fix if var exits for incr

server/src/tools/checks.py

@@ -144,16 +144,25 @@ class UndeclaredVariableCheck(Visitor):
 
         # Second pass: flag VarSub usages that are not accounted for
         def _scan(node):
+            # 1) Variable substitutions like $var
             if isinstance(node, VarSub):
                 var_name = node.value or ""
-                # Strip leading namespace separator for comparison; treat only leading :: as global
                 if var_name.startswith("::"):
                     return
                 base = var_name
-                # VarSub.value does not include index; indices are separate children
                 if base not in locals_set and base not in declared_globals:
                     msg = f"Variable '{base}' used in proc is not set locally and not declared global; use 'global {base}' or '$::{base}'"
                     self._violations.append(Violation(Rules.UNDECLARED_VARIABLE, msg, node.pos, node.end_pos))
+            # 2) Commands that take a variable name as first argument, e.g., 'incr var [amount]'
+            elif isinstance(node, Command) and hasattr(node.routine, "contents"):
+                if node.routine.contents == "incr" and node.args:
+                    first_arg = node.args[0]
+                    text = _word_text(first_arg) or ""
+                    base = text.split("(", 1)[0]
+                    if base and not base.startswith("::"):
+                        if base not in locals_set and base not in declared_globals:
+                            msg = f"Variable '{base}' used in proc is not set locally and not declared global; use 'global {base}'"
+                            self._violations.append(Violation(Rules.UNDECLARED_VARIABLE, msg, first_arg.pos, first_arg.end_pos))
             for ch in getattr(node, "children", []):
                 _scan(ch)