@W-21199544 MCP reload config before every tool call

Author: patricksullivansf

packages/b2c-dx-mcp/src/commands/mcp.ts

@@ -277,6 +277,20 @@ export default class McpServerCommand extends BaseCommand<typeof McpServerComman
     return loadConfig(flagConfig, options);
   }
 
+  /**
+   * Loads configuration and creates a new Services instance.
+   *
+   * This method loads configuration files (dw.json, ~/.mobify) on each call,
+   * allowing tools to pick up changes to configuration between invocations.
+   * Flags remain the same (parsed once at startup).
+   *
+   * @returns A new Services instance with loaded configuration
+   */
+  protected loadServices(): Services {
+    const config = this.loadConfiguration();
+    return Services.fromResolvedConfig(config);
+  }
+
   /**
    * Main entry point - starts the MCP server.
    *
@@ -336,11 +350,9 @@ export default class McpServerCommand extends BaseCommand<typeof McpServerComman
       },
     );
 
-    // Create services from already-resolved config (BaseCommand.init() already resolved it)
-    const services = Services.fromResolvedConfig(this.resolvedConfig);
-
-    // Register toolsets
-    await registerToolsets(startupFlags, server, services);
+    // Register toolsets with loader function that loads config and creates Services on each tool call
+    // This allows tools to pick up changes to config files (dw.json, ~/.mobify) between invocations
+    await registerToolsets(startupFlags, server, this.loadServices.bind(this));
 
     // Connect to stdio transport
     const transport = new StdioServerTransport();

packages/b2c-dx-mcp/src/registry.ts

@@ -76,10 +76,10 @@ export type ToolRegistry = Record<Toolset, McpTool[]>;
  * Tools are organized by their declared `toolsets` array, allowing
  * a single tool to appear in multiple toolsets.
  *
- * @param services - Services instance for dependency injection
+ * @param loadServices - Function that loads configuration and returns Services instance
  * @returns Complete tool registry
  */
-export function createToolRegistry(services: Services): ToolRegistry {
+export function createToolRegistry(loadServices: () => Services): ToolRegistry {
   const registry: ToolRegistry = {
     CARTRIDGES: [],
     MRT: [],
@@ -90,11 +90,11 @@ export function createToolRegistry(services: Services): ToolRegistry {
 
   // Collect all tools from all factories
   const allTools: McpTool[] = [
-    ...createCartridgesTools(services),
-    ...createMrtTools(services),
-    ...createPwav3Tools(services),
-    ...createScapiTools(services),
-    ...createStorefrontNextTools(services),
+    ...createCartridgesTools(loadServices),
+    ...createMrtTools(loadServices),
+    ...createPwav3Tools(loadServices),
+    ...createScapiTools(loadServices),
+    ...createStorefrontNextTools(loadServices),
   ];
 
   // Organize tools by their declared toolsets (supports multi-toolset)
@@ -167,16 +167,20 @@ async function performAutoDiscovery(flags: StartupFlags, reason: string): Promis
  *
  * @param flags - Startup flags from CLI
  * @param server - B2CDxMcpServer instance
- * @param services - Services instance
+ * @param loadServices - Function that loads configuration and returns Services instance
  */
-export async function registerToolsets(flags: StartupFlags, server: B2CDxMcpServer, services: Services): Promise<void> {
+export async function registerToolsets(
+  flags: StartupFlags,
+  server: B2CDxMcpServer,
+  loadServices: () => Services,
+): Promise<void> {
   const toolsets = flags.toolsets ?? [];
   const individualTools = flags.tools ?? [];
   const allowNonGaTools = flags.allowNonGaTools ?? false;
   const logger = getLogger();
 
   // Create the tool registry (all available tools)
-  const toolRegistry = createToolRegistry(services);
+  const toolRegistry = createToolRegistry(loadServices);
 
   // Build flat list of all tools for lookup
   const allTools = Object.values(toolRegistry).flat();

