diff --git a/cmd/wfctl/modernize_test.go b/cmd/wfctl/modernize_test.go
index 7c5be023..dbe2f482 100644
--- a/cmd/wfctl/modernize_test.go
+++ b/cmd/wfctl/modernize_test.go
@@ -485,6 +485,62 @@ modules:
 	}
 }
 
+func TestCamelCaseConfigCheck_SchemaDefinedKeysNotFlagged(t *testing.T) {
+	// openapi module uses snake_case keys (spec_file, register_routes, swagger_ui,
+	// max_body_bytes) defined in its own schema — these must NOT be flagged.
+	input := `
+modules:
+  - name: api-docs
+    type: openapi
+    config:
+      spec_file: ./specs/api.yaml
+      register_routes: false
+      swagger_ui:
+        enabled: true
+        path: /docs
+      max_body_bytes: 1048576
+`
+	rule := findRule("camelcase-config")
+	if rule == nil {
+		t.Fatal("camelcase-config rule not found")
+	}
+	doc := parseTestYAML(t, input)
+	findings := rule.Check(doc, []byte(input))
+	if len(findings) != 0 {
+		t.Errorf("expected no findings for schema-defined snake_case keys, got %d: %v", len(findings), findings)
+	}
+}
+
+func TestCamelCaseConfigCheck_UnknownModuleTypeStillFlagged(t *testing.T) {
+	// For a module type not in the schema registry, snake_case keys should still be flagged.
+	input := `
+modules:
+  - name: my-thing
+    type: custom.unknown
+    config:
+      snake_key: value
+`
+	rule := findRule("camelcase-config")
+	if rule == nil {
+		t.Fatal("camelcase-config rule not found")
+	}
+	doc := parseTestYAML(t, input)
+	findings := rule.Check(doc, []byte(input))
+	if len(findings) == 0 {
+		t.Fatal("expected findings for snake_case config keys on unknown module type")
+	}
+	found := false
+	for _, f := range findings {
+		if strings.Contains(f.Message, `"snake_key"`) {
+			found = true
+			break
+		}
+	}
+	if !found {
+		t.Errorf("expected a finding mentioning key \"snake_key\", got: %v", findings)
+	}
+}
+
 func TestModernizeAllRulesRegistered(t *testing.T) {
 	rules := modernize.AllRules()
 	expectedIDs := []string{
diff --git a/modernize/rules.go b/modernize/rules.go
index 174bb135..4ce443b6 100644
--- a/modernize/rules.go
+++ b/modernize/rules.go
@@ -5,6 +5,7 @@ import (
 	"regexp"
 	"strings"
 
+	"github.com/GoCodeAlone/workflow/schema"
 	"gopkg.in/yaml.v3"
 )
 
@@ -625,6 +626,28 @@ func requestParseConfigRule() Rule {
 var snakeCaseKeyRegex = regexp.MustCompile(`^[a-z]+(_[a-z0-9]+)+$`)
 
 func camelCaseConfigRule() Rule {
+	// Build a registry of schema-defined config key names per module type so
+	// that keys which are intentionally snake_case (e.g. openapi's spec_file,
+	// register_routes, swagger_ui) are never flagged as anti-patterns.
+	schemaRegistry := schema.NewModuleSchemaRegistry()
+
+	// Cache the schema key sets by module type to avoid rebuilding them for
+	// every module instance encountered during a Check run.
+	schemaKeyCache := make(map[string]map[string]bool)
+	schemaKeysFor := func(moduleType string) map[string]bool {
+		if cached, ok := schemaKeyCache[moduleType]; ok {
+			return cached
+		}
+		keys := make(map[string]bool)
+		if ms := schemaRegistry.Get(moduleType); ms != nil {
+			for i := range ms.ConfigFields {
+				keys[ms.ConfigFields[i].Key] = true
+			}
+		}
+		schemaKeyCache[moduleType] = keys
+		return keys
+	}
+
 	return Rule{
 		ID:          "camelcase-config",
 		Description: "Detect snake_case config field names (engine requires camelCase)",
@@ -641,9 +664,18 @@ func camelCaseConfigRule() Rule {
 				if nameNode != nil {
 					modName = nameNode.Value
 				}
+
+				// Resolve the set of officially defined config keys for this module
+				// type so that schema-declared snake_case keys are not flagged.
+				var schemaKeys map[string]bool
+				typeNode := findMapValue(mod, "type")
+				if typeNode != nil && typeNode.Value != "" {
+					schemaKeys = schemaKeysFor(typeNode.Value)
+				}
+
 				for i := 0; i+1 < len(cfg.Content); i += 2 {
 					key := cfg.Content[i]
-					if key.Kind == yaml.ScalarNode && snakeCaseKeyRegex.MatchString(key.Value) {
+					if key.Kind == yaml.ScalarNode && snakeCaseKeyRegex.MatchString(key.Value) && !schemaKeys[key.Value] {
 						findings = append(findings, Finding{
 							RuleID:  "camelcase-config",
 							Line:    key.Line,