From 31c18fba2da33d116a9a546b6d02b19d0ff1d089 Mon Sep 17 00:00:00 2001
From: winterfx <136159170+winterfx@users.noreply.github.com>
Date: Wed, 6 Aug 2025 00:05:51 +0800
Subject: [PATCH] docs: fix middleware example function signature (#236)

- Correct MethodHandler type parameter to use fully qualified
mcp.ServerSession
- Update parameter types to use proper mcp.Params and mcp.Result instead
of any
- Ensure example code matches the actual API
---
 design/design.md | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/design/design.md b/design/design.md
index 33dc3a6..93dc552 100644
--- a/design/design.md
+++ b/design/design.md
@@ -456,8 +456,8 @@ func (s *Server) AddReceivingMiddleware(middleware ...Middleware[*ServerSession]
 As an example, this code adds server-side logging:
 
 ```go
-func withLogging(h mcp.MethodHandler[*ServerSession]) mcp.MethodHandler[*ServerSession]{
-    return func(ctx context.Context, s *mcp.ServerSession, method string, params any) (res any, err error) {
+func withLogging(h mcp.MethodHandler[*mcp.ServerSession]) mcp.MethodHandler[*mcp.ServerSession]{
+    return func(ctx context.Context, s *mcp.ServerSession, method string, params mcp.Params) (res mcp.Result, err error) {
         log.Printf("request: %s %v", method, params)
         defer func() { log.Printf("response: %v, %v", res, err) }()
         return h(ctx, s , method, params)