diff --git a/manifest.json b/manifest.json
index 2bb9610..54b357c 100644
--- a/manifest.json
+++ b/manifest.json
@@ -99,7 +99,7 @@
       "description": "List all tags in the vault or in a specific note. Optionally include usage counts and sort by frequency or name."
     },
     {
-      "name": "obsidian_get_tag_info",
+      "name": "obsidian_search_by_tag",
       "description": "Get detailed information about a specific tag, including which notes use it and how many times."
     },
     {
diff --git a/src/tools/links.ts b/src/tools/links.ts
index 469d014..f3b6271 100644
--- a/src/tools/links.ts
+++ b/src/tools/links.ts
@@ -22,10 +22,28 @@ export async function registerLinkTools(server: ObsidianMCPServer): Promise<void
   server.registerTool(
     'obsidian_get_backlinks',
     'Get all backlinks (incoming links) to a note. Shows which notes reference this note. Optionally include link counts.',
-    { type: 'object', properties: {} },
+    {
+      type: 'object',
+      properties: {
+        file: { type: 'string', description: 'Target file name' },
+        path: { type: 'string', description: 'Target file path' },
+        counts: { type: 'boolean', description: 'Include link counts' },
+        total: { type: 'boolean', description: 'Return backlink count' },
+        format: { type: 'string', enum: ['json', 'tsv', 'csv'], description: 'Output format (default: tsv)' },
+      },
+    },
     createToolHandler(
       'Get backlinks to a note',
-      { type: 'object', properties: {} },
+      {
+        type: 'object',
+        properties: {
+          file: { type: 'string', description: 'Target file name' },
+          path: { type: 'string', description: 'Target file path' },
+          counts: { type: 'boolean', description: 'Include link counts' },
+          total: { type: 'boolean', description: 'Return backlink count' },
+          format: { type: 'string', enum: ['json', 'tsv', 'csv'], description: 'Output format' },
+        },
+      },
       async (args) => {
         const validated = fileIdentifierSchema.parse(args) as any;
         const sanitized = sanitizeParameters(validated) as any;
@@ -34,6 +52,7 @@ export async function registerLinkTools(server: ObsidianMCPServer): Promise<void
         if (sanitized.file) cmdArgs.push(formatParam('file', sanitized.file));
         if (sanitized.path) cmdArgs.push(formatParam('path', sanitized.path));
         if ((args as any).counts) cmdArgs.push('counts');
+        if ((args as any).total) cmdArgs.push('total');
         if ((args as any).format) cmdArgs.push(formatParam('format', (args as any).format));
 
         const result = await executeObsidianCommand('backlinks', cmdArgs);
@@ -56,12 +75,26 @@ export async function registerLinkTools(server: ObsidianMCPServer): Promise<void
 
   // T051: Get outgoing links tool
   server.registerTool(
-    'obsidian_get_outgoing_links',
+    'obsidian_list_outgoing_links',
     'Get all outgoing links from a note. Shows which notes this note references. Useful for understanding note connections.',
-    { type: 'object', properties: {} },
+    {
+      type: 'object',
+      properties: {
+        file: { type: 'string', description: 'File name' },
+        path: { type: 'string', description: 'File path' },
+        total: { type: 'boolean', description: 'Return link count' },
+      },
+    },
     createToolHandler(
       'Get outgoing links from a note',
-      { type: 'object', properties: {} },
+      {
+        type: 'object',
+        properties: {
+          file: { type: 'string', description: 'File name' },
+          path: { type: 'string', description: 'File path' },
+          total: { type: 'boolean', description: 'Return link count' },
+        },
+      },
       async (args) => {
         const validated = fileIdentifierSchema.parse(args) as any;
         const sanitized = sanitizeParameters(validated) as any;
@@ -69,19 +102,18 @@ export async function registerLinkTools(server: ObsidianMCPServer): Promise<void
         const cmdArgs: string[] = [];
         if (sanitized.file) cmdArgs.push(formatParam('file', sanitized.file));
         if (sanitized.path) cmdArgs.push(formatParam('path', sanitized.path));
-        if ((args as any).format) cmdArgs.push(formatParam('format', (args as any).format));
+        if ((args as any).total) cmdArgs.push('total');
 
         const result = await executeObsidianCommand('links', cmdArgs);
         handleCLIResult(result, { operation: 'outgoing_links', identifier: sanitized.file || sanitized.path });
 
