diff --git a/ast_checker/checker.py b/ast_checker/checker.py
new file mode 100644
index 0000000..3d8db9c
--- /dev/null
+++ b/ast_checker/checker.py
@@ -0,0 +1,31 @@
+from tree_sitter import Parser
+
+from .engines import get_engine
+from .mappings import get_language, get_mapping
+
+
+def check_ast(code: str, language: str, rules: list[dict]) -> tuple[bool, list[str]]:
+    if not rules:
+        return True, []
+
+    ts_language = get_language(language)
+    if ts_language is None:
+        return True, []
+
+    mapping = get_mapping(language)
+
+    try:
+        parser = Parser(ts_language)
+        tree = parser.parse(code.encode("utf-8"))
+    except Exception:
+        return True, []
+
+    errors = []
+    for rule in rules:
+        engine = get_engine(rule.get("engine", ""))
+        if engine is None:
+            continue
+        rule_errors = engine.check(tree, rule, language, mapping)
+        errors.extend(rule_errors)
+
+    return len(errors) == 0, errors