packages/b2c-dx-mcp/src/tools/adapter.ts

@@ -9,22 +9,22 @@
  *
  * This module provides utilities for creating standardized MCP tools that:
  * - Validate input using Zod schemas
- * - Inject pre-resolved B2CInstance for WebDAV/OCAPI operations (requiresInstance)
- * - Inject pre-resolved MRT auth for MRT API operations (requiresMrtAuth)
+ * - Inject loaded B2CInstance for WebDAV/OCAPI operations (requiresInstance)
+ * - Inject loaded MRT auth for MRT API operations (requiresMrtAuth)
  * - Format output consistently (textResult, jsonResult, errorResult)
  *
  * ## Configuration Resolution
  *
- * Both B2C instance and MRT auth are resolved once at server startup via
- * {@link Services.fromResolvedConfig} and reused for all tool calls:
+ * Both B2C instance and MRT auth are loaded before each tool call via
+ * a loader function that calls {@link Services.fromResolvedConfig}:
  *
- * - **B2CInstance**: Resolved from flags + dw.json. Available when `requiresInstance: true`.
- * - **MRT Auth**: Resolved from --api-key → SFCC_MRT_API_KEY → ~/.mobify. Available when `requiresMrtAuth: true`.
+ * - **B2CInstance**: Loaded from flags + dw.json on each call. Available when `requiresInstance: true`.
+ * - **MRT Auth**: Loaded from --api-key → SFCC_MRT_API_KEY → ~/.mobify on each call. Available when `requiresMrtAuth: true`.
  *
- * This "resolve eagerly at startup" pattern provides:
- * - Fail-fast behavior (configuration errors surface at startup)
- * - Consistent mental model (both resolved the same way)
- * - Better performance (no resolution on each tool call)
+ * This "load on each call" pattern provides:
+ * - Fresh configuration on each tool invocation (picks up changes to config files)
+ * - Consistent mental model (both loaded the same way)
+ * - Tools can respond to configuration changes without server restart
  *
  * @module tools/adapter
  *
@@ -48,8 +48,11 @@
  *
  * @example MRT tool (MRT API)
  * ```typescript
- * // Services created from already-resolved config at startup
- * const services = Services.fromResolvedConfig(this.resolvedConfig);
+ * // Loader function that loads config and creates Services on each tool call
+ * const loadServices = () => {
+ *   const config = this.loadConfiguration();
+ *   return Services.fromResolvedConfig(config);
+ * };
  *
  * const mrtTool = createToolAdapter({
  *   name: 'mrt_bundle_push',
@@ -59,12 +62,12 @@
  *   inputSchema: {
  *     projectSlug: z.string().describe('MRT project slug'),
  *   },
- *   execute: async (args, { mrtAuth }) => {
- *     const result = await pushBundle({ projectSlug: args.projectSlug }, mrtAuth);
+ *   execute: async (args, { mrtConfig }) => {
+ *     const result = await pushBundle({ projectSlug: args.projectSlug }, mrtConfig.auth);
  *     return result;
  *   },
  *   formatOutput: (output) => jsonResult(output),
- * }, services);
+ * }, loadServices);
  * ```
  */
 
@@ -87,7 +90,7 @@ export interface ToolExecutionContext {
 
   /**
    * MRT configuration (auth, project, environment, origin).
-   * Pre-resolved at server startup.
+   * Loaded before each tool call.
    * Only populated when requiresMrtAuth is true.
    */
   mrtConfig?: MrtConfig;
@@ -222,31 +225,36 @@ function formatZodErrors(error: z.ZodError): string {
  * @template TInput - The validated input type (inferred from inputSchema)
  * @template TOutput - The output type from the execute function
  * @param options - Tool adapter configuration
- * @param services - Services instance for dependency injection
+ * @param loadServices - Function that loads configuration and returns Services instance
  * @returns An McpTool ready for registration
  *
  * @example
  * ```typescript
  * import { z } from 'zod';
  * import { createToolAdapter, jsonResult, errorResult } from './adapter.js';
  *
+ * const loadServices = () => {
+ *   const config = this.loadConfiguration();
+ *   return Services.fromResolvedConfig(config);
+ * };
+ *
  * const listCodeVersionsTool = createToolAdapter({
  *   name: 'code_version_list',
  *   description: 'List all code versions on the instance',
  *   toolsets: ['CARTRIDGES'],
  *   inputSchema: {},
- *   execute: async (_args, { instance }) => {
- *     const result = await instance.ocapi.GET('/code_versions', {});
+ *   execute: async (_args, { b2cInstance }) => {
+ *     const result = await b2cInstance.ocapi.GET('/code_versions', {});
  *     if (result.error) throw new Error(result.error.message);
  *     return result.data;
  *   },
  *   formatOutput: (data) => jsonResult(data),
- * }, services);
+ * }, loadServices);
  * ```
  */
 export function createToolAdapter<TInput, TOutput>(
   options: ToolAdapterOptions<TInput, TOutput>,
-  services: Services,
+  loadServices: () => Services,
 ): McpTool {
   const {
     name,
@@ -279,7 +287,10 @@ export function createToolAdapter<TInput, TOutput>(
       const args = parseResult.data as TInput;
 
       try {
-        // 2. Get B2CInstance if required (pre-resolved at startup)
+        // 2. Load Services to get fresh configuration (re-reads config files)
+        const services = loadServices();
+
+        // 3. Get B2CInstance if required (loaded on each call)
         let b2cInstance: B2CInstance | undefined;
         if (requiresInstance) {
           if (!services.b2cInstance) {
@@ -290,7 +301,7 @@ export function createToolAdapter<TInput, TOutput>(
           b2cInstance = services.b2cInstance;
         }
 
-        // 3. Get MRT config if required (pre-resolved at startup)
+        // 4. Get MRT config if required (loaded on each call)
         let mrtConfig: ToolExecutionContext['mrtConfig'];
         if (requiresMrtAuth) {
           if (!services.mrtConfig.auth) {
@@ -306,15 +317,15 @@ export function createToolAdapter<TInput, TOutput>(
           };
         }
 
