feat(mcphost): optimize shutdown logging to avoid false error messages

- Add identification for normal shutdown pipe errors in startStdioLog
- Optimize stdio log error handling logic to distinguish between normal shutdown and actual errors
- Add proper handling for SIGTERM (exit status 143) in isSignalError function
- Add debug logging for MCP config loading process
- Ensure clean shutdown without confusing error messages

internal/version/VERSION

@@ -1 +1 @@
-v5.0.0-beta-2506021152
+v5.0.0-beta-2506031321

mcphost/config.go

@@ -5,6 +5,8 @@ import (
 	"fmt"
 	"os"
 	"path/filepath"
+
+	"github.com/rs/zerolog/log"
 )
 
 const (
@@ -93,6 +95,7 @@ func (w ServerConfigWrapper) MarshalJSON() ([]byte, error) {
 
 // LoadMCPConfig loads the MCP configuration from the specified path or default location
 func LoadMCPConfig(configPath string) (*MCPConfig, error) {
+	log.Debug().Str("configPath", configPath).Msg("Loading MCP config")
 	if configPath == "" {
 		homeDir, err := os.UserHomeDir()
 		if err != nil {
@@ -122,6 +125,7 @@ func LoadMCPConfig(configPath string) (*MCPConfig, error) {
 		return nil, fmt.Errorf("error parsing config file: %w", err)
 	}
 	config.ConfigPath = configPath
-
+	log.Debug().Str("configPath", configPath).
+		Interface("config", config).Msg("Loaded MCP config")
 	return &config, nil
 }

mcphost/host.go

@@ -228,6 +228,7 @@ func isSignalError(err error) bool {
 		strings.Contains(errStr, "signal: terminated") ||
 		strings.Contains(errStr, "exit status 120") ||
 		strings.Contains(errStr, "exit status 130") ||
+		strings.Contains(errStr, "exit status 143") || // SIGTERM (15)
 		strings.Contains(errStr, "broken pipe") ||
 		strings.Contains(errStr, "connection reset")
 }
@@ -472,7 +473,12 @@ func startStdioLog(stderr io.Reader, serverName string, ctx context.Context) {
 				} else {
 					// Scanner finished or encountered error
 					if err := scanner.Err(); err != nil {
-						log.Debug().Str("server", serverName).Err(err).Msg("stdio log scanner error")
+						// Check if it's a normal shutdown error (pipe closed)
+						if isNormalShutdownError(err) {
+							log.Debug().Str("server", serverName).Msg("stdio log stopped due to normal shutdown")
+						} else {
+							log.Debug().Str("server", serverName).Err(err).Msg("stdio log scanner error")
+						}
 					}
 					return
 				}
@@ -481,6 +487,16 @@ func startStdioLog(stderr io.Reader, serverName string, ctx context.Context) {
 	}()
 }
 
+// isNormalShutdownError checks if the error is caused by normal shutdown (pipe closed)
+func isNormalShutdownError(err error) bool {
+	errStr := err.Error()
+	// Common pipe closed error patterns during normal shutdown
+	return strings.Contains(errStr, "file already closed") ||
+		strings.Contains(errStr, "broken pipe") ||
+		strings.Contains(errStr, "use of closed file") ||
+		strings.Contains(errStr, "read/write on closed pipe")
+}
+
 // prepareClientInitRequest creates a standard initialization request
 func prepareClientInitRequest() mcp.InitializeRequest {
 	return mcp.InitializeRequest{