diff --git a/packages/cli/package.json b/packages/cli/package.json
index ceeb3d4144b..d6d535f4853 100644
--- a/packages/cli/package.json
+++ b/packages/cli/package.json
@@ -140,8 +140,8 @@
     "@joplin/turndown-plugin-gfm": "catalog:",
     "@langchain/core": "catalog:",
     "@modelcontextprotocol/node": "catalog:",
-    "@modelcontextprotocol/sdk": "catalog:",
     "@modelcontextprotocol/server": "catalog:",
+    "@modelcontextprotocol/server-legacy": "catalog:",
     "@mozilla/readability": "catalog:",
     "@n8n/agents": "workspace:*",
     "@n8n/ai-node-sdk": "workspace:*",
diff --git a/packages/cli/src/modules/oauth-server/__tests__/oauth-authorization-code.service.test.ts b/packages/cli/src/modules/oauth-server/__tests__/oauth-authorization-code.service.test.ts
index db15dbaee2d..6280c22b169 100644
--- a/packages/cli/src/modules/oauth-server/__tests__/oauth-authorization-code.service.test.ts
+++ b/packages/cli/src/modules/oauth-server/__tests__/oauth-authorization-code.service.test.ts
@@ -1,5 +1,5 @@
 import type { Mocked } from 'vitest';
-import { InvalidGrantError } from '@modelcontextprotocol/sdk/server/auth/errors.js';
+import { InvalidGrantError } from '@modelcontextprotocol/server-legacy/auth';
 import { mockInstance } from '@n8n/backend-test-utils';
 import { mock } from 'vitest-mock-extended';
 
diff --git a/packages/cli/src/modules/oauth-server/__tests__/oauth-consent.controller.api.test.ts b/packages/cli/src/modules/oauth-server/__tests__/oauth-consent.controller.api.test.ts
index b49e0706fde..5fef61081a5 100644
--- a/packages/cli/src/modules/oauth-server/__tests__/oauth-consent.controller.api.test.ts
+++ b/packages/cli/src/modules/oauth-server/__tests__/oauth-consent.controller.api.test.ts
@@ -288,7 +288,7 @@ describe('POST /rest/consent/approve', () => {
 		expect(redirectUrl.searchParams.get('code')?.length).toBeGreaterThan(32);
 		expect(redirectUrl.searchParams.get('state')).toBe('test-state');
 		expect(redirectUrl.searchParams.get('iss')).toBe(
-			Container.get(UrlService).getInstanceBaseUrl(),
+			new URL(Container.get(UrlService).getInstanceBaseUrl()).href,
 		);
 	});
 
@@ -310,7 +310,7 @@ describe('POST /rest/consent/approve', () => {
 		expect(redirectUrl.searchParams.get('error_description')).toBeTruthy();
 		expect(redirectUrl.searchParams.get('state')).toBe('test-state');
 		expect(redirectUrl.searchParams.get('iss')).toBe(
-			Container.get(UrlService).getInstanceBaseUrl(),
+			new URL(Container.get(UrlService).getInstanceBaseUrl()).href,
 		);
 	});
 
diff --git a/packages/cli/src/modules/oauth-server/__tests__/oauth-consent.service.test.ts b/packages/cli/src/modules/oauth-server/__tests__/oauth-consent.service.test.ts
index e044d02b37f..e8f96a69ddc 100644
--- a/packages/cli/src/modules/oauth-server/__tests__/oauth-consent.service.test.ts
+++ b/packages/cli/src/modules/oauth-server/__tests__/oauth-consent.service.test.ts
@@ -345,7 +345,7 @@ describe('OAuthConsentService', () => {
 				'error_description=User+denied+the+authorization+request',
 			);
 			expect(result.redirectUrl).toContain('state=state-xyz');
-			expect(new URL(result.redirectUrl).searchParams.get('iss')).toBe(issuer);
+			expect(new URL(result.redirectUrl).searchParams.get('iss')).toBe(new URL(issuer).href);
 			expect(logger.info).toHaveBeenCalledWith('Consent denied', {
 				clientId: 'client-123',
 				userId: 'user-123',
@@ -379,7 +379,7 @@ describe('OAuthConsentService', () => {
 
