🔧 Major HTTP Transport Protocol Fix & UX Improvements

crates/mcp-cli/src/commands/debug.rs

@@ -179,7 +179,11 @@ impl DebugCommand {
                 }
             }
             Err(e) => {
-                println!("❌ Failed to list resources: {}", e);
+                if e.to_string().contains("Method not found") {
+                    println!("📁 Resources (0):");
+                } else {
+                    println!("❌ Failed to list resources: {}", e);
+                }
             }
         }
 
@@ -191,7 +195,11 @@ impl DebugCommand {
                 }
             }
             Err(e) => {
-                println!("❌ Failed to list prompts: {}", e);
+                if e.to_string().contains("Method not found") {
+                    println!("💬 Prompts (0):");
+                } else {
+                    println!("❌ Failed to list prompts: {}", e);
+                }
             }
         }
 

crates/mcp-cli/src/main.rs

@@ -4,6 +4,8 @@
 //! allowing developers to test and validate their MCP implementations before
 //! deploying to production LLM hosts.
 
+#![allow(clippy::uninlined_format_args)]
+
 use anyhow::Result;
 use clap::Parser;
 use tracing_subscriber::{layer::SubscriberExt, util::SubscriberInitExt};

crates/mcp-core/src/client.rs

@@ -317,7 +317,7 @@ impl McpClient {
 
         // Connect transport
         self.transport.connect().await.map_err(|e| {
-            let error = format!("Transport connection failed: {}", e);
+            let error = format!("Transport connection failed: {e}");
             self.set_error_state(error.clone());
             McpError::Protocol(ProtocolError::InitializationFailed { reason: error })
         })?;
@@ -405,7 +405,7 @@ impl McpClient {
 
     fn generate_request_id(&self) -> String {
         let counter = self.request_counter.fetch_add(1, Ordering::SeqCst);
-        format!("req_{}", counter)
+        format!("req_{counter}")
     }
 
     async fn start_message_processing(&mut self) -> McpResult<()> {

crates/mcp-core/src/lib.rs

@@ -65,6 +65,7 @@
 #![warn(missing_docs)]
 #![warn(clippy::all)]
 #![allow(clippy::module_name_repetitions)]
+#![allow(clippy::uninlined_format_args)]
 
 pub mod client;
 pub mod error;

crates/mcp-core/src/messages/core.rs

@@ -229,7 +229,7 @@ impl JsonRpcResponse {
     {
         match (&self.result, &self.error) {
             (Some(result), None) => Ok(serde_json::from_value(result.clone())?),
-            (None, Some(error)) => Err(format!("JSON-RPC error: {}", error).into()),
+            (None, Some(error)) => Err(format!("JSON-RPC error: {error}").into()),
             _ => Err("Invalid response: both result and error are present or missing".into()),
         }
     }
@@ -436,7 +436,7 @@ impl std::fmt::Display for JsonRpcError {
     fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
         write!(f, "JSON-RPC Error {}: {}", self.code, self.message)?;
         if let Some(data) = &self.data {
-            write!(f, " ({})", data)?;
+            write!(f, " ({data})")?;
         }
         Ok(())
     }
@@ -486,8 +486,8 @@ impl From<i32> for RequestId {
 impl std::fmt::Display for RequestId {
     fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
         match self {
-            Self::String(s) => write!(f, "{}", s),
-            Self::Number(n) => write!(f, "{}", n),
+            Self::String(s) => write!(f, "{s}"),
+            Self::Number(n) => write!(f, "{n}"),
             Self::Null => write!(f, "null"),
         }
     }

crates/mcp-core/src/messages/logging.rs

@@ -335,7 +335,7 @@ mod tests {
 
         for (level, expected) in levels.iter().zip(expected.iter()) {
             let json = serde_json::to_string(level).unwrap();
-            assert_eq!(json, format!("\"{}\"", expected));
+            assert_eq!(json, format!("\"{expected}\""));
             assert_eq!(level.to_string(), *expected);
         }
     }