diff --git a/CHANGELOG.md b/CHANGELOG.md
index 3002e1d7..d7a83435 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -23,6 +23,10 @@ Configs that still reference the legacy types now fail to load with an actionabl
 
 ## [Unreleased]
 
+### Fixed
+
+- `wfctl validate --plugin-dir` now registers plugin `resourceTypes` from both flat manifests and `capabilities.iacProvider.resourceTypes`, so plugin-backed `infra.*` resource modules validate the same way `wfctl infra plan/apply` consume them.
+
 ### Breaking changes (workflow#699 — IaCProvider.Apply hard-removal)
 
 - `interfaces.IaCProvider.Apply` removed. Plugins must implement v2 dispatch (declare `CapabilitiesResponse.compute_plan_version="v2"` via the typed RPC) and drop their `Apply` Go method.
diff --git a/schema/schema.go b/schema/schema.go
index 436739eb..e0a6acfe 100644
--- a/schema/schema.go
+++ b/schema/schema.go
@@ -517,6 +517,7 @@ type pluginManifestTypes struct {
 	StepTypes     []string `json:"stepTypes"`
 	TriggerTypes  []string `json:"triggerTypes"`
 	WorkflowTypes []string `json:"workflowTypes"`
+	ResourceTypes []string `json:"resourceTypes"`
 	// Capabilities is stored as raw JSON to safely handle both the registry-manifest
 	// format (object with moduleTypes/stepTypes/etc.) and the engine-internal format
 	// (array of CapabilityDecl). A non-object value is silently ignored.
@@ -531,6 +532,10 @@ type pluginManifestCapabilities struct {
 	StepTypes        []string `json:"stepTypes"`
 	TriggerTypes     []string `json:"triggerTypes"`
 	WorkflowHandlers []string `json:"workflowHandlers"`
+	ResourceTypes    []string `json:"resourceTypes"`
+	IaCProvider      *struct {
+		ResourceTypes []string `json:"resourceTypes"`
+	} `json:"iacProvider"`
 }
 
 // LoadPluginTypesFromDir scans pluginDir for subdirectories containing a
@@ -563,6 +568,9 @@ func LoadPluginTypesFromDir(pluginDir string) error {
 			// Step types share the module type registry (identified by "step." prefix).
 			RegisterModuleType(t)
 		}
+		for _, t := range m.ResourceTypes {
+			RegisterModuleType(t)
+		}
 		for _, t := range m.TriggerTypes {
 			RegisterTriggerType(t)
 		}
@@ -581,6 +589,14 @@ func LoadPluginTypesFromDir(pluginDir string) error {
 				for _, t := range cap.StepTypes {
 					RegisterModuleType(t)
 				}
+				for _, t := range cap.ResourceTypes {
+					RegisterModuleType(t)
+				}
+				if cap.IaCProvider != nil {
+					for _, t := range cap.IaCProvider.ResourceTypes {
+						RegisterModuleType(t)
+					}
+				}
 				for _, t := range cap.TriggerTypes {
 					RegisterTriggerType(t)
 				}
diff --git a/schema/schema_test.go b/schema/schema_test.go
index 56be2ef5..9297f7c0 100644
--- a/schema/schema_test.go
+++ b/schema/schema_test.go
@@ -887,10 +887,12 @@ func TestLoadPluginTypesFromDir_RegistersTypes(t *testing.T) {
 	const customModuleType = "external.plugin.module.testonly"
 	const customTriggerType = "external.trigger.testonly"
 	const customWorkflowType = "external.workflow.testonly"
+	const customResourceType = "infra.plugin_resource_testonly"
 