-        // 4. Execute the operation
+        // 5. Execute the operation
         const context: ToolExecutionContext = {
           b2cInstance,
           mrtConfig,
           services,
         };
         const output = await execute(args, context);
 
-        // 5. Format output
+        // 6. Format output
         return formatOutput(output);
       } catch (error) {
         // Handle execution errors

packages/b2c-dx-mcp/src/tools/cartridges/index.ts

@@ -52,11 +52,11 @@ interface CartridgeToolInjections {
  * 3. Uploads the zip to WebDAV and triggers server-side unzip
  * 4. Optionally reloads the code version after deploy
  *
- * @param services - MCP services
+ * @param loadServices - Function that loads configuration and returns Services instance
  * @param injections - Optional dependency injections for testing
  * @returns The cartridge_deploy tool
  */
-function createCartridgeDeployTool(services: Services, injections?: CartridgeToolInjections): McpTool {
+function createCartridgeDeployTool(loadServices: () => Services, injections?: CartridgeToolInjections): McpTool {
   const findAndDeployCartridgesFn = injections?.findAndDeployCartridges || findAndDeployCartridges;
   return createToolAdapter<CartridgeDeployInput, DeployResult>(
     {
@@ -106,7 +106,7 @@ function createCartridgeDeployTool(services: Services, injections?: CartridgeToo
         const instance = context.b2cInstance!;
 
         // Default directory to current directory
-        const directory = args.directory || services.getWorkingDirectory();
+        const directory = args.directory || context.services.getWorkingDirectory();
 
         // Parse options
         const options: DeployOptions = {
@@ -134,17 +134,17 @@ function createCartridgeDeployTool(services: Services, injections?: CartridgeToo
       },
       formatOutput: (output) => jsonResult(output),
     },
-    services,
+    loadServices,
   );
 }
 
 /**
  * Creates all tools for the CARTRIDGES toolset.
  *
- * @param services - MCP services
+ * @param loadServices - Function that loads configuration and returns Services instance
  * @param injections - Optional dependency injections for testing
  * @returns Array of MCP tools
  */
-export function createCartridgesTools(services: Services, injections?: CartridgeToolInjections): McpTool[] {
-  return [createCartridgeDeployTool(services, injections)];
+export function createCartridgesTools(loadServices: () => Services, injections?: CartridgeToolInjections): McpTool[] {
+  return [createCartridgeDeployTool(loadServices, injections)];
 }

packages/b2c-dx-mcp/src/tools/mrt/index.ts

@@ -52,11 +52,11 @@ interface MrtToolInjections {
  * Expects the project to already be built (e.g., `npm run build` completed).
  * Shared across MRT, PWAV3, and STOREFRONTNEXT toolsets.
  *
- * @param services - MCP services
+ * @param loadServices - Function that loads configuration and returns Services instance
  * @param injections - Optional dependency injections for testing
  * @returns The mrt_bundle_push tool
  */
-function createMrtBundlePushTool(services: Services, injections?: MrtToolInjections): McpTool {
+function createMrtBundlePushTool(loadServices: () => Services, injections?: MrtToolInjections): McpTool {
   const pushBundleFn = injections?.pushBundle || pushBundle;
   return createToolAdapter<MrtBundlePushInput, PushResult>(
     {
@@ -97,7 +97,7 @@ function createMrtBundlePushTool(services: Services, injections?: MrtToolInjecti
         // Parse comma-separated glob patterns (same as CLI defaults)
         const ssrOnly = (args.ssrOnly || 'ssr.js,ssr.mjs,server/**/*').split(',').map((s) => s.trim());
         const ssrShared = (args.ssrShared || 'static/**/*,client/**/*').split(',').map((s) => s.trim());
-        const buildDirectory = args.buildDirectory || path.join(services.getWorkingDirectory(), 'build');
+        const buildDirectory = args.buildDirectory || path.join(context.services.getWorkingDirectory(), 'build');
 
         // Log all computed variables before pushing bundle
         const logger = getLogger();
@@ -133,17 +133,17 @@ function createMrtBundlePushTool(services: Services, injections?: MrtToolInjecti
       },
       formatOutput: (output) => jsonResult(output),
     },
-    services,
+    loadServices,
   );
 }
 
 /**
  * Creates all tools for the MRT toolset.
  *
- * @param services - MCP services
+ * @param loadServices - Function that loads configuration and returns Services instance
  * @param injections - Optional dependency injections for testing
  * @returns Array of MCP tools
  */
-export function createMrtTools(services: Services, injections?: MrtToolInjections): McpTool[] {
-  return [createMrtBundlePushTool(services, injections)];
+export function createMrtTools(loadServices: () => Services, injections?: MrtToolInjections): McpTool[] {
+  return [createMrtBundlePushTool(loadServices, injections)];
 }