diff --git a/docs/api/rule.md b/docs/api/rule.md
index 25a9fe13..5c3dfbed 100644
--- a/docs/api/rule.md
+++ b/docs/api/rule.md
@@ -215,7 +215,7 @@ Rule(async_function, run_sync(sync_function))
 from nonebot.rule import ArgumentParser
 
 parser = ArgumentParser()
-parser.add_argument("-a", type=bool)
+parser.add_argument("-a", action="store_true")
 
 rule = shell_command("ls", parser=parser)
 ```
diff --git a/nonebot/exception.py b/nonebot/exception.py
index b8a42aa4..7eaab701 100644
--- a/nonebot/exception.py
+++ b/nonebot/exception.py
@@ -53,6 +53,12 @@ class ParserExit(NoneBotException):
         self.status = status
         self.message = message
 
+    def __repr__(self):
+        return f"<ParserExit status={self.status} message={self.message}>"
+
+    def __str__(self):
+        return self.__repr__()
+
 
 class PausedException(NoneBotException):
     """
diff --git a/nonebot/rule.py b/nonebot/rule.py
index eb00de57..d9f75a24 100644
--- a/nonebot/rule.py
+++ b/nonebot/rule.py
@@ -326,7 +326,7 @@ def shell_command(*cmds: Union[str, Tuple[str, ...]],
         from nonebot.rule import ArgumentParser
 
         parser = ArgumentParser()
-        parser.add_argument("-a", type=bool)
+        parser.add_argument("-a", action="store_true")
 
         rule = shell_command("ls", parser=parser)
 
diff --git a/tests/test_plugins/test_shell.py b/tests/test_plugins/test_shell.py
index 5afebd6d..63719b42 100644
--- a/tests/test_plugins/test_shell.py
+++ b/tests/test_plugins/test_shell.py
@@ -4,7 +4,7 @@ from nonebot import on_shell_command
 from nonebot.rule import to_me, ArgumentParser
 
 parser = ArgumentParser()
-parser.add_argument("-a", type=bool)
+parser.add_argument("-a", action="store_true")
 
 shell = on_shell_command("ls", to_me(), parser=parser)