-        const format = (args as any).format || 'text';
-        const parsedData = parseOutput(result.stdout, format);
+        const parsedData = parseOutput(result.stdout, 'text');
 
         return {
           content: [
             {
               type: 'text',
-              text: formatForMCP(parsedData, format),
+              text: formatForMCP(parsedData, 'text'),
             },
           ],
         };
@@ -93,14 +125,33 @@ export async function registerLinkTools(server: ObsidianMCPServer): Promise<void
   server.registerTool(
     'obsidian_list_unresolved_links',
     'List all unresolved (broken) wikilinks in the vault. Shows links pointing to notes that don\'t exist. Useful for finding content gaps.',
-    { type: 'object', properties: {} },
+    {
+      type: 'object',
+      properties: {
+        total: { type: 'boolean', description: 'Return unresolved link count' },
+        counts: { type: 'boolean', description: 'Include link counts' },
+        verbose: { type: 'boolean', description: 'Include source files' },
+        format: { type: 'string', enum: ['json', 'tsv', 'csv'], description: 'Output format (default: tsv)' },
+      },
+    },
     createToolHandler(
       'List unresolved/broken links',
-      { type: 'object', properties: {} },
+      {
+        type: 'object',
+        properties: {
+          total: { type: 'boolean', description: 'Return unresolved link count' },
+          counts: { type: 'boolean', description: 'Include link counts' },
+          verbose: { type: 'boolean', description: 'Include source files' },
+          format: { type: 'string', enum: ['json', 'tsv', 'csv'], description: 'Output format' },
+        },
+      },
       async (args) => {
         const sanitized = sanitizeParameters(args as any) as any;
 
         const cmdArgs: string[] = [];
+        if (sanitized.total) cmdArgs.push('total');
+        if (sanitized.counts) cmdArgs.push('counts');
+        if (sanitized.verbose) cmdArgs.push('verbose');
         if (sanitized.format) cmdArgs.push(formatParam('format', sanitized.format));
 
         const result = await executeObsidianCommand('unresolved', cmdArgs);
@@ -125,27 +176,39 @@ export async function registerLinkTools(server: ObsidianMCPServer): Promise<void
   server.registerTool(
     'obsidian_list_deadends',
     'List all dead-end notes (notes with no outgoing links). These notes don\'t connect to anything else in the vault.',
-    { type: 'object', properties: {} },
+    {
+      type: 'object',
+      properties: {
+        total: { type: 'boolean', description: 'Return dead-end count' },
+        all: { type: 'boolean', description: 'Include non-markdown files' },
+      },
+    },
     createToolHandler(
       'List dead-end notes',
-      { type: 'object', properties: {} },
+      {
+        type: 'object',
+        properties: {
+          total: { type: 'boolean', description: 'Return dead-end count' },
+          all: { type: 'boolean', description: 'Include non-markdown files' },
+        },
+      },
       async (args) => {
         const sanitized = sanitizeParameters(args as any) as any;
 
         const cmdArgs: string[] = [];
-        if (sanitized.format) cmdArgs.push(formatParam('format', sanitized.format));
+        if (sanitized.total) cmdArgs.push('total');
+        if (sanitized.all) cmdArgs.push('all');
 
         const result = await executeObsidianCommand('deadends', cmdArgs);
         handleCLIResult(result, { operation: 'deadends' });
 
-        const format = sanitized.format || 'text';
-        const parsedData = parseOutput(result.stdout, format);
+        const parsedData = parseOutput(result.stdout, 'text');
 
         return {
           content: [
             {
               type: 'text',
-              text: formatForMCP(parsedData, format),
+              text: formatForMCP(parsedData, 'text'),
             },
           ],
         };
@@ -157,27 +220,39 @@ export async function registerLinkTools(server: ObsidianMCPServer): Promise<void
   server.registerTool(
     'obsidian_list_orphans',
     'List all orphan notes (notes with no incoming links/backlinks). These notes aren\'t referenced by any other notes.',
-    { type: 'object', properties: {} },
+    {
+      type: 'object',
+      properties: {
+        total: { type: 'boolean', description: 'Return orphan count' },
+        all: { type: 'boolean', description: 'Include non-markdown files' },
+      },
+    },
     createToolHandler(
       'List orphan notes',
-      { type: 'object', properties: {} },
+      {
+        type: 'object',
+        properties: {
+          total: { type: 'boolean', description: 'Return orphan count' },
+          all: { type: 'boolean', description: 'Include non-markdown files' },
+        },
+      },
       async (args) => {
         const sanitized = sanitizeParameters(args as any) as any;
 
         const cmdArgs: string[] = [];
-        if (sanitized.format) cmdArgs.push(formatParam('format', sanitized.format));
+        if (sanitized.total) cmdArgs.push('total');
+        if (sanitized.all) cmdArgs.push('all');
 
         const result = await executeObsidianCommand('orphans', cmdArgs);
         handleCLIResult(result, { operation: 'orphans' });
 