 			expect(result.redirectUrl).toContain('code=generated-auth-code');
 			expect(result.redirectUrl).toContain('state=state-xyz');
-			expect(new URL(result.redirectUrl).searchParams.get('iss')).toBe(issuer);
+			expect(new URL(result.redirectUrl).searchParams.get('iss')).toBe(new URL(issuer).href);
 			expect(userConsentRepository.upsert).toHaveBeenCalledWith(
 				{
 					userId: 'user-123',
diff --git a/packages/cli/src/modules/oauth-server/__tests__/oauth-server.service.test.ts b/packages/cli/src/modules/oauth-server/__tests__/oauth-server.service.test.ts
index 519f95d36f8..b1315a48777 100644
--- a/packages/cli/src/modules/oauth-server/__tests__/oauth-server.service.test.ts
+++ b/packages/cli/src/modules/oauth-server/__tests__/oauth-server.service.test.ts
@@ -1,7 +1,4 @@
-import {
-	InvalidGrantError,
-	InvalidTargetError,
-} from '@modelcontextprotocol/sdk/server/auth/errors.js';
+import { InvalidGrantError, InvalidTargetError } from '@modelcontextprotocol/server-legacy/auth';
 import { Logger, type ModuleRegistry } from '@n8n/backend-common';
 import { mockInstance } from '@n8n/backend-test-utils';
 import { GlobalConfig } from '@n8n/config';
diff --git a/packages/cli/src/modules/oauth-server/__tests__/oauth.controller.api.test.ts b/packages/cli/src/modules/oauth-server/__tests__/oauth.controller.api.test.ts
index 0ac5a2a4ed9..7bec873753d 100644
--- a/packages/cli/src/modules/oauth-server/__tests__/oauth.controller.api.test.ts
+++ b/packages/cli/src/modules/oauth-server/__tests__/oauth.controller.api.test.ts
@@ -63,10 +63,13 @@ describe('GET /.well-known/oauth-authorization-server', () => {
 		} = response.body;
 
 		expect(issuer).toMatch(/^https?:\/\//);
-		expect(authorization_endpoint).toBe(`${issuer}/mcp-oauth/authorize`);
-		expect(token_endpoint).toBe(`${issuer}/mcp-oauth/token`);
-		expect(registration_endpoint).toBe(`${issuer}/mcp-oauth/register`);
-		expect(revocation_endpoint).toBe(`${issuer}/mcp-oauth/revoke`);
+		// `issuer` is the canonical RFC 9207 form (trailing slash for an origin-only
+		// base URL); the endpoints are built from the bare base URL, so trim it.
+		const origin = issuer.replace(/\/$/, '');
+		expect(authorization_endpoint).toBe(`${origin}/mcp-oauth/authorize`);
+		expect(token_endpoint).toBe(`${origin}/mcp-oauth/token`);
+		expect(registration_endpoint).toBe(`${origin}/mcp-oauth/register`);
+		expect(revocation_endpoint).toBe(`${origin}/mcp-oauth/revoke`);
 	});
 
 	test('should include all required OAuth 2.1 fields', async () => {
@@ -461,7 +464,7 @@ describe('GET /mcp-oauth/authorize', () => {
 		expect(redirectUrl.origin + redirectUrl.pathname).toBe('https://example.com/callback');
 		expect(redirectUrl.searchParams.get('error')).toBe('invalid_request');
 		expect(redirectUrl.searchParams.get('iss')).toBe(
-			Container.get(UrlService).getInstanceBaseUrl(),
+			new URL(Container.get(UrlService).getInstanceBaseUrl()).href,
 		);
 	});
 });
@@ -672,7 +675,7 @@ describe('Full authorization-code flow (PKCE)', () => {
 		expect(code).toBeTruthy();
 		expect(redirectUrl.searchParams.get('state')).toBe('flow-state');
 		expect(redirectUrl.searchParams.get('iss')).toBe(
-			Container.get(UrlService).getInstanceBaseUrl(),
+			new URL(Container.get(UrlService).getInstanceBaseUrl()).href,
 		);
 
