diff --git a/web/src/lib/components/kit/SchemaFields.svelte b/web/src/lib/components/kit/SchemaFields.svelte
index a3ec54a..64370ec 100644
--- a/web/src/lib/components/kit/SchemaFields.svelte
+++ b/web/src/lib/components/kit/SchemaFields.svelte
@@ -1,23 +1,27 @@
 <script lang="ts">
+	import type {
+		FieldSpec,
+		FieldSpecKind,
+		ToolSchema,
+	} from "$lib/registry-schema";
 	import { RotateCcw } from "@lucide/svelte";
-	import type { ToolSchema } from "$lib/registry-schema";
+	import type { Component } from "svelte";
+	import DimensionField from "./fields/DimensionField.svelte";
 	import CheckboxControl from "./fields/schema/CheckboxControl.svelte";
 	import ColorControl from "./fields/schema/ColorControl.svelte";
 	import ColorPairControl from "./fields/schema/ColorPairControl.svelte";
 	import RangeControl from "./fields/schema/RangeControl.svelte";
 	import SelectControl from "./fields/schema/SelectControl.svelte";
 	import TextControl from "./fields/schema/TextControl.svelte";
-	import DimensionField from "./fields/DimensionField.svelte";
 
-	interface Props {
-		schema: ToolSchema<Record<string, unknown>>;
-		values: Record<string, unknown>;
-		onchange: (id: string, value: unknown) => void;
-		onreset: () => void;
+	interface FieldControlProps {
+		label: string;
+		value: unknown;
+		spec: FieldSpec;
+		onchange?: (value: unknown) => void;
 	}
-	let { schema, values, onchange, onreset }: Props = $props();
 
-	const FIELDS = {
+	const FIELDS: Record<FieldSpecKind, Component<FieldControlProps>> = {
 		number: RangeControl,
 		slider: RangeControl,
 		color: ColorControl,
@@ -26,7 +30,15 @@
 		checkbox: CheckboxControl,
 		text: TextControl,
 		dimension: DimensionField,
-	} as const;
+	};
+
+	interface Props {
+		schema: ToolSchema<Record<string, unknown>>;
+		values: Record<string, unknown>;
+		onchange: (id: string, value: unknown) => void;
+		onreset: () => void;
+	}
+	let { schema, values, onchange, onreset }: Props = $props();
 
 	function labelOf(id: string): string {
 		return id
diff --git a/web/src/lib/registry-schema.ts b/web/src/lib/registry-schema.ts
index 8e64d3d..e079faf 100644
--- a/web/src/lib/registry-schema.ts
+++ b/web/src/lib/registry-schema.ts
@@ -76,15 +76,26 @@ export interface ColorPairSpec {
 	to: string;
 }
 
-export type FieldSpec =
-	| NumberSpec
-	| SliderSpec
-	| ColorSpec
-	| SelectSpec
-	| TextSpec
-	| CheckboxSpec
-	| DimensionSpec
-	| ColorPairSpec;
+/**
+ * «Объект as const» kind → спека поля. Единственный источник правды для
+ * перечня kinds: `FieldSpecKind` = ключи map, `FieldSpec` = значение по любому
+ * ключу (тот же union). Добавляем новый составной тип — добавляем сюда, и
+ * type-checker укажет, где его не хватает (record контролов, default/sanitize).
+ */
+export const fieldSpecs = {
+	number: {} as NumberSpec,
+	slider: {} as SliderSpec,
+	color: {} as ColorSpec,
+	select: {} as SelectSpec,
+	text: {} as TextSpec,
+	checkbox: {} as CheckboxSpec,
+	dimension: {} as DimensionSpec,
+	"color-pair": {} as ColorPairSpec,
+} as const;
+
+export type FieldSpecKind = keyof typeof fieldSpecs;
+export type FieldSpecOf<K extends FieldSpecKind> = (typeof fieldSpecs)[K];
+export type FieldSpec = FieldSpecOf<FieldSpecKind>;
 
 /** `Field<T>`: runtime-спека поля + phantom-тип ожидаемого значения (number|string|boolean). */
 export interface Field<T> {