diff --git a/web/src/lib/components/kit/SchemaActions.svelte b/web/src/lib/components/kit/SchemaActions.svelte
index fb1015d..ddd3bf7 100644
--- a/web/src/lib/components/kit/SchemaActions.svelte
+++ b/web/src/lib/components/kit/SchemaActions.svelte
@@ -3,7 +3,7 @@
 	import { Sparkles, Upload } from "@lucide/svelte";
 
 	interface Props {
-		inputMode: "file" | "text" | "none";
+		inputMode: "image" | "text" | "none";
 		canDownload: boolean;
 		running: boolean;
 		onupload: (file: File) => void;
@@ -26,7 +26,7 @@
 			<Sparkles size={14} />
 			{running ? "Generating…" : "Generate"}
 		</button>
-	{:else if inputMode === "file"}
+	{:else if inputMode === "image"}
 		<label class="btn upload">
 			<Upload size={14} /> Open image
 			<input
diff --git a/web/src/lib/components/kit/SchemaPreview.svelte b/web/src/lib/components/kit/SchemaPreview.svelte
index 7acf0cc..64ef0f1 100644
--- a/web/src/lib/components/kit/SchemaPreview.svelte
+++ b/web/src/lib/components/kit/SchemaPreview.svelte
@@ -4,10 +4,11 @@
 	import SchemaResultTile from "$lib/components/kit/SchemaResultTile.svelte";
 	import SchemaSourceTile from "$lib/components/kit/SchemaSourceTile.svelte";
 	import type { PixelImage } from "$lib/core/types";
+	import type { InputMode, ResultKind } from "$lib/registry-new";
 
 	interface Props {
-		inputMode?: "file" | "text" | "none";
-		resultKind?: "image" | "text" | "verdict";
+		inputMode: InputMode;
+		resultKind?: ResultKind;
 		source: PixelImage | null;
 		result: PixelImage | null;
 		textSource?: string;
@@ -23,7 +24,7 @@
 		ondownload: () => void;
 	}
 	let {
-		inputMode = "file",
+		inputMode,
 		resultKind = "image",
 		source,
 		result,
@@ -80,21 +81,19 @@
 {/if}
 
 <div class="pair">
-	{#if !isGenerator}
-		<SchemaSourceTile
-			mode={inputMode === "text" ? "text" : "file"}
-			{source}
-			{textSource}
-			{running}
-			ontextinput={ontextsource}
-			{onrendertext}
-		/>
-	{/if}
+	<SchemaSourceTile
+		mode={inputMode}
+		{source}
+		{textSource}
+		{running}
+		ontextinput={ontextsource}
+		{onrendertext}
+	/>
 	<SchemaResultTile
 		{resultKind}
 		{result}
 		{textResult}
-		wide={isGenerator || resultKind !== "image"}
+		wide={resultKind !== "image"}
 		{running}
 		oncopy={oncopytext}
 		{ondownloadtxt}
diff --git a/web/src/lib/components/kit/SchemaSourceTile.svelte b/web/src/lib/components/kit/SchemaSourceTile.svelte
index 2ab6b61..72e65dd 100644
--- a/web/src/lib/components/kit/SchemaSourceTile.svelte
+++ b/web/src/lib/components/kit/SchemaSourceTile.svelte
@@ -1,10 +1,11 @@
 <script lang="ts">
 	import { toDataUrl } from "$lib/core/io";
 	import type { PixelImage } from "$lib/core/types";
+	import type { InputMode } from "$lib/registry-new";
 	import SchemaTextSource from "./SchemaTextSource.svelte";
 