 		// 4. Token exchange
diff --git a/packages/cli/src/modules/oauth-server/__tests__/oauth.controller.test.ts b/packages/cli/src/modules/oauth-server/__tests__/oauth.controller.test.ts
index ffef6f50fe3..b29b21cf41c 100644
--- a/packages/cli/src/modules/oauth-server/__tests__/oauth.controller.test.ts
+++ b/packages/cli/src/modules/oauth-server/__tests__/oauth.controller.test.ts
@@ -1,4 +1,4 @@
-import type { OAuthRegisteredClientsStore } from '@modelcontextprotocol/sdk/server/auth/clients.js';
+import type { OAuthRegisteredClientsStore } from '@modelcontextprotocol/server-legacy/auth';
 import { mockInstance } from '@n8n/backend-test-utils';
 import type { Request, Response } from 'express';
 import { mock } from 'vitest-mock-extended';
@@ -108,7 +108,8 @@ describe('OAuthController', () => {
 			expect(res.json).toHaveBeenCalledWith({
 				resource: 'https://n8n.test/mcp-server/http',
 				bearer_methods_supported: ['header'],
-				authorization_servers: ['https://n8n.test'],
+				// Canonical issuer form (trailing slash for an origin-only base URL).
+				authorization_servers: ['https://n8n.test/'],
 				scopes_supported: scopes,
 			});
 		});
diff --git a/packages/cli/src/modules/oauth-server/__tests__/oauth.helpers.test.ts b/packages/cli/src/modules/oauth-server/__tests__/oauth.helpers.test.ts
index aa8d5bc68f6..d03641c093a 100644
--- a/packages/cli/src/modules/oauth-server/__tests__/oauth.helpers.test.ts
+++ b/packages/cli/src/modules/oauth-server/__tests__/oauth.helpers.test.ts
@@ -185,37 +185,22 @@ describe('OAuthHelpers', () => {
 		});
 	});
 
-	describe('setIssuerParam', () => {
-		it('should set iss on an absolute URL without one', () => {
-			const result = OAuthHelpers.setIssuerParam('https://example.com/callback', issuer);
-
-			expect(new URL(result).searchParams.get('iss')).toBe(issuer);
-		});
-
-		it('should preserve existing query parameters', () => {
-			const result = OAuthHelpers.setIssuerParam(
-				'https://example.com/callback?error=invalid_request&state=state-xyz',
-				issuer,
+	describe('canonicalIssuer', () => {
+		it('appends a trailing slash to an origin-only base URL', () => {
+			expect(OAuthHelpers.canonicalIssuer('https://n8n.example.com')).toBe(
+				'https://n8n.example.com/',
 			);
-
-			const url = new URL(result);
-			expect(url.searchParams.get('error')).toBe('invalid_request');
-			expect(url.searchParams.get('state')).toBe('state-xyz');
-			expect(url.searchParams.get('iss')).toBe(issuer);
 		});
 
-		it('should replace a pre-existing iss parameter with the server issuer', () => {
-			const result = OAuthHelpers.setIssuerParam(
-				'https://example.com/callback?iss=https%3A%2F%2Fother.example.com',
-				issuer,
+		it('leaves a base URL that already has a path untouched', () => {
+			expect(OAuthHelpers.canonicalIssuer('https://example.com/n8n')).toBe(
+				'https://example.com/n8n',
 			);
-
-			expect(new URL(result).searchParams.get('iss')).toBe(issuer);
-			expect(new URL(result).searchParams.getAll('iss')).toHaveLength(1);
 		});
 
