);
+    return { 
+      success: false, 
+      error: { 
+        code: 'FILE_NOT_FOUND_ERROR', 
+        message: error.message 
+      }, 
+      fromCache: false 
+    };
+  }
+
+  // Validate task ID
+  const taskId = args.id;
+  if (!taskId) {
+    log.error('Task ID is required');
+    return { 
+      success: false, 
+      error: { 
+        code: 'INPUT_VALIDATION_ERROR', 
+        message: 'Task ID is required' 
+      }, 
+      fromCache: false 
+    };
+  }
+
+  // Generate cache key using task path and ID
+  const cacheKey = `showTask:${tasksPath}:${taskId}`;
+  
+  // Define the action function to be executed on cache miss
+  const coreShowTaskAction = async () => {
+    try {
+      log.info(`Retrieving task details for ID: ${taskId} from ${tasksPath}`);
+      
+      // Read tasks data
+      const data = readJSON(tasksPath);
+      if (!data || !data.tasks) {
+        return { 
+          success: false, 
+          error: { 
+            code: 'INVALID_TASKS_FILE', 
+            message: `No valid tasks found in ${tasksPath}` 
+          } 
+        };
+      }
+      
+      // Find the specific task
+      const task = findTaskById(data.tasks, taskId);
+      
+      if (!task) {
+        return { 
+          success: false, 
+          error: { 
+            code: 'TASK_NOT_FOUND', 
+            message: `Task with ID ${taskId} not found` 
+          } 
+        };
+      }
+      
+      // Return the task data with the full tasks array for reference
+      // (needed for formatDependenciesWithStatus function in UI)
+      log.info(`Successfully found task ${taskId}`);
+      return { 
+        success: true, 
+        data: { 
+          task, 
+          allTasks: data.tasks 
+        } 
+      };
+    } catch (error) {
+      log.error(`Error showing task: ${error.message}`);
+      return { 
+        success: false, 
+        error: { 
+          code: 'CORE_FUNCTION_ERROR', 
+          message: error.message || 'Failed to show task details' 
+        } 
+      };
+    }
+  };
+
+  // Use the caching utility
+  try {
+    const result = await getCachedOrExecute({
+      cacheKey,
+      actionFn: coreShowTaskAction,
+      log
+    });
+    log.info(`showTaskDirect completed. From cache: ${result.fromCache}`);
+    return result; // Returns { success, data/error, fromCache }
+  } catch (error) {
+    // Catch unexpected errors from getCachedOrExecute itself
+    log.error(`Unexpected error during getCachedOrExecute for showTask: ${error.message}`);
+    return { 
+      success: false, 
+      error: { 
+        code: 'UNEXPECTED_ERROR', 
+        message: error.message 
+      }, 
+      fromCache: false 
+    };
+  }
+} 

mcp-server/src/core/task-master-core.js

@@ -13,6 +13,7 @@ import { updateTaskByIdDirect } from './direct-functions/update-task-by-id.js';
 import { updateSubtaskByIdDirect } from './direct-functions/update-subtask-by-id.js';
 import { generateTaskFilesDirect } from './direct-functions/generate-task-files.js';
 import { setTaskStatusDirect } from './direct-functions/set-task-status.js';
+import { showTaskDirect } from './direct-functions/show-task.js';
 
 // Re-export utility functions
 export { findTasksJsonPath } from './utils/path-utils.js';
@@ -27,6 +28,7 @@ export {
   updateSubtaskByIdDirect,
   generateTaskFilesDirect,
   setTaskStatusDirect,
+  showTaskDirect,
 };
 
 /**
@@ -42,5 +44,6 @@ export const directFunctions = {
   updateSubtask: updateSubtaskByIdDirect,
   generate: generateTaskFilesDirect,
   setStatus: setTaskStatusDirect,
+  showTask: showTaskDirect,
   // Add more functions as we implement them
 };