 	interface Props {
-		mode: "file" | "text";
+		mode: InputMode;
 		source: PixelImage | null;
 		textSource?: string;
 		running?: boolean;
@@ -35,10 +36,12 @@
 					onrender={onrendertext ?? (() => {})}
 				/>
 			</div>
-		{:else if sourceUrl}
+		{:else if mode === "image" && sourceUrl}
 			<img src={sourceUrl} alt="source" />
-		{:else}
+		{:else if mode === "image"}
 			<span class="empty">choose an image</span>
+		{:else}
+			<span class="empty">no source — configure the parameters</span>
 		{/if}
 	</div>
 </figure>
diff --git a/web/src/lib/components/kit/SchemaToolView.svelte b/web/src/lib/components/kit/SchemaToolView.svelte
index 98f796d..1c904ec 100644
--- a/web/src/lib/components/kit/SchemaToolView.svelte
+++ b/web/src/lib/components/kit/SchemaToolView.svelte
@@ -2,15 +2,11 @@
 	import SchemaFields from "$lib/components/kit/SchemaFields.svelte";
 	import SchemaPreview from "$lib/components/kit/SchemaPreview.svelte";
 	import { debounce } from "$lib/core/debounce";
+	import { ToolError } from "$lib/core/errors";
 	import { decodeFile, encode } from "$lib/core/io";
 	import type { PixelImage } from "$lib/core/types";
-	import {
-		executeFromText,
-		executeGenerate,
-		executeStep,
-		executeTextToText,
-		executeToText,
-	} from "$lib/preview/executor";
+	import { t } from "$lib/i18n/t";
+	import { execute } from "$lib/preview/executor";
 	import type { ToolEntry } from "$lib/registry-new";
 	import {
 		defaultSchemaParams,
@@ -27,8 +23,7 @@
 		tool.schema as ToolSchema<Record<string, unknown>> | undefined,
 	);
 
-	const isGenerator = $derived(Boolean(tool.generate && !tool.run));
-	const inputMode = $derived(tool.input ?? "file");
+	const inputMode = $derived(tool.input);
 	const resultKind = $derived(tool.result ?? "image");
 
 	let values = $state<Record<string, unknown>>({});
@@ -70,33 +65,20 @@
 
 	async function run() {
 		if (!schema) return;
-		if (isGenerator) {
-			if (!tool.generate) return;
-			await runGenerate();
-			return;
-		}
 		error = "";
-		const params = sanitizeSchemaParams(schema, values);
 		running = true;
 		try {
-			if (inputMode === "text") {
-				if (!textSource.trim()) return;
-				if (tool.textToText) {
-					textResult = await executeTextToText(tool, textSource);
-					result = null;
-				} else {
-					result = await executeFromText(tool, textSource, params);
-					textResult = null;
-				}
+			const out = await execute(tool, {
+				params: sanitizeSchemaParams(schema, values),
+				source: source ?? undefined,
+				text: textSource || undefined,
+			});
+			if (resultKind === "image") {
+				result = out as PixelImage;
+				textResult = null;
 			} else {
-				if (!source) return;
-				if (resultKind !== "image" && tool.toText) {
-					textResult = await executeToText(tool, source, params);
-					result = null;
-				} else {
-					result = await executeStep(tool, source, params);
-					textResult = null;
-				}
+				textResult = out as string;
+				result = null;
 			}
 		} catch (e) {
 			error = errorText(e);
@@ -105,20 +87,6 @@
 		}
 	}
 
-	async function runGenerate() {
-		if (!schema || !tool.generate) return;
-		running = true;
-		error = "";
-		const params = sanitizeSchemaParams(schema, values);
-		try {
-			result = await executeGenerate(tool, params);
-		} catch (e) {
-			error = errorText(e);
-		} finally {
-			running = false;
-		}
-	}
-
 	async function download() {
 		if (!result || !schema) return;
 		const out = tool.output;
@@ -159,14 +127,16 @@
 	});
 
 	$effect(() => {
-		if (inputMode === "text" || isGenerator || !source || !started) return;
+		if (inputMode !== "image" || !source || !started) return;
 		void values;
 		debouncedRun();
 		return () => debouncedRun.cancel();
 	});
 
 	function errorText(e: unknown): string {
-		return e instanceof Error ? e.message : String(e);
+		if (e instanceof ToolError) return t(e.key, e.vars);
+		if (e instanceof Error) return e.message;
+		return String(e);
 	}
 </script>
 
@@ -201,9 +171,9 @@
 					{running}
 					{error}
 					onupload={handleFile}
-					ongenerate={runGenerate}
-					ontextsource={(t) => {
-						textSource = t;
+					ongenerate={run}
+					ontextsource={(textValue) => {
+						textSource = textValue;
 					}}
 					onrendertext={run}
 					oncopytext={copyText}