-		it('should return relative URLs unchanged', () => {
-			expect(OAuthHelpers.setIssuerParam('/oauth/consent', issuer)).toBe('/oauth/consent');
+		it('matches the href form the authorize handler stamps as iss', () => {
+			const baseUrl = 'https://n8n.example.com';
+			expect(OAuthHelpers.canonicalIssuer(baseUrl)).toBe(new URL(baseUrl).href);
 		});
 	});
 });
diff --git a/packages/cli/src/modules/oauth-server/oauth-authorization-code.service.ts b/packages/cli/src/modules/oauth-server/oauth-authorization-code.service.ts
index c3381897126..8bf89889d5a 100644
--- a/packages/cli/src/modules/oauth-server/oauth-authorization-code.service.ts
+++ b/packages/cli/src/modules/oauth-server/oauth-authorization-code.service.ts
@@ -1,4 +1,4 @@
-import { InvalidGrantError } from '@modelcontextprotocol/sdk/server/auth/errors.js';
+import { InvalidGrantError } from '@modelcontextprotocol/server-legacy/auth';
 import { Time } from '@n8n/constants';
 import { Service } from '@n8n/di';
 import { randomBytes } from 'node:crypto';
diff --git a/packages/cli/src/modules/oauth-server/oauth-consent.service.ts b/packages/cli/src/modules/oauth-server/oauth-consent.service.ts
index 3874c1debc8..a88fc0cf3d0 100644
--- a/packages/cli/src/modules/oauth-server/oauth-consent.service.ts
+++ b/packages/cli/src/modules/oauth-server/oauth-consent.service.ts
@@ -160,7 +160,9 @@ export class OAuthConsentService {
 			throw new UserError('Invalid or expired session');
 		}
 
-		const issuer = this.urlService.getInstanceBaseUrl();
+		// Same canonical `href` form the authorize handler and metadata use, so
+		// the RFC 9207 `iss` on the consent redirect matches the advertised issuer.
+		const issuer = OAuthHelpers.canonicalIssuer(this.urlService.getInstanceBaseUrl());
 
 		if (!approved) {
 			const redirectUrl = OAuthHelpers.buildErrorRedirectUrl(
diff --git a/packages/cli/src/modules/oauth-server/oauth-flow.service.ts b/packages/cli/src/modules/oauth-server/oauth-flow.service.ts
index 229959f518d..81e8586ed84 100644
--- a/packages/cli/src/modules/oauth-server/oauth-flow.service.ts
+++ b/packages/cli/src/modules/oauth-server/oauth-flow.service.ts
@@ -1,4 +1,4 @@
-import { InvalidGrantError } from '@modelcontextprotocol/sdk/server/auth/errors.js';
+import { InvalidGrantError } from '@modelcontextprotocol/server-legacy/auth';
 import { Time } from '@n8n/constants';
 import { Service } from '@n8n/di';
 import { UserError, type N8nOAuth2FlowResult } from 'n8n-workflow';
diff --git a/packages/cli/src/modules/oauth-server/oauth-server.service.ts b/packages/cli/src/modules/oauth-server/oauth-server.service.ts
index 4941f1ab31b..b434f10402a 100644
--- a/packages/cli/src/modules/oauth-server/oauth-server.service.ts
+++ b/packages/cli/src/modules/oauth-server/oauth-server.service.ts
@@ -1,18 +1,15 @@
-import type { OAuthRegisteredClientsStore } from '@modelcontextprotocol/sdk/server/auth/clients.js';
-import {
-	InvalidGrantError,
-	InvalidTargetError,
-} from '@modelcontextprotocol/sdk/server/auth/errors.js';
-import type {
-	AuthorizationParams,
-	OAuthServerProvider,
-} from '@modelcontextprotocol/sdk/server/auth/provider.js';
-import type { AuthInfo } from '@modelcontextprotocol/sdk/server/auth/types.js';
 import type {
+	AuthInfo,
 	OAuthClientInformationFull,
 	OAuthTokens,
 	OAuthTokenRevocationRequest,
-} from '@modelcontextprotocol/sdk/shared/auth.js';
+} from '@modelcontextprotocol/server';
+import { InvalidGrantError, InvalidTargetError } from '@modelcontextprotocol/server-legacy/auth';
+import type {
+	AuthorizationParams,
+	OAuthRegisteredClientsStore,
+	OAuthServerProvider,
+} from '@modelcontextprotocol/server-legacy/auth';
 import type { McpClientConnectedPeriod, McpClientTypeFilter } from '@n8n/api-types';
 import { getMcpClientType, MCP_CLIENT_TYPE_FILTER_BUCKETS } from '@n8n/api-types';
 import { Logger } from '@n8n/backend-common';
diff --git a/packages/cli/src/modules/oauth-server/oauth-token.service.ts b/packages/cli/src/modules/oauth-server/oauth-token.service.ts
index 087398ea9db..a0ff6be4ee2 100644
--- a/packages/cli/src/modules/oauth-server/oauth-token.service.ts
+++ b/packages/cli/src/modules/oauth-server/oauth-token.service.ts
@@ -1,6 +1,5 @@
-import { InvalidGrantError } from '@modelcontextprotocol/sdk/server/auth/errors.js';
-import { AuthInfo } from '@modelcontextprotocol/sdk/server/auth/types.js';
-import { OAuthTokens } from '@modelcontextprotocol/sdk/shared/auth.js';
+import type { AuthInfo, OAuthTokens } from '@modelcontextprotocol/server';
+import { InvalidGrantError } from '@modelcontextprotocol/server-legacy/auth';
 import { Logger } from '@n8n/backend-common';
 import { Time } from '@n8n/constants';
 import { TransactionRunner, UserRepository } from '@n8n/db';
diff --git a/packages/cli/src/modules/oauth-server/oauth.controller.ts b/packages/cli/src/modules/oauth-server/oauth.controller.ts
index e7011ef4814..1d6b6412536 100644
--- a/packages/cli/src/modules/oauth-server/oauth.controller.ts
+++ b/packages/cli/src/modules/oauth-server/oauth.controller.ts
@@ -1,7 +1,9 @@
-import { authorizationHandler } from '@modelcontextprotocol/sdk/server/auth/handlers/authorize.js';
-import { clientRegistrationHandler } from '@modelcontextprotocol/sdk/server/auth/handlers/register.js';
-import { revocationHandler } from '@modelcontextprotocol/sdk/server/auth/handlers/revoke.js';
-import { tokenHandler } from '@modelcontextprotocol/sdk/server/auth/handlers/token.js';
+import {
+	authorizationHandler,
+	clientRegistrationHandler,
+	revocationHandler,
+	tokenHandler,
+} from '@modelcontextprotocol/server-legacy/auth';
 import { Logger } from '@n8n/backend-common';
 import { GlobalConfig } from '@n8n/config';
 import { Time } from '@n8n/constants';
@@ -57,32 +59,22 @@ const oauthClientLimitGuard: RequestHandler = async (_req, res, next) => {
 	next();
 };
 
