diff --git a/.github/workflows/main.yml b/.github/workflows/main.yml
index bbf844af..efced516 100644
--- a/.github/workflows/main.yml
+++ b/.github/workflows/main.yml
@@ -21,8 +21,6 @@ jobs:
     runs-on: ubuntu-24.04
     steps:
       - uses: actions/checkout@8e8c483db84b4bee98b60c0593521ed34d9990e8 # v6.0.1
-        with:
-          ref: ${{ github.head_ref }} # get current branch name
       - uses: actions/setup-python@83679a892e2d95755f2dac6acb0bfd1e9ac5d548 # v6.1.0
         with:
           python-version: '3.x'
@@ -89,8 +87,6 @@ jobs:
       runs-on: ubuntu-24.04
       steps:
         - uses: actions/checkout@v6.0.1
-          with:
-            ref: ${{ github.head_ref }} # get current branch name
         - uses: actions/setup-python@v6.1.0
           with:
             python-version: "3.10"
diff --git a/commit_check/engine.py b/commit_check/engine.py
index 4a76e0e7..aaf1ea60 100644
--- a/commit_check/engine.py
+++ b/commit_check/engine.py
@@ -522,7 +522,7 @@ class ValidationEngine:
     VALIDATOR_MAP: Dict[str, Type[BaseValidator]] = {
         "message": CommitMessageValidator,
         "subject_capitalized": SubjectCapitalizationValidator,
-        "imperative": SubjectImperativeValidator,
+        "subject_imperative": SubjectImperativeValidator,
         "subject_max_length": SubjectLengthValidator,
         "subject_min_length": SubjectLengthValidator,
         "author_name": AuthorValidator,
diff --git a/commit_check/main.py b/commit_check/main.py
index c473a3ad..d1e46738 100644
--- a/commit_check/main.py
+++ b/commit_check/main.py
@@ -151,7 +151,7 @@ def main() -> int:
             requested_checks.extend(
                 [
                     "message",
-                    "imperative",
+                    "subject_imperative",
                     "subject_max_length",
                     "subject_min_length",
                     "require_signed_off_by",
diff --git a/commit_check/rules_catalog.py b/commit_check/rules_catalog.py
index d48d366a..e291915a 100644
--- a/commit_check/rules_catalog.py
+++ b/commit_check/rules_catalog.py
@@ -27,7 +27,7 @@ class RuleCatalogEntry:
         suggest="Capitalize the first word of the subject",
     ),
     RuleCatalogEntry(
-        check="imperative",
+        check="subject_imperative",
         regex=None,
         error="Commit message should use imperative mood (e.g., 'Add feature' not 'Added feature')",
         suggest="Use imperative mood in the subject line",
diff --git a/tests/engine_comprehensive_test.py b/tests/engine_comprehensive_test.py
index 8ce16da3..b01a8951 100644
--- a/tests/engine_comprehensive_test.py
+++ b/tests/engine_comprehensive_test.py
@@ -157,7 +157,7 @@ class TestSubjectImperativeValidator:
     def test_subject_imperative_pass(self):
         """Test SubjectImperativeValidator pass case."""
         rule = ValidationRule(
-            check="imperative",
+            check="subject_imperative",
             regex="",
             error="Subject must be imperative",
             suggest="Use imperative mood",
@@ -173,7 +173,7 @@ def test_subject_imperative_pass(self):
     def test_subject_imperative_fail(self):
         """Test SubjectImperativeValidator fail case."""
         rule = ValidationRule(
-            check="imperative",
+            check="subject_imperative",
             regex="",
             error="Subject must be imperative",
             suggest="Use imperative mood",
@@ -247,7 +247,7 @@ def test_validation_engine_validator_map(self):
         expected_mappings = {
             "message": CommitMessageValidator,
             "subject_capitalized": SubjectCapitalizationValidator,
-            "imperative": SubjectImperativeValidator,
+            "subject_imperative": SubjectImperativeValidator,
             "subject_max_length": SubjectLengthValidator,
             "subject_min_length": SubjectLengthValidator,
             "author_name": AuthorValidator,
diff --git a/tests/engine_test.py b/tests/engine_test.py
index 81e714c6..416b5785 100644
--- a/tests/engine_test.py
+++ b/tests/engine_test.py
@@ -870,7 +870,7 @@ class TestSubjectImperativeValidator:
     @pytest.mark.benchmark
     def test_validate_with_imperative_subject(self):
         """Test validation with proper imperative subject."""
-        rule = ValidationRule(check="imperative")
+        rule = ValidationRule(check="subject_imperative")
         validator = SubjectImperativeValidator(rule)
         context = ValidationContext(stdin_text="fix: resolve the issue")
 
@@ -880,7 +880,7 @@ def test_validate_with_imperative_subject(self):
     @pytest.mark.benchmark
     def test_validate_with_non_imperative_subject(self):
         """Test validation with non-imperative subject."""
-        rule = ValidationRule(check="imperative")
+        rule = ValidationRule(check="subject_imperative")
         validator = SubjectImperativeValidator(rule)
         context = ValidationContext(stdin_text="fix: resolved the issue")
 
@@ -892,7 +892,7 @@ def test_validate_with_non_imperative_subject(self):
     @pytest.mark.benchmark
     def test_validate_short_subject(self):
         """Test validation with very short subject (edge case)."""
-        rule = ValidationRule(check="imperative")
+        rule = ValidationRule(check="subject_imperative")
         validator = SubjectImperativeValidator(rule)
         context = ValidationContext(stdin_text="feat: add")
 
@@ -903,7 +903,7 @@ def test_validate_short_subject(self):
     @pytest.mark.benchmark
     def test_validate_with_breaking_change(self):
         """Test validation with breaking change notation."""
-        rule = ValidationRule(check="imperative")
+        rule = ValidationRule(check="subject_imperative")
         validator = SubjectImperativeValidator(rule)
         context = ValidationContext(stdin_text="feat!: update authentication system")
 
@@ -914,7 +914,7 @@ def test_validate_with_breaking_change(self):
     @pytest.mark.benchmark
     def test_validate_with_scoped_breaking_change(self):
         """Test validation with scoped breaking change notation."""
-        rule = ValidationRule(check="imperative")
+        rule = ValidationRule(check="subject_imperative")
         validator = SubjectImperativeValidator(rule)
         context = ValidationContext(stdin_text="fix(auth)!: resolve login bug")