Unify model changes and shell command argument handling

internal/agents/bash.go

@@ -21,6 +21,20 @@ type bashArgs struct {
 	TimeoutMs *int   `json:"timeout_ms"`
 }
 
+func (a bashArgs) timeout() (time.Duration, error) {
+	if strings.TrimSpace(a.Command) == "" {
+		return 0, errors.New("command is empty")
+	}
+	timeout := defaultBashTimeout
+	if a.TimeoutMs != nil {
+		timeout = time.Duration(*a.TimeoutMs) * time.Millisecond
+	}
+	if timeout <= 0 || timeout > maxBashTimeout {
+		return 0, fmt.Errorf("timeout_ms must be between 1 and %d", maxBashTimeout.Milliseconds())
+	}
+	return timeout, nil
+}
+
 func (m *Manager) bashTool(l *live) mcp.Tool {
 	return mcp.Tool{
 		Name: "bash",
@@ -47,15 +61,9 @@ func (m *Manager) bash(ctx context.Context, l *live, raw json.RawMessage) (strin
 	if err != nil {
 		return "", fmt.Errorf("malformed bash call: %w", err)
 	}
-	if strings.TrimSpace(args.Command) == "" {
-		return "", errors.New("command is empty")
-	}
-	timeout := defaultBashTimeout
-	if args.TimeoutMs != nil {
-		timeout = time.Duration(*args.TimeoutMs) * time.Millisecond
-	}
-	if timeout <= 0 || timeout > maxBashTimeout {
-		return "", fmt.Errorf("timeout_ms must be between 1 and %d", maxBashTimeout.Milliseconds())
+	timeout, err := args.timeout()
+	if err != nil {
+		return "", err
 	}
 	task, err := m.store.GetTask(ctx, l.taskID)
 	if err != nil {