-/**
- * The SDK's authorization handler redirects request-validation errors (e.g.
- * missing `code_challenge`) back to the client without the RFC 9207 `iss`
- * parameter, while our metadata advertises
- * `authorization_response_iss_parameter_supported`. Wrap `res.location`
- * (which `res.redirect` sets its target through) so every absolute-URL
- * redirect from the authorize route carries `iss` matching the advertised
- * issuer. Internal relative redirects (consent screen) pass through
- * untouched. Remove once `@modelcontextprotocol/sdk` ships
- * `authorizationHandler({ issuerUrl })` (on upstream main, unreleased as of
- * 1.29.0) and the catalog version is bumped past it.
- */
-const rfc9207IssuerParam: RequestHandler = (_req, res, next) => {
-	const originalLocation = res.location.bind(res);
-	res.location = (url: string) =>
-		originalLocation(OAuthHelpers.setIssuerParam(url, urlService.getInstanceBaseUrl()));
-	next();
-};
-
 // Built once and mounted under both the legacy `/mcp-oauth/*` paths (existing
 // DCR clients hold them in their stored discovery metadata) and the neutral
 // `/oauth/*` paths that future, non-MCP protected resources will advertise.
 const registerRouter = clientRegistrationHandler({
 	clientsStore: oauthServerService.clientsStore,
 }) as Router;
-const authorizeRouter = authorizationHandler({ provider: oauthServerService }) as Router;
+// `issuerUrl` makes the handler stamp the RFC 9207 `iss` parameter onto every
+// redirect it drives back to the client's validated `redirect_uri` — including
+// its own request-validation error redirects (e.g. missing `code_challenge`),
+// which is what our metadata's `authorization_response_iss_parameter_supported`
+// promises. Success redirects run through the consent flow, which sets `iss`
+// itself.
+const authorizeRouter = authorizationHandler({
+	provider: oauthServerService,
+	issuerUrl: new URL(urlService.getInstanceBaseUrl()),
+}) as Router;
 const tokenRouter = tokenHandler({ provider: oauthServerService }) as Router;
 const revokeRouter = revocationHandler({ provider: oauthServerService }) as Router;
 
