feat(mcp): add doctor command

Add the MCP doctor subcommand with text and JSON output, config-only mode, and scope filtering so users can diagnose MCP issues from the CLI.

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

src/commands/mcp/doctorCommand.test.ts

@@ -0,0 +1,19 @@
+import assert from 'node:assert/strict'
+import test from 'node:test'
+
+import { Command } from '@commander-js/extra-typings'
+
+import { registerMcpDoctorCommand } from './doctorCommand.js'
+
+test('registerMcpDoctorCommand adds the doctor subcommand with expected options', () => {
+  const mcp = new Command('mcp')
+
+  registerMcpDoctorCommand(mcp)
+
+  const doctor = mcp.commands.find(command => command.name() === 'doctor')
+  assert.ok(doctor)
+  assert.equal(doctor?.usage(), '[options] [name]')
+
+  const optionFlags = doctor?.options.map(option => option.long)
+  assert.deepEqual(optionFlags, ['--scope', '--config-only', '--json'])
+})

src/commands/mcp/doctorCommand.ts

@@ -0,0 +1,25 @@
+/**
+ * MCP doctor CLI subcommand.
+ */
+import { type Command } from '@commander-js/extra-typings'
+
+export function registerMcpDoctorCommand(mcp: Command): void {
+  mcp
+    .command('doctor [name]')
+    .description(
+      'Diagnose MCP configuration, precedence, disabled/pending state, and connection health. ' +
+        'Note: unless --config-only is used, stdio servers may be spawned and remote servers may be contacted. ' +
+        'Only use this command in directories you trust.',
+    )
+    .option('-s, --scope <scope>', 'Restrict config analysis to a specific scope (local, project, user, or enterprise)')
+    .option('--config-only', 'Skip live connection checks and only analyze configuration state')
+    .option('--json', 'Output the diagnostics report as JSON')
+    .action(async (name: string | undefined, options: {
+      scope?: string
+      configOnly?: boolean
+      json?: boolean
+    }) => {
+      const { mcpDoctorHandler } = await import('../../cli/handlers/mcp.js')
+      await mcpDoctorHandler(name, options)
+    })
+}