 	// Cleanup after test
 	t.Cleanup(func() {
 		UnregisterModuleType(customModuleType)
+		UnregisterModuleType(customResourceType)
 		UnregisterTriggerType(customTriggerType)
 		UnregisterWorkflowType(customWorkflowType)
 	})
@@ -903,6 +905,7 @@ func TestLoadPluginTypesFromDir_RegistersTypes(t *testing.T) {
 	}
 	manifest := `{
 		"moduleTypes": ["` + customModuleType + `"],
+		"resourceTypes": ["` + customResourceType + `"],
 		"stepTypes": [],
 		"triggerTypes": ["` + customTriggerType + `"],
 		"workflowTypes": ["` + customWorkflowType + `"]
@@ -919,6 +922,7 @@ func TestLoadPluginTypesFromDir_RegistersTypes(t *testing.T) {
 	cfg := &config.WorkflowConfig{
 		Modules: []config.ModuleConfig{
 			{Name: "ext", Type: customModuleType},
+			{Name: "res", Type: customResourceType},
 		},
 		Triggers: map[string]any{
 			customTriggerType: map[string]any{},
@@ -950,10 +954,14 @@ func TestLoadPluginTypesFromDir_CapabilitiesFormat(t *testing.T) {
 	const customModuleType = "external.caps.module.testonly"
 	const customStepType = "step.caps_step_testonly"
 	const customTriggerType = "external.caps.trigger.testonly"
+	const customResourceType = "infra.caps_resource_testonly"
+	const customIaCResourceType = "infra.caps_iac_resource_testonly"
 
 	t.Cleanup(func() {
 		UnregisterModuleType(customModuleType)
 		UnregisterModuleType(customStepType)
+		UnregisterModuleType(customResourceType)
+		UnregisterModuleType(customIaCResourceType)
 		UnregisterTriggerType(customTriggerType)
 	})
 
@@ -962,7 +970,7 @@ func TestLoadPluginTypesFromDir_CapabilitiesFormat(t *testing.T) {
 	if err := makeDir(pluginDir); err != nil {
 		t.Fatal(err)
 	}
-	manifest := `{"name":"caps-plugin","version":"1.0.0","type":"external","capabilities":{"configProvider":false,"moduleTypes":["` + customModuleType + `"],"stepTypes":["` + customStepType + `"],"triggerTypes":["` + customTriggerType + `"]}}`
+	manifest := `{"name":"caps-plugin","version":"1.0.0","type":"external","capabilities":{"configProvider":false,"moduleTypes":["` + customModuleType + `"],"stepTypes":["` + customStepType + `"],"triggerTypes":["` + customTriggerType + `"],"resourceTypes":["` + customResourceType + `"],"iacProvider":{"name":"test","resourceTypes":["` + customIaCResourceType + `"]}}}`
 	if err := writeFile(pluginDir+"/plugin.json", []byte(manifest)); err != nil {
 		t.Fatal(err)
 	}
@@ -975,6 +983,8 @@ func TestLoadPluginTypesFromDir_CapabilitiesFormat(t *testing.T) {
 	cfg := &config.WorkflowConfig{
 		Modules: []config.ModuleConfig{
 			{Name: "ext", Type: customModuleType},
+			{Name: "res", Type: customResourceType},
+			{Name: "iac-res", Type: customIaCResourceType},
 		},
 	}
 	if err := ValidateConfig(cfg, WithAllowNoEntryPoints()); err != nil {
@@ -988,6 +998,12 @@ func TestLoadPluginTypesFromDir_CapabilitiesFormat(t *testing.T) {
 	if !sliceContains(knownModules, customStepType) {
 		t.Errorf("expected %q in KnownModuleTypes (step), got: %v", customStepType, knownModules)
 	}
+	if !sliceContains(knownModules, customResourceType) {
+		t.Errorf("expected %q in KnownModuleTypes (resource), got: %v", customResourceType, knownModules)
+	}
+	if !sliceContains(knownModules, customIaCResourceType) {
+		t.Errorf("expected %q in KnownModuleTypes (iac provider resource), got: %v", customIaCResourceType, knownModules)
+	}
 	knownTriggers := KnownTriggerTypes()
 	if !sliceContains(knownTriggers, customTriggerType) {
 		t.Errorf("expected %q in KnownTriggerTypes, got: %v", customTriggerType, knownTriggers)