@@ -101,7 +93,6 @@ const sharedEndpointRouters = (basePath: '/mcp-oauth' | '/oauth'): StaticRouterM
 		path: `${basePath}/authorize`,
 		router: authorizeRouter,
 		skipAuth: true,
-		middlewares: [rfc9207IssuerParam],
 		ipRateLimit: createIpRateLimit(
 			oauthServerConfig.rateLimitAuthorize,
 			5 * Time.minutes.toMilliseconds,
@@ -182,7 +173,9 @@ export class OAuthController {
 		const baseUrl = this.urlService.getInstanceBaseUrl();
 		const allScopes = this.resourceRegistry.getAllScopes();
 		const metadata: Record<string, unknown> = {
-			issuer: baseUrl,
+			// Canonical `href` form so it matches the RFC 9207 `iss` the authorize
+			// handler stamps onto redirects (see OAuthHelpers.canonicalIssuer).
+			issuer: OAuthHelpers.canonicalIssuer(baseUrl),
 			authorization_endpoint: `${baseUrl}/mcp-oauth/authorize`,
 			token_endpoint: `${baseUrl}/mcp-oauth/token`,
 			registration_endpoint: `${baseUrl}/mcp-oauth/register`,
@@ -294,7 +287,9 @@ export class OAuthController {
 		const metadata: Record<string, unknown> = {
 			resource: resource.getResourceUrl(),
 			bearer_methods_supported: ['header'],
-			authorization_servers: [baseUrl],
+			// Canonical issuer form so it matches the `issuer` in the
+			// authorization-server metadata a client cross-checks it against.
+			authorization_servers: [OAuthHelpers.canonicalIssuer(baseUrl)],
 		};
 
 		if (resource.scopes.length > 0) {
diff --git a/packages/cli/src/modules/oauth-server/oauth.errors.ts b/packages/cli/src/modules/oauth-server/oauth.errors.ts
index 1a2a8464e85..0880bc51060 100644
--- a/packages/cli/src/modules/oauth-server/oauth.errors.ts
+++ b/packages/cli/src/modules/oauth-server/oauth.errors.ts
@@ -1,4 +1,4 @@
-import { ServerError } from '@modelcontextprotocol/sdk/server/auth/errors.js';
+import { ServerError } from '@modelcontextprotocol/server-legacy/auth';
 
 import { AuthError } from '@/errors/response-errors/auth.error';
 
diff --git a/packages/cli/src/modules/oauth-server/oauth.helpers.ts b/packages/cli/src/modules/oauth-server/oauth.helpers.ts
index fd2f531e0da..812593955b5 100644
--- a/packages/cli/src/modules/oauth-server/oauth.helpers.ts
+++ b/packages/cli/src/modules/oauth-server/oauth.helpers.ts
@@ -2,6 +2,20 @@
  * Static utility functions for OAuth URL building
  */
 export class OAuthHelpers {
+	/**
+	 * Canonical RFC 8414/9207 issuer identifier for a given instance base URL.
+	 *
+	 * The `server-legacy/auth` authorize handler derives the RFC 9207 `iss`
+	 * parameter from `issuerUrl.href`, so an origin-only base URL comes back with
+	 * a trailing slash (`https://host` → `https://host/`). RFC 9207 requires the
+	 * `iss` on every authorization response to be byte-identical to the `issuer`
+	 * advertised in metadata, so the metadata document and the consent redirects
+	 * must use this same `href` normalization rather than the bare base URL.
+	 */
+	static canonicalIssuer(baseUrl: string): string {
+		return new URL(baseUrl).href;
+	}
+
 	/**
 	 * Build success redirect URL with authorization code
 	 * Used when user approves consent
@@ -47,19 +61,4 @@ export class OAuthHelpers {
 		targetUrl.searchParams.set('iss', issuer);
 		return targetUrl.toString();
 	}
-
-	/**
-	 * Set the RFC 9207 `iss` parameter on an absolute redirect URL, replacing
-	 * any pre-existing value (e.g. one baked into the client's registered
-	 * redirect URI) so the response always asserts this server's identity.
-	 * Relative URLs (internal redirects, e.g. to the consent screen) are
-	 * returned unchanged.
-	 */
-	static setIssuerParam(url: string, issuer: string): string {
-		if (!URL.canParse(url)) return url;
-
-		const targetUrl = new URL(url);
-		targetUrl.searchParams.set('iss', issuer);
-		return targetUrl.toString();
-	}
 }
diff --git a/pnpm-lock.yaml b/pnpm-lock.yaml
index 13365d9a9f6..e2e778c8eea 100644
--- a/pnpm-lock.yaml
+++ b/pnpm-lock.yaml
@@ -150,6 +150,9 @@ catalogs:
     '@modelcontextprotocol/server':
       specifier: 2.0.0
       version: 2.0.0
+    '@modelcontextprotocol/server-legacy':
+      specifier: 2.0.0
+      version: 2.0.0
     '@mozilla/readability':
       specifier: ^0.6.0
       version: 0.6.0
@@ -4084,12 +4087,12 @@ importers:
       '@modelcontextprotocol/node':
         specifier: 'catalog:'
         version: 2.0.0(@modelcontextprotocol/server@2.0.0)(hono@4.12.27)
-      '@modelcontextprotocol/sdk':
-        specifier: 'catalog:'
-        version: 1.26.0(zod@3.25.76)
       '@modelcontextprotocol/server':
         specifier: 'catalog:'
         version: 2.0.0
+      '@modelcontextprotocol/server-legacy':
+        specifier: 'catalog:'
+        version: 2.0.0(express@5.1.0)
       '@mozilla/readability':
         specifier: 'catalog:'
         version: 0.6.0
@@ -9999,6 +10002,16 @@ packages:
       '@cfworker/json-schema':
         optional: true
 
