feat: add MCP server support for AI agents

Add Model Context Protocol (MCP) server integration to extend AI agent
capabilities with external tools. This allows users to configure MCP
servers (stdio, SSE, HTTP) in global settings and have agents use them.

Note: MCP servers are currently configured globally. Per-project MCP
server configuration is planned for a future update.

Features:
- New MCP Servers settings section with full CRUD operations
- Import/Export JSON configs (Claude Code format compatible)
- Configurable permission settings:
  - Auto-approve MCP tools (bypass permission prompts)
  - Unrestricted tools (allow all tools when MCP enabled)
- Refresh button to reload from settings file

Implementation:
- Added MCPServerConfig and MCPToolInfo types
- Added store actions for MCP server management
- Updated claude-provider to use configurable MCP permissions
- Updated sdk-options factory functions for MCP support
- Added settings helpers for loading MCP configs

apps/server/src/lib/settings-helpers.ts

@@ -4,6 +4,7 @@
 
 import type { SettingsService } from '../services/settings-service.js';
 import type { ContextFilesResult, ContextFileInfo } from '@automaker/utils';
+import type { MCPServerConfig, McpServerConfig } from '@automaker/types';
 
 /**
  * Get the autoLoadClaudeMd setting, with project settings taking precedence over global.
@@ -136,3 +137,120 @@ function formatContextFileEntry(file: ContextFileInfo): string {
   const descriptionInfo = file.description ? `\n**Purpose:** ${file.description}` : '';
   return `${header}\n${pathInfo}${descriptionInfo}\n\n${file.content}`;
 }
+
+/**
+ * Get enabled MCP servers from global settings, converted to SDK format.
+ * Returns an empty object if settings service is not available or no servers are configured.
+ *
+ * @param settingsService - Optional settings service instance
+ * @param logPrefix - Prefix for log messages (e.g., '[AgentService]')
+ * @returns Promise resolving to MCP servers in SDK format (keyed by name)
+ */
+export async function getMCPServersFromSettings(
+  settingsService?: SettingsService | null,
+  logPrefix = '[SettingsHelper]'
+): Promise<Record<string, McpServerConfig>> {
+  if (!settingsService) {
+    return {};
+  }
+
+  try {
+    const globalSettings = await settingsService.getGlobalSettings();
+    const mcpServers = globalSettings.mcpServers || [];
+
+    // Filter to only enabled servers and convert to SDK format
+    const enabledServers = mcpServers.filter((s) => s.enabled !== false);
+
+    if (enabledServers.length === 0) {
+      return {};
+    }
+
+    // Convert settings format to SDK format (keyed by name)
+    const sdkServers: Record<string, McpServerConfig> = {};
+    for (const server of enabledServers) {
+      sdkServers[server.name] = convertToSdkFormat(server);
+    }
+
+    console.log(
+      `${logPrefix} Loaded ${enabledServers.length} MCP server(s): ${enabledServers.map((s) => s.name).join(', ')}`
+    );
+
+    return sdkServers;
+  } catch (error) {
+    console.error(`${logPrefix} Failed to load MCP servers setting:`, error);
+    return {};
+  }
+}
+
+/**
+ * Get MCP permission settings from global settings.
+ *
+ * @param settingsService - Optional settings service instance
+ * @param logPrefix - Prefix for log messages (e.g., '[AgentService]')
+ * @returns Promise resolving to MCP permission settings
+ */
+export async function getMCPPermissionSettings(
+  settingsService?: SettingsService | null,
+  logPrefix = '[SettingsHelper]'
+): Promise<{ mcpAutoApproveTools: boolean; mcpUnrestrictedTools: boolean }> {
+  // Default values (both enabled for backwards compatibility)
+  const defaults = { mcpAutoApproveTools: true, mcpUnrestrictedTools: true };
+
+  if (!settingsService) {
+    return defaults;
+  }
+
+  try {
+    const globalSettings = await settingsService.getGlobalSettings();
+    const result = {
+      mcpAutoApproveTools: globalSettings.mcpAutoApproveTools ?? true,
+      mcpUnrestrictedTools: globalSettings.mcpUnrestrictedTools ?? true,
+    };
+    console.log(
+      `${logPrefix} MCP permission settings: autoApprove=${result.mcpAutoApproveTools}, unrestricted=${result.mcpUnrestrictedTools}`
+    );
+    return result;
+  } catch (error) {
+    console.error(`${logPrefix} Failed to load MCP permission settings:`, error);
+    return defaults;
+  }
+}
+
+/**
+ * Convert a settings MCPServerConfig to SDK McpServerConfig format.
+ * Validates required fields and throws informative errors if missing.
+ */
+function convertToSdkFormat(server: MCPServerConfig): McpServerConfig {
+  if (server.type === 'sse') {
+    if (!server.url) {
+      throw new Error(`SSE MCP server "${server.name}" is missing a URL.`);
+    }
+    return {
+      type: 'sse',
+      url: server.url,
+      headers: server.headers,
+    };
+  }
+
+  if (server.type === 'http') {
+    if (!server.url) {
+      throw new Error(`HTTP MCP server "${server.name}" is missing a URL.`);
+    }
+    return {
+      type: 'http',
+      url: server.url,
+      headers: server.headers,
+    };
+  }
+
+  // Default to stdio
+  if (!server.command) {
+    throw new Error(`Stdio MCP server "${server.name}" is missing a command.`);
+  }
+  return {
+    type: 'stdio',
+    command: server.command,
+    args: server.args,
+    env: server.env,
+  };
+}