-        const format = sanitized.format || 'text';
-        const parsedData = parseOutput(result.stdout, format);
+        const parsedData = parseOutput(result.stdout, 'text');
 
         return {
           content: [
             {
               type: 'text',
-              text: formatForMCP(parsedData, format),
+              text: formatForMCP(parsedData, 'text'),
             },
           ],
         };
diff --git a/src/tools/tags-aliases.ts b/src/tools/tags-aliases.ts
index e1828a3..71189e1 100644
--- a/src/tools/tags-aliases.ts
+++ b/src/tools/tags-aliases.ts
@@ -21,10 +21,32 @@ export async function registerTagsAndAliasesTools(server: ObsidianMCPServer): Pr
   server.registerTool(
     'obsidian_list_tags',
     'List all tags in the vault or in a specific note. Optionally include usage counts and sort by frequency or name.',
-    { type: 'object', properties: {} },
+    {
+      type: 'object',
+      properties: {
+        file: { type: 'string', description: 'File name' },
+        path: { type: 'string', description: 'File path' },
+        total: { type: 'boolean', description: 'Return tag count' },
+        counts: { type: 'boolean', description: 'Include tag counts' },
+        sort: { type: 'string', enum: ['count'], description: 'Sort by count (default: name)' },
+        format: { type: 'string', enum: ['json', 'tsv', 'csv'], description: 'Output format (default: tsv)' },
+        active: { type: 'boolean', description: 'Show tags for active file' },
+      },
+    },
     createToolHandler(
       'List tags in vault or note',
-      { type: 'object', properties: {} },
+      {
+        type: 'object',
+        properties: {
+          file: { type: 'string', description: 'File name' },
+          path: { type: 'string', description: 'File path' },
+          total: { type: 'boolean', description: 'Return tag count' },
+          counts: { type: 'boolean', description: 'Include tag counts' },
+          sort: { type: 'string', enum: ['count'], description: 'Sort by count' },
+          format: { type: 'string', enum: ['json', 'tsv', 'csv'], description: 'Output format' },
+          active: { type: 'boolean', description: 'Show tags for active file' },
+        },
+      },
       async (args) => {
         const sanitized = sanitizeParameters(args as any) as any;
 
@@ -37,9 +59,11 @@ export async function registerTagsAndAliasesTools(server: ObsidianMCPServer): Pr
           cmdArgs.push(formatParam('path', sanitized.path));
         }
         
+        if (sanitized.total) cmdArgs.push('total');
         if (sanitized.counts) cmdArgs.push('counts');
-        if (sanitized.sortBy) cmdArgs.push(formatParam('sort', sanitized.sortBy));
+        if (sanitized.sort) cmdArgs.push(formatParam('sort', sanitized.sort));
         if (sanitized.format) cmdArgs.push(formatParam('format', sanitized.format));
+        if (sanitized.active) cmdArgs.push('active');
 
         const result = await executeObsidianCommand('tags', cmdArgs);
         handleCLIResult(result, { operation: 'list_tags' });
@@ -61,33 +85,49 @@ export async function registerTagsAndAliasesTools(server: ObsidianMCPServer): Pr
 
   // T055: Get tag info tool
   server.registerTool(
-    'obsidian_get_tag_info',
+    'obsidian_search_by_tag',
     'Get detailed information about a specific tag, including which notes use it and how many times.',
-    { type: 'object', properties: {} },
+    {
+      type: 'object',
+      required: ['name'],
+      properties: {
+        name: { type: 'string', description: 'Tag name (required)' },
+        total: { type: 'boolean', description: 'Return occurrence count' },
+        verbose: { type: 'boolean', description: 'Include file list and count' },
+      },
+    },
     createToolHandler(
       'Get information about a tag',
-      { type: 'object', properties: {} },
+      {
+        type: 'object',
+        required: ['name'],
+        properties: {
+          name: { type: 'string', description: 'Tag name (required)' },
+          total: { type: 'boolean', description: 'Return occurrence count' },
+          verbose: { type: 'boolean', description: 'Include file list and count' },
+        },
+      },
       async (args) => {
         const sanitized = sanitizeParameters(args as any) as any;
 