+  '@modelcontextprotocol/server-legacy@2.0.0':
+    resolution: {integrity: sha512-LnffC1BSqFMHtMQxEz92lqDpHWma+ErV3ghdHDgdkCyYzVcCYKcUT5loq4kflty+Bf9C9qjJqbnphyBWyCqo8Q==}
+    engines: {node: '>=20'}
+    deprecated: This package is a frozen copy of v1's SSE transport and OAuth Authorization Server helpers for migration purposes only. Use StreamableHTTP from @modelcontextprotocol/server and a dedicated OAuth server in production. Will not receive new features.
+    peerDependencies:
+      express: ^4.18.0 || ^5.0.0
+    peerDependenciesMeta:
+      express:
+        optional: true
+
   '@modelcontextprotocol/server@2.0.0':
     resolution: {integrity: sha512-YhHWdHfpFMQfd0prsEnxKeS3Qz3ytIGmsS0sth4KDjnacIT7hxk6hXHkJ9KysxlkvTM+WZAtQbbcUhdoP4Hvtw==}
     engines: {node: '>=20'}
@@ -27343,6 +27356,18 @@ snapshots:
     transitivePeerDependencies:
       - supports-color
 
+  '@modelcontextprotocol/server-legacy@2.0.0(express@5.1.0)':
+    dependencies:
+      '@modelcontextprotocol/core': 2.0.0
+      content-type: 1.0.5
+      cors: 2.8.5
+      express-rate-limit: 8.2.2(express@5.1.0)
+      pkce-challenge: 5.0.0(patch_hash=651e785d0b7bbf5be9210e1e895c39a16dc3ce8a5a3843b4819565fb6e175b90)
+      raw-body: 3.0.0
+      zod: 3.25.76
+    optionalDependencies:
+      express: 5.1.0
+
   '@modelcontextprotocol/server@2.0.0':
     dependencies:
       '@modelcontextprotocol/core': 2.0.0
diff --git a/pnpm-workspace.yaml b/pnpm-workspace.yaml
index 40644113698..f4f679fc94f 100644
--- a/pnpm-workspace.yaml
+++ b/pnpm-workspace.yaml
@@ -58,6 +58,7 @@ catalog:
   '@modelcontextprotocol/node': 2.0.0
   '@modelcontextprotocol/sdk': 1.26.0
   '@modelcontextprotocol/server': 2.0.0
+  '@modelcontextprotocol/server-legacy': 2.0.0
   '@mozilla/readability': ^0.6.0
   '@n8n_io/ai-assistant-sdk': 1.25.0
   '@openrouter/ai-sdk-provider': ^3.0.0