Need to override json limit defaults for express body parser in createMcpExpressApp()

[AntMarras]

Hi! 👋

Firstly, thanks for your work on this project! 🙂

Today I used patch-package to patch @modelcontextprotocol/sdk@1.25.1 for the project I'm working on.

The createMcpExpressApp() use the json bodyparser with default limit of 100kb because it is not possible to pass a limit size as option.

Here is the diff that solved my problem:

diff --git a/node_modules/@modelcontextprotocol/sdk/dist/esm/server/express.d.ts b/node_modules/@modelcontextprotocol/sdk/dist/esm/server/express.d.ts
index 7746e82..824b80f 100644
--- a/node_modules/@modelcontextprotocol/sdk/dist/esm/server/express.d.ts
+++ b/node_modules/@modelcontextprotocol/sdk/dist/esm/server/express.d.ts
@@ -17,6 +17,8 @@ export interface CreateMcpExpressAppOptions {
      * to restrict which hostnames are allowed.
      */
     allowedHosts?: string[];
+    /** Controls the maximum request body size. */
+    limit?: string;
 }
 /**
  * Creates an Express application pre-configured for MCP servers.
diff --git a/node_modules/@modelcontextprotocol/sdk/dist/esm/server/express.js b/node_modules/@modelcontextprotocol/sdk/dist/esm/server/express.js
index a23a57b..0ad4703 100644
--- a/node_modules/@modelcontextprotocol/sdk/dist/esm/server/express.js
+++ b/node_modules/@modelcontextprotocol/sdk/dist/esm/server/express.js
@@ -24,9 +24,9 @@ import { hostHeaderValidation, localhostHostValidation } from './middleware/host
  * ```
  */
 export function createMcpExpressApp(options = {}) {
-    const { host = '127.0.0.1', allowedHosts } = options;
+    const { host = '127.0.0.1', allowedHosts, limit } = options;
     const app = express();
-    app.use(express.json());
+    limit ? app.use(express.json({ limit })) : app.use(express.json());
     // If allowedHosts is explicitly provided, use that for validation
     if (allowedHosts) {
         app.use(hostHeaderValidation(allowedHosts));

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