diff --git a/extensions/render.ts b/extensions/render.ts
index 879179f..3f0c786 100644
--- a/extensions/render.ts
+++ b/extensions/render.ts
@@ -1,5 +1,7 @@
 // extensions/render.ts
 import { chromium } from "playwright-core"
+import { Type } from "typebox"
+
 import { pathToFileURL } from "node:url"
 import { writeFileSync, mkdirSync } from "node:fs"
 import { join } from "node:path"
@@ -186,14 +188,15 @@ export default function (pi: any) {
   pi.registerTool({
     name: "keystone_render",
     description: "Render an HTML file with headless Chromium at given viewports. Returns screenshots + computed styles + DOM snapshot for the Keystone gate engine.",
-    parameters: {
-      htmlPath: { type: "string", description: "Absolute path to the HTML file to render" },
-      url: { type: "string", description: "Optional live URL to render instead of htmlPath (audit URL mode). If set, htmlPath is ignored." },
-      viewports: { type: "array", items: { type: "number" }, description: "CSS pixel widths to screenshot", default: [1280, 375, 320, 414, 768] },
-      outDir: { type: "string", description: "Directory to write outputs", default: "./keystone-render" },
-    },
+    parameters: Type.Object({
+      htmlPath: Type.String({ description: "Absolute path to the HTML file to render" }),
+      url: Type.Optional(Type.String({ description: "Optional live URL to render instead of htmlPath (audit URL mode). If set, htmlPath is ignored." })),
+      viewports: Type.Optional(Type.Array(Type.Number({ description: "CSS pixel widths to screenshot" }))),
+      outDir: Type.Optional(Type.String({ description: "Directory to write outputs" })),
+    }),
     async execute(_toolCallId: string, input: RenderInput) {
-      return render(input)
+      const result = await render(input)
+      return { content: [{ type: "text" as const, text: JSON.stringify(result, null, 2) }], details: result }
     },
   })
 }
diff --git a/package.json b/package.json
index 29c63ff..ee49040 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "@getpipher/keystone",
-  "version": "1.0.1",
+  "version": "1.0.2",
   "description": "Anti-AI-slop design skill with an executable gate engine. Beats Hallmark by enforcing its gates instead of imagining them.",
   "keywords": [
     "pi-package",
@@ -52,7 +52,8 @@
   },
   "devDependencies": {
     "@types/node": "^24.13.3",
-    "playwright": "1.62.0"
+    "playwright": "1.62.0",
+    "typebox": "*"
   },
   "packageManager": "pnpm@10.33.2"
 }
diff --git a/pnpm-lock.yaml b/pnpm-lock.yaml
index 572260e..e23119f 100644
--- a/pnpm-lock.yaml
+++ b/pnpm-lock.yaml
@@ -27,6 +27,9 @@ importers:
       playwright:
         specifier: 1.62.0
         version: 1.62.0
+      typebox:
+        specifier: '*'
+        version: 1.3.28
 
 packages:
 
@@ -310,6 +313,9 @@ packages:
     engines: {node: '>=18.0.0'}
     hasBin: true
 
+  typebox@1.3.28:
+    resolution: {integrity: sha512-5hTNlwzKj7BPPqhT91TPa4fK9bh/ZOei7mzweMpNidwLTxtduXHgr/OAbwx4mRW8aKFYu1I8fT1+0+PQtst1/g==}
+
   uhyphen@0.2.0:
     resolution: {integrity: sha512-qz3o9CHXmJJPGBdqzab7qAYuW8kQGKNEuoHFYrBwV6hWIMcpAmxDLXojcHfFr9US1Pe6zUswEIJIbLI610fuqA==}
 
@@ -538,6 +544,8 @@ snapshots:
     optionalDependencies:
       fsevents: 2.3.3
 
+  typebox@1.3.28: {}
+
   uhyphen@0.2.0: {}
 
   undici-types@7.18.2: {}