add built-in tool_list and tool_load tools

pkg/tools/execute/code.go

@@ -43,7 +43,7 @@ var languagePatterns = map[string][]*regexp.Regexp{
 	"":     bashPatterns,
 }
 
-// Dispatch routes a shell tool call.
+// Dispatch routes tool calls to the appropriate handler.
 func (e *Server) Dispatch(ctx context.Context, name string, args json.RawMessage) (string, error) {
 	if e.OnPreDispatch != nil {
 		e.OnPreDispatch()
@@ -52,6 +52,10 @@ func (e *Server) Dispatch(ctx context.Context, name string, args json.RawMessage
 	switch name {
 	case "shell":
 		return dispatchShell(ctx, e, args)
+	case "tool_list":
+		return dispatchToolList(ctx, e, args)
+	case "tool_load":
+		return dispatchToolLoad(ctx, e, args)
 	default:
 		return "", fmt.Errorf("unknown execute tool: %s", name)
 	}
@@ -147,3 +151,44 @@ func dispatchShell(ctx context.Context, e *Server, args json.RawMessage) (string
 	}
 	return e.executeWithStdin(ctx, a.Cmd, "bash", timeout, sandboxName, false, "")
 }
+
+// dispatchToolList lists all available tools from the global registry.
+func dispatchToolList(ctx context.Context, e *Server, args json.RawMessage) (string, error) {
+	if e.toolRegistry == nil {
+		return "", fmt.Errorf("tool_list: no registry available")
+	}
+	summaries := e.toolRegistry.Summaries()
+	if len(summaries) == 0 {
+		return "(no tools found)", nil
+	}
+	var out strings.Builder
+	for _, s := range summaries {
+		out.WriteString(s.Name)
+		if s.Description != "" {
+			out.WriteString(" — ")
+			out.WriteString(s.Description)
+		}
+		out.WriteString("\n")
+	}
+	return strings.TrimRight(out.String(), "\n"), nil
+}
+
+// dispatchToolLoad loads a tool into the current session.
+func dispatchToolLoad(ctx context.Context, e *Server, args json.RawMessage) (string, error) {
+	var a struct {
+		Name string `json:"name"`
+	}
+	if err := json.Unmarshal(args, &a); err != nil {
+		return "", fmt.Errorf("tool_load: bad args: %w", err)
+	}
+	if a.Name == "" {
+		return "", fmt.Errorf("tool_load: name is required")
+	}
+	if e.toolRegistry == nil || e.sessionID == "" {
+		return "", fmt.Errorf("tool_load: no session registry")
+	}
+	if err := e.toolRegistry.Load(e.sessionID, a.Name); err != nil {
+		return "", fmt.Errorf("tool_load: %w", err)
+	}
+	return fmt.Sprintf("loaded: %s", a.Name), nil
+}

pkg/tools/execute/server.go

@@ -150,6 +150,32 @@ timeout applies to each call (default: 30s). A non-zero exit is an error.`,
 				}
 			}`),
 		},
+		{
+			Name: "tool_list",
+			Description: `List all available tools that can be loaded.
+
+Usage: {"name": "toolname"} — if name is provided, loads that tool.
+Otherwise lists all tools with descriptions.`,
+			InputSchema: json.RawMessage(`{
+				"type": "object",
+				"properties": {}
+			}`),
+		},
+		{
+			Name: "tool_load",
+			Description: `Load a tool by name into the current session.
+
+Usage: {"name": "toolname"}
+
+After loading, the tool becomes a native callable function.`,
+			InputSchema: json.RawMessage(`{
+				"type": "object",
+				"required": ["name"],
+				"properties": {
+					"name": {"type": "string", "description": "Tool name to load."}
+				}
+			}`),
+		},
 	}
 
 	if e.toolRegistry != nil && e.sessionID != "" {