-        if (!sanitized.tag) {
-          throw new Error('Tag parameter is required');
+        if (!sanitized.name) {
+          throw new Error('Tag name parameter is required');
         }
 
-        const cmdArgs: string[] = [formatParam('name', sanitized.tag)];
-        if (sanitized.format) cmdArgs.push(formatParam('format', sanitized.format));
+        const cmdArgs: string[] = [formatParam('name', sanitized.name)];
+        if (sanitized.total) cmdArgs.push('total');
+        if (sanitized.verbose) cmdArgs.push('verbose');
 
         const result = await executeObsidianCommand('tag', cmdArgs);
-        handleCLIResult(result, { operation: 'tag_info', tag: sanitized.tag });
+        handleCLIResult(result, { operation: 'tag_info', tag: sanitized.name });
 
-        const format = sanitized.format || 'text';
-        const parsedData = parseOutput(result.stdout, format);
+        const parsedData = parseOutput(result.stdout, 'text');
 
         return {
           content: [
             {
               type: 'text',
-              text: formatForMCP(parsedData, format),
+              text: formatForMCP(parsedData, 'text'),
             },
           ],
         };
@@ -99,10 +139,28 @@ export async function registerTagsAndAliasesTools(server: ObsidianMCPServer): Pr
   server.registerTool(
     'obsidian_list_aliases',
     'List all aliases in the vault or for a specific note. Aliases are alternative names for notes.',
-    { type: 'object', properties: {} },
+    {
+      type: 'object',
+      properties: {
+        file: { type: 'string', description: 'File name' },
+        path: { type: 'string', description: 'File path' },
+        total: { type: 'boolean', description: 'Return alias count' },
+        verbose: { type: 'boolean', description: 'Include file paths' },
+        active: { type: 'boolean', description: 'Show aliases for active file' },
+      },
+    },
     createToolHandler(
       'List aliases in vault or note',
-      { type: 'object', properties: {} },
+      {
+        type: 'object',
+        properties: {
+          file: { type: 'string', description: 'File name' },
+          path: { type: 'string', description: 'File path' },
+          total: { type: 'boolean', description: 'Return alias count' },
+          verbose: { type: 'boolean', description: 'Include file paths' },
+          active: { type: 'boolean', description: 'Show aliases for active file' },
+        },
+      },
       async (args) => {
         const sanitized = sanitizeParameters(args as any) as any;
 
@@ -115,7 +173,9 @@ export async function registerTagsAndAliasesTools(server: ObsidianMCPServer): Pr
           cmdArgs.push(formatParam('path', sanitized.path));
         }
         
-        if (sanitized.format) cmdArgs.push(formatParam('format', sanitized.format));
+        if (sanitized.total) cmdArgs.push('total');
+        if (sanitized.verbose) cmdArgs.push('verbose');
+        if (sanitized.active) cmdArgs.push('active');
 
         const result = await executeObsidianCommand('aliases', cmdArgs);
         handleCLIResult(result, { operation: 'list_aliases' });
@@ -135,5 +195,49 @@ export async function registerTagsAndAliasesTools(server: ObsidianMCPServer): Pr
     )
   );
 
-  logger.info('Tags and aliases tools registered', { count: 3 });
+  // Additional tool: Get tag count (wrapper for tag with total flag)
+  server.registerTool(
+    'obsidian_get_tag_count',
+    'Count how many notes use a specific tag.',
+    {
+      type: 'object',
+      required: ['name'],
+      properties: {
+        name: { type: 'string', description: 'Tag name (required)' },
+      },
+    },
+    createToolHandler(
+      'Get tag usage count',
+      {
+        type: 'object',
+        required: ['name'],
+        properties: {
+          name: { type: 'string', description: 'Tag name (required)' },
+        },
+      },
+      async (args) => {
+        const sanitized = sanitizeParameters(args as any) as any;
+
+        if (!sanitized.name) {
+          throw new Error('Tag name parameter is required');
+        }
+
+        const cmdArgs: string[] = [formatParam('name', sanitized.name), 'total'];
+
+        const result = await executeObsidianCommand('tag', cmdArgs);
+        handleCLIResult(result, { operation: 'tag_count', tag: sanitized.name });
+
+        return {
+          content: [
+            {
+              type: 'text',
+              text: result.stdout.trim(),
+            },
+          ],
+        };
+      }
+    )
+  );
+
+  logger.info('Tags and aliases tools registered', { count: 4 });
 }