feat: expand MCP tool surface to 12 tools

Add tl_structure, tl_audit, tl_deps, tl_exports.

tl_structure: project overview with token estimates; replaces ls -R patterns
tl_audit: mid-session token waste analysis with savings breakdown
tl_deps: file dependency tree without reading implementation
tl_exports: public API surface of a module or directory

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

Author: carlkibler

src/mcp-tools.mjs

@@ -183,6 +183,62 @@ export const TOOLS = [
       return dispatchTool('diff', args);
     },
   },
+  {
+    name: 'tl_structure',
+    description: 'Project overview: directory tree with file counts and token estimates. Use this first when exploring an unfamiliar codebase instead of running ls -R or find.',
+    schema: {
+      path: z.string().optional().describe('Root path (default: cwd)'),
+      depth: z.number().optional().describe('Max directory depth (default: 3)'),
+    },
+    handler: async ({ path, depth }) => {
+      const args = [];
+      if (path) args.push(path);
+      if (depth) args.push('-d', String(depth));
+      args.push('-j');
+      return dispatchTool('structure', args);
+    },
+  },
+  {
+    name: 'tl_audit',
+    description: 'Analyze token waste in this session or project. Shows what patterns are costing tokens and how many were already saved by tokenlean.',
+    schema: {
+      path: z.string().optional().describe('Project directory or session file to analyze (default: cwd)'),
+      savings: z.boolean().optional().describe('Include tokens saved by tokenlean (default: false)'),
+      all: z.boolean().optional().describe('Analyze all sessions, not just the most recent'),
+    },
+    handler: async ({ path, savings, all }) => {
+      const args = [];
+      if (path) args.push(path);
+      if (savings) args.push('--savings');
+      if (all) args.push('--all');
+      args.push('-j');
+      return dispatchTool('audit', args);
+    },
+  },
+  {
+    name: 'tl_deps',
+    description: 'Show imports and dependency tree for a file. Reveals what a file depends on without reading it.',
+    schema: {
+      file: z.string().describe('File to show dependencies for'),
+      depth: z.number().optional().describe('Dependency depth to traverse (default: 1)'),
+    },
+    handler: async ({ file, depth }) => {
+      const args = [file];
+      if (depth) args.push('-d', String(depth));
+      args.push('-j');
+      return dispatchTool('deps', args);
+    },
+  },
+  {
+    name: 'tl_exports',
+    description: 'Show public API surface of a module or directory — what it exports without reading implementations.',
+    schema: {
+      path: z.string().describe('File or directory to analyze'),
+    },
+    handler: async ({ path }) => {
+      return dispatchTool('exports', [path, '-j']);
+    },
+  },
 ];
 
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