toolsrv: fire OnToolsChanged after LoadTool

The system prompt tool listing now refreshes immediately on tool_load
instead of only on file-watcher events. buildToolListing helper added
to format the listing in the same format BuildPreamble uses.

Also updates kde submodule: GUI auto-switches to newly created agent,
removes remote field from agent dialog.

kde

@@ -1 +1 @@
-Subproject commit 70390097b01e5a3d7ae6f55d84673bb0dc84fb01
+Subproject commit e24d332d50fdeac0703bf93b39c04513fd158bd7

toolsrv/accessors.go

@@ -2,6 +2,8 @@ package toolsrv
 
 import (
 	"context"
+	"fmt"
+	"strings"
 )
 
 // --- Exported accessors for builtin tool handlers ---
@@ -40,3 +42,16 @@ func (e *Server) ExecuteInSandbox(ctx context.Context, cmd, language string, tim
 func (e *Server) ExecuteElevated(ctx context.Context, cmd, dir string, timeout int, detach bool) (string, error) {
 	return e.executeElevated(ctx, cmd, dir, timeout, detach)
 }
+
+// buildToolListing formats a slice of ToolInfo into the preamble listing
+// format consumed by agent.refreshToolListing: "- **name** — description\n" per entry.
+// Only local tools (Server == "") with a non-empty description are included.
+func buildToolListing(infos []ToolInfo) string {
+	var sb strings.Builder
+	for _, ti := range infos {
+		if ti.Description != "" && ti.Server == "" {
+			fmt.Fprintf(&sb, "- **%s** — %s\n", ti.Name, ti.Description)
+		}
+	}
+	return sb.String()
+}

toolsrv/server.go

@@ -127,6 +127,8 @@ func WithToolRegistry(r *Registry, sessionID string) Option {
 
 // LoadTool loads a tool by name into this server's tool registry.
 // Returns an error if no registry is configured or the tool cannot be found.
+// If OnToolsChanged is set, it is called with the updated tool listing so the
+// system prompt reflects the newly available tool immediately.
 func (e *Server) LoadTool(name string) error {
 	if e.toolRegistry == nil {
 		return fmt.Errorf("no tool registry configured")
@@ -134,7 +136,14 @@ func (e *Server) LoadTool(name string) error {
 	if e.sessionID == "" {
 		return fmt.Errorf("no session ID configured")
 	}
-	return e.toolRegistry.Load(e.sessionID, name)
+	if err := e.toolRegistry.Load(e.sessionID, name); err != nil {
+		return err
+	}
+	if e.OnToolsChanged != nil {
+		listing := buildToolListing(e.toolRegistry.Loaded(e.sessionID))
+		e.OnToolsChanged(listing)
+	}
+	return nil
 }