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startup messages to stderr. (reserve stdio for JSON-RPC MCP messages) #1

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Merged
kurtisvg merged 1 commit into from
Apr 2, 2026
Merged

startup messages to stderr. (reserve stdio for JSON-RPC MCP messages) #1

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8 changes: 4 additions & 4 deletions cmd/root.go
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Original file line number Diff line number Diff line change
Expand Up @@ -38,14 +38,14 @@ func Execute() {
log.Fatalf("Invalid config: %v", err)
}

fmt.Printf("Loaded %d server(s):\n", len(cfg.MCPServers))
fmt.Fprintf(os.Stderr, "Loaded %d server(s):\n", len(cfg.MCPServers))
for name, srv := range cfg.MCPServers {
tt, _ := srv.TransportType() // already validated
switch tt {
case config.TransportSTDIO:
fmt.Printf(" [%s] %s → %s %v\n", name, tt, srv.Command, srv.Args)
fmt.Fprintf(os.Stderr, " [%s] %s → %s %v\n", name, tt, srv.Command, srv.Args)
case config.TransportHTTP, config.TransportSSE:
fmt.Printf(" [%s] %s → %s\n", name, tt, srv.URL)
fmt.Fprintf(os.Stderr, " [%s] %s → %s\n", name, tt, srv.URL)
}
}

Expand All @@ -58,7 +58,7 @@ func Execute() {
}
defer mgr.Close()

fmt.Printf("Connected to %d skill(s): %v\n", len(mgr.ListServerNames()), mgr.ListServerNames())
fmt.Fprintf(os.Stderr, "Connected to %d skill(s): %v\n", len(mgr.ListServerNames()), mgr.ListServerNames())

s := server.NewServer(mgr)
if err := server.Serve(ctx, s, transport, host, port); err != nil {
Expand Down
3 changes: 2 additions & 1 deletion internal/server/server.go
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Original file line number Diff line number Diff line change
Expand Up @@ -5,6 +5,7 @@ import (
"fmt"
"net"
"net/http"
"os"

"github.com/modelcontextprotocol/go-sdk/mcp"
"skillful-mcp/internal/clientmanager"
Expand Down Expand Up @@ -39,7 +40,7 @@ func Serve(ctx context.Context, s *mcp.Server, transport, host, port string) err
<-ctx.Done()
srv.Close()
}()
fmt.Printf("Listening on %s\n", addr)
fmt.Fprintf(os.Stderr, "Listening on %s\n", addr)
if err := srv.ListenAndServe(); err != http.ErrServerClosed {
return err
}
Expand Down