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
 }; 

mcp-server/src/tools/index.js

@@ -11,6 +11,7 @@ import { registerUpdateTool } from "./update.js";
 import { registerUpdateTaskTool } from "./update-task.js";
 import { registerUpdateSubtaskTool } from "./update-subtask.js";
 import { registerGenerateTool } from "./generate.js";
+import { registerShowTaskTool } from "./show-task.js";
 
 /**
  * Register all Task Master tools with the MCP server
@@ -24,8 +25,9 @@ export function registerTaskMasterTools(server) {
   registerUpdateTaskTool(server);
   registerUpdateSubtaskTool(server);
   registerGenerateTool(server);
+  registerShowTaskTool(server);
 }
 
 export default {
   registerTaskMasterTools,
-};
+};

mcp-server/src/tools/show-task.js

@@ -0,0 +1,53 @@
+/**
+ * tools/show-task.js
+ * Tool to show task details by ID
+ */
+
+import { z } from "zod";
+import {
+  handleApiResult,
+  createErrorResponse
+} from "./utils.js";
+import { showTaskDirect } from "../core/task-master-core.js";
+
+/**
+ * Register the show-task tool with the MCP server
+ * @param {Object} server - FastMCP server instance
+ */
+export function registerShowTaskTool(server) {
+  server.addTool({
+    name: "show_task",
+    description: "Display detailed information about a specific task",
+    parameters: z.object({
+      id: z.string().describe("Task ID to show"),
+      file: z.string().optional().describe("Path to the tasks file"),
+      projectRoot: z
+        .string()
+        .optional()
+        .describe(
+          "Root directory of the project (default: current working directory)"
+        ),
+    }),
+    execute: async (args, { log }) => {
+      try {
+        log.info(`Showing task details for ID: ${args.id}`);
+        
+        // Call the direct function wrapper
+        const result = await showTaskDirect(args, log);
+        
+        // Log result
+        if (result.success) {
+          log.info(`Successfully retrieved task details for ID: ${args.id}${result.fromCache ? ' (from cache)' : ''}`);
+        } else {
+          log.error(`Failed to show task: ${result.error.message}`);
+        }
+        
+        // Use handleApiResult to format the response
+        return handleApiResult(result, log, 'Error retrieving task details');
+      } catch (error) {
+        log.error(`Error in show-task tool: ${error.message}`);
+        return createErrorResponse(`Failed to show task: ${error.message}`);
+      }
+    },
+  });
+}