diff --git a/mcp-server/tools/modules/index.js b/mcp-server/tools/modules/index.js
index b4323f1..94b2f7f 100644
--- a/mcp-server/tools/modules/index.js
+++ b/mcp-server/tools/modules/index.js
@@ -2,6 +2,7 @@ import { registerCheckModuleTool } from './check.js';
 import { registerCheckModuleUsageTool } from './checkUsage.js';
 import { registerCompileModuleTool } from './compile.js';
 import { registerDeleteModuleTool } from './delete.js';
+import { registerUpdateModuleMetadataTool } from './updateMetadata.js';
 import { canEditCode } from '../helpers/roleCheck.js';
 
 export function registerModuleTools(server) {
@@ -10,5 +11,6 @@ export function registerModuleTools(server) {
     if (canEditCode()) {
         registerCompileModuleTool(server);
         registerDeleteModuleTool(server);
+        registerUpdateModuleMetadataTool(server);
     }
 }
diff --git a/mcp-server/tools/modules/updateMetadata.js b/mcp-server/tools/modules/updateMetadata.js
new file mode 100644
index 0000000..e3a9495
--- /dev/null
+++ b/mcp-server/tools/modules/updateMetadata.js
@@ -0,0 +1,88 @@
+import { z } from "zod";
+import { withAuth } from "../../auth/index.js";
+import { withAuthParams } from "../helpers/authSchema.js";
+import { handleToolError } from "../helpers/errorHandler.js";
+import { pythonPost } from "../helpers/pythonServerClient.js";
+import { getCurrentProjectInfo } from "../files/helpers.js";
+
+// Tool: update_module_metadata
+// Edita la metadata de builder.json de un modulo (label, description,
+// onlyAdminModule, MJMLModule) delegando en /api/modules/update-metadata.
+// El id/carpeta del modulo NO se puede renombrar y el endpoint rechaza los
+// modulos generados del layout (custom-header/footer[-twig]).
+
+// Claves editables del builder.json. Se envian solo las que llegan definidas,
+// de modo que el endpoint hace un merge parcial y no pisa el resto.
+const EDITABLE_KEYS = ["label", "description", "onlyAdminModule", "MJMLModule"];
+
+export function registerUpdateModuleMetadataTool(server) {
+    server.tool(
+        "update_module_metadata",
+        `Edit a module's metadata in its builder.json: 'label' (display name shown in the visual builder), 'description' (short help text for editors), 'onlyAdminModule' (true = the module is only visible to admin users in the builder), 'MJMLModule' (true = the module is an email/MJML module).
+
+The module id (its folder name under template/estandar/modulos/) CANNOT be renamed with this tool — there is no rename option at all. Only the fields above change; everything else in builder.json is preserved.
+
+At least one of label, description, onlyAdminModule or MJMLModule is required. Fields you omit are left untouched.
+
+Not applicable to the generated layout modules (custom-header, custom-footer, custom-header-twig, custom-footer-twig): those are artifacts of the global layout and the request will be rejected — use set_layout_field for them.`,
+        withAuthParams({
+            module: z.string().min(1).describe("Module id (the folder name under template/estandar/modulos/). Cannot be renamed."),
+            label: z.string().optional().describe("Display name of the module in the visual builder"),
+            description: z.string().optional().describe("Short description shown to editors in the builder"),
+            onlyAdminModule: z.boolean().optional().describe("If true, the module is only visible to admin users in the builder"),
+            MJMLModule: z.boolean().optional().describe("If true, the module is treated as an email (MJML) module"),
+        }),
+        { readOnlyHint: false, destructiveHint: false },
+        withAuth(async ({ module, label, description, onlyAdminModule, MJMLModule }, _extra) => {
+            try {
+                const provided = { label, description, onlyAdminModule, MJMLModule };
+
+                // Validacion temprana: sin ninguna clave editable no tiene
+                // sentido llamar al endpoint. Ojo con los booleanos false —
+                // se comprueba `undefined`, no truthiness.
+                const changedKeys = EDITABLE_KEYS.filter((key) => provided[key] !== undefined);
+                if (changedKeys.length === 0) {
+                    return handleToolError(
+                        `Nothing to update: provide at least one of ${EDITABLE_KEYS.join(", ")}. The module id cannot be renamed with this tool.`,
+                        "update_module_metadata",
+                        { module, editableFields: EDITABLE_KEYS }
+                    );
+                }
+
+                const { projectSlug } = getCurrentProjectInfo();
+
+                const body = { project: projectSlug, module };
+                for (const key of changedKeys) body[key] = provided[key];
+
+                const result = await pythonPost("/api/modules/update-metadata", body);
+
+                if (!result?.success) {
+                    return {
+                        content: [{
+                            type: "text",
+                            text: JSON.stringify({
+                                success: false,
+                                error: result?.error || "Could not update module metadata",
+                            }),
+                        }],
+                        isError: true,
+                    };
+                }
+
+                return {
+                    content: [{
+                        type: "text",
+                        text: JSON.stringify({
+                            success: true,
+                            module: result.module || module,
+                            updatedFields: changedKeys,
+                            metadata: result.metadata || {},
+                        }, null, 2),
+                    }],
+                };
+            } catch (error) {
+                return handleToolError(error, "update_module_metadata", { module });
+            }
+        })
+    );
+}