fix(mcp): make projectRoot optional in all MCP tools

- Update all tool definitions to use z.string().optional() for projectRoot
- Fix direct function implementations to use findTasksJsonPath(args, log) pattern
- Enables consistent project root detection without requiring explicit params
- Update changeset to document these improvements

This change ensures MCP tools work properly with the smart project root
detection system, removing the need for explicit projectRoot parameters in
client applications. Improves usability and reduces integration friction.

mcp-server/src/core/direct-functions/add-subtask.js

@@ -47,7 +47,7 @@ export async function addSubtaskDirect(args, log) {
     }
 
     // Find the tasks.json path
-    const tasksPath = findTasksJsonPath(args.file, args.projectRoot);
+    const tasksPath = findTasksJsonPath(args, log);
     
     // Parse dependencies if provided
     let dependencies = [];

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

@@ -20,8 +20,8 @@ import { findTasksJsonPath } from '../utils/path-utils.js';
  */
 export async function addTaskDirect(args, log) {
   try {
-    // Resolve the tasks file path
-    const tasksPath = findTasksJsonPath(args.file, args.projectRoot);
+    // Find the tasks.json path
+    const tasksPath = findTasksJsonPath(args, log);
     
     // Check required parameters
     if (!args.prompt) {

mcp-server/src/core/direct-functions/analyze-task-complexity.js

@@ -24,7 +24,7 @@ export async function analyzeTaskComplexityDirect(args, log) {
     log.info(`Analyzing task complexity with args: ${JSON.stringify(args)}`);
     
     // Find the tasks.json path
-    const tasksPath = findTasksJsonPath(args.file, args.projectRoot);
+    const tasksPath = findTasksJsonPath(args, log);
     
     // Determine output path
     let outputPath = args.output || 'scripts/task-complexity-report.json';

mcp-server/src/core/direct-functions/clear-subtasks.js

@@ -32,7 +32,7 @@ export async function clearSubtasksDirect(args, log) {
     }
 
     // Find the tasks.json path
-    const tasksPath = findTasksJsonPath(args.file, args.projectRoot);
+    const tasksPath = findTasksJsonPath(args, log);
     
     // Check if tasks.json exists
     if (!fs.existsSync(tasksPath)) {

mcp-server/src/core/direct-functions/expand-all-tasks.js

@@ -22,7 +22,7 @@ export async function expandAllTasksDirect(args, log) {
     log.info(`Expanding all tasks with args: ${JSON.stringify(args)}`);
     
     // Find the tasks.json path
-    const tasksPath = findTasksJsonPath(args.file, args.projectRoot);
+    const tasksPath = findTasksJsonPath(args, log);
     
     // Parse parameters
     const numSubtasks = args.num ? parseInt(args.num, 10) : undefined;

mcp-server/src/core/direct-functions/fix-dependencies.js

@@ -18,8 +18,8 @@ export async function fixDependenciesDirect(args, log) {
   try {
     log.info(`Fixing invalid dependencies in tasks...`);
     
-    // Determine the tasks file path
-    const tasksPath = args.file || await findTasksJsonPath(args.projectRoot);
+    // Find the tasks.json path
+    const tasksPath = findTasksJsonPath(args, log);
     
     // Verify the file exists
     if (!fs.existsSync(tasksPath)) {

mcp-server/src/core/direct-functions/remove-dependency.js

@@ -41,7 +41,7 @@ export async function removeDependencyDirect(args, log) {
     }
     
     // Find the tasks.json path
-    const tasksPath = findTasksJsonPath(args.file, args.projectRoot);
+    const tasksPath = findTasksJsonPath(args, log);
     
     // Format IDs for the core function
     const taskId = args.id.includes && args.id.includes('.') ? args.id : parseInt(args.id, 10);

mcp-server/src/core/direct-functions/remove-subtask.js

@@ -42,7 +42,7 @@ export async function removeSubtaskDirect(args, log) {
     }
 
     // Find the tasks.json path
-    const tasksPath = findTasksJsonPath(args.file, args.projectRoot);
+    const tasksPath = findTasksJsonPath(args, log);
     
     // Convert convertToTask to a boolean
     const convertToTask = args.convert === true;

mcp-server/src/core/direct-functions/validate-dependencies.js

@@ -18,8 +18,8 @@ export async function validateDependenciesDirect(args, log) {
   try {
     log.info(`Validating dependencies in tasks...`);
     
-    // Determine the tasks file path
-    const tasksPath = args.file || await findTasksJsonPath(args.projectRoot);
+    // Find the tasks.json path
+    const tasksPath = findTasksJsonPath(args, log);
     
     // Verify the file exists
     if (!fs.existsSync(tasksPath)) {