diff --git a/internal/watchsync/plugin_provider.go b/internal/watchsync/plugin_provider.go
index 234836a5..99cb5e84 100644
--- a/internal/watchsync/plugin_provider.go
+++ b/internal/watchsync/plugin_provider.go
@@ -8,6 +8,7 @@ import (
 	"fmt"
 	"net/url"
 	"regexp"
+	"strconv"
 	"strings"
 	"time"
 	"unicode"
@@ -774,17 +775,24 @@ func validateRequiredConnectionSchemaIsRenderable(schema *pluginv1.ConfigSchema)
 		}
 	}
 	for key, property := range document.Properties {
+		field := explicit[key]
 		switch property.Type {
 		case "string", watchSyncJSONSchemaNumberType, "integer", "boolean":
 			continue
 		case "array":
-			field := explicit[key]
 			if field != nil && field.GetControl() == pluginv1.AdminFormControl_ADMIN_FORM_CONTROL_MULTI_SELECT &&
 				(property.Items == nil || property.Items.Type == "string" || property.Items.Type == watchSyncJSONSchemaNumberType ||
 					property.Items.Type == "integer" || property.Items.Type == "boolean") {
 				continue
 			}
 		default:
+			// A property whose shape comes from enum/const/$ref cannot be
+			// inferred from type alone, but an explicit scalar form control is
+			// still a complete input mechanism. Direct object properties remain
+			// unsupported because none of these controls produces an object.
+			if property.Type != "object" && connectionAdminFieldRendersValue(field) {
+				continue
+			}
 		}
 		return fmt.Errorf(
 			"required connection config %q property %q needs a renderable admin_form field because type %q cannot be inferred",
@@ -796,6 +804,24 @@ func validateRequiredConnectionSchemaIsRenderable(schema *pluginv1.ConfigSchema)
 	return nil
 }
 
+func connectionAdminFieldRendersValue(field *pluginv1.AdminFormField) bool {
+	if field == nil {
+		return false
+	}
+	switch field.GetControl() {
+	case pluginv1.AdminFormControl_ADMIN_FORM_CONTROL_TEXT,
+		pluginv1.AdminFormControl_ADMIN_FORM_CONTROL_TEXTAREA,
+		pluginv1.AdminFormControl_ADMIN_FORM_CONTROL_PASSWORD,
+		pluginv1.AdminFormControl_ADMIN_FORM_CONTROL_NUMBER,
+		pluginv1.AdminFormControl_ADMIN_FORM_CONTROL_SWITCH,
+		pluginv1.AdminFormControl_ADMIN_FORM_CONTROL_SELECT,
+		pluginv1.AdminFormControl_ADMIN_FORM_CONTROL_MULTI_SELECT:
+		return true
+	default:
+		return false
+	}
+}
+
 func validateConnectionAdminFormValue(schema *pluginv1.ConfigSchema, value map[string]any) error {
 	if schema == nil || schema.GetAdminForm() == nil {
 		return nil
@@ -868,6 +894,9 @@ func connectionConfigNumber(value any) (float64, bool) {
 	case json.Number:
 		number, err := typed.Float64()
 		return number, err == nil
+	case string:
+		number, err := strconv.ParseFloat(strings.TrimSpace(typed), 64)
+		return number, err == nil
 	default:
 		return 0, false
 	}
diff --git a/internal/watchsync/plugin_provider_test.go b/internal/watchsync/plugin_provider_test.go
index 5f0484da..6983eb06 100644
--- a/internal/watchsync/plugin_provider_test.go
+++ b/internal/watchsync/plugin_provider_test.go
@@ -398,6 +398,9 @@ func TestPluginProviderRejectsRequiredConnectionConfigTheWebCannotRender(t *test
 		ConnectionConfigSchema: []*pluginv1.ConfigSchema{{
 			Key: "server", Required: true,
 			JsonSchema: `{"type":"object","properties":{"headers":{"type":"object"}}}`,
+			AdminForm: &pluginv1.AdminFormDescriptor{Fields: []*pluginv1.AdminFormField{{
+				Key: "headers", Control: pluginv1.AdminFormControl_ADMIN_FORM_CONTROL_TEXTAREA,
+			}}},
 		}},
 		ResolveClient: func(context.Context, int, string) (WatchSyncPluginClient, error) {
