- Add @model_validator to ActionArgumentSchema that validates default value type matches declared type
- Support all argument types: string, integer, float, boolean, list
- Handle edge cases: None defaults (always valid), bool vs int disambiguation
- Add comprehensive BDD scenarios covering all type combinations and mismatch cases
- Error messages are clear and actionable, indicating expected vs actual types
- Fixes issue #9105: Missing validation for argument default value types

@@ -147,0 +178,4 @@
+                    f"Argument '{self.name}' has type 'integer' but default value "
+                    f"'{default_value}' is {type(default_value).__name__}, not int."
+                )
+        elif arg_type == "float":

@@ -0,0 +17,4 @@
+    And the action config should have 6 arguments with defaults
+    And action argument 0 name should be "str_arg" with default "hello"
+    And action argument 0 type should be "string"
+    And action argument 1 name should be "int_arg" with default "42"

@@ -0,0 +30,4 @@
+  @tdd_issue @tdd_issue_8322
+  Scenario: String default for integer argument fails validation
+    Given an action YAML with integer arg as string "forty-two"
+    When I validate the action schema expecting failure

@@ -0,0 +33,4 @@
+    When I validate the action schema expecting failure
+    Then the action schema validation should fail
+    And the error should mention 'my_arg'
+    And the actual type should be mentioned

@@ -459,0 +490,4 @@
+
+
+@then('the action config should have {count:d} arguments with defaults')
+def step_then_argument_defaults(context: Context, count: int) -> None:

@@ -459,0 +515,4 @@
+
+
+@then('action argument {idx:d} type should be "{expected}"')
+def step_then_argument_type(context: Context, idx: int, expected: str) -> None:

@@ -459,0 +611,4 @@
+# ── Steps for specific bad-default scenarios ───────────────────────────
+
+_BAD_INT_STRING_YAML = """\
+name: local/bad-int-str

@@ -144,1 +243,4 @@
+
+        return self
+
     model_config = ConfigDict(

@@ -0,0 +1,279 @@
+"""Unit tests for ActionArgumentSchema default value type validation.

@@ -0,0 +27,4 @@
+  # Invalid default: string where integer expected
+  # ---------------------------------------------------------------------------
+
+  @tdd_issue @tdd_issue_8322

@@ -0,0 +33,4 @@
+    When I validate the action schema expecting failure
+    Then the action schema validation should fail
+    And the error should mention 'my_arg'
+    And the actual type should be mentioned

@@ -0,0 +140,4 @@
+
+  @tdd_issue @tdd_issue_8322
+  Scenario: Boolean default for integer argument is rejected (bool is subclass of int)
+    Given an action YAML string with argument named "count" as {type_} type and boolean default true

@@ -459,0 +490,4 @@
+
+
+@then('the action config should have {count:d} arguments with defaults')
+def step_then_argument_defaults(context: Context, count: int) -> None:

@@ -459,0 +507,4 @@
+    arg = context.action_config.arguments[idx]
+    assert arg.name == expected
+    if default_value.lower() == "true":
+        assert arg.default is True

@@ -459,0 +514,4 @@
+        assert arg.default == default_value
+
+
+@then('action argument {idx:d} type should be "{expected}"')

@@ -459,0 +603,4 @@
+
+
+@given('an action YAML string:')
+def step_given_yaml_multiline(context: Context, yaml_content: str) -> None:

@@ -0,0 +1,279 @@
+"""Unit tests for ActionArgumentSchema default value type validation.

@@ -459,0 +550,4 @@
+    ), f"Expected a declared type name in error, got: {context.action_schema_error}"
+
+
+@then("the action schema error should mention {match_text}")