 			return &fakeWatchSyncPluginClient{}, nil
@@ -408,7 +411,7 @@ func TestPluginProviderRejectsRequiredConnectionConfigTheWebCannotRender(t *test
 	}
 }
 
-func TestPluginProviderAcceptsRequiredScalarFieldsMissingFromPartialAdminForm(t *testing.T) {
+func TestPluginProviderAcceptsRenderableRequiredConnectionConfig(t *testing.T) {
 	_, err := NewPluginProvider(PluginProviderOptions{
 		InstallationID: 4, ProviderKey: testPluginProviderKey, CapabilityID: testPluginCapabilityID,
 		Descriptor: &pluginv1.WatchSyncProviderDescriptor{AuthMethods: []pluginv1.WatchSyncAuthMethod{
@@ -430,6 +433,21 @@ func TestPluginProviderAcceptsRequiredScalarFieldsMissingFromPartialAdminForm(t
 					Options: []*pluginv1.AdminFormOption{{Value: "true", Label: "Enabled"}, {Value: "false", Label: "Disabled"}},
 				}}},
 			},
+			{
+				Key: "mode", Required: true,
+				JsonSchema: `{"type":"object","properties":{"value":{"enum":["standard","anime"]}}}`,
+				AdminForm: &pluginv1.AdminFormDescriptor{Fields: []*pluginv1.AdminFormField{{
+					Key: "value", Control: pluginv1.AdminFormControl_ADMIN_FORM_CONTROL_SELECT,
+					Options: []*pluginv1.AdminFormOption{{Value: "standard", Label: "Standard"}, {Value: "anime", Label: "Anime"}},
+				}}},
+			},
+			{
+				Key: "reference", Required: true,
+				JsonSchema: `{"type":"object","properties":{"endpoint":{"$ref":"#/$defs/endpoint"}},"$defs":{"endpoint":{"type":"string","format":"uri"}}}`,
+				AdminForm: &pluginv1.AdminFormDescriptor{Fields: []*pluginv1.AdminFormField{{
+					Key: "endpoint", Control: pluginv1.AdminFormControl_ADMIN_FORM_CONTROL_TEXT,
+				}}},
+			},
 		},
 		ResolveClient: func(context.Context, int, string) (WatchSyncPluginClient, error) {
 			return &fakeWatchSyncPluginClient{}, nil
@@ -452,7 +470,7 @@ func TestPluginProviderEnforcesConnectionAdminFormValidation(t *testing.T) {
 		}},
 		ConnectionConfigSchema: []*pluginv1.ConfigSchema{{
 			Key: "server", Required: true,
-			JsonSchema: `{"type":"object","properties":{"name":{"type":"string"},"port":{"type":"number"},"password":{"type":"string","format":"password"}},"required":["name","port","password"]}`,
+			JsonSchema: `{"type":"object","properties":{"name":{"type":"string"},"port":{},"password":{"type":"string","format":"password"}},"required":["name","port","password"]}`,
 			AdminForm: &pluginv1.AdminFormDescriptor{Fields: []*pluginv1.AdminFormField{
 				{Key: "name", Control: pluginv1.AdminFormControl_ADMIN_FORM_CONTROL_TEXT, Validation: &pluginv1.AdminFormValidation{Pattern: `^[a-z]+$`, MinLength: 3, MaxLength: 8}},
 				{Key: "port", Control: pluginv1.AdminFormControl_ADMIN_FORM_CONTROL_NUMBER, Validation: &pluginv1.AdminFormValidation{HasMin: true, Min: 1, HasMax: true, Max: 65535}},
@@ -474,6 +492,7 @@ func TestPluginProviderEnforcesConnectionAdminFormValidation(t *testing.T) {
 	}{
 		{name: "pattern", values: map[string]any{"name": "Bad", "port": 443.0, "password": "long-enough"}, message: "is invalid"},
 		{name: "number", values: map[string]any{"name": "good", "port": 70000.0, "password": "long-enough"}, message: "at most 65535"},
+		{name: "numeric string", values: map[string]any{"name": "good", "port": "70000", "password": "long-enough"}, message: "at most 65535"},
 		{name: "secret length", values: map[string]any{"name": "good", "port": 443.0, "password": "leaky"}, message: "at least 8 characters"},
 	}
 	for _, tt := range tests {