diff --git a/index.html b/index.html
index 77b6cc9..7854333 100644
--- a/index.html
+++ b/index.html
@@ -465,10 +465,13 @@ <h3><a href="/beijing-loop/">Beijing — Endless <span class="ul" data-ink="1">S
         <span class="pen-note pen-note--b" aria-hidden="true">one take</span>
       </li>
       <li class="lab" data-ruled>
-        <p class="lab__n"><span class="mono">Exp. 03 · Cloudflare Workers</span><span class="mono">live demo</span></p>
-        <h3><a href="https://open-ledger.brickerp.workers.dev"><span class="ul" data-ink="2">open-ledger</span></a></h3>
-        <p class="lab__fact">Every fill hash-chained into an append-only ledger · verify it in the browser</p>
-        <span class="lab__go">Open the ledger ↗</span>
+        <p class="lab__n"><span class="mono">Exp. 03 · open research · monthly</span><span class="mono">10 models · 8 labs</span></p>
+        <h3><a href="https://brickerp.github.io/agent-stack-index/">Agent <span class="ul" data-ink="2">Stack Index</span></a></h3>
+        <p class="lab__fact">What AI coding models pick when they start a project from scratch · 29 categories · 2,670 answers · open data</p>
+        <div class="lab__links">
+          <span class="lab__go">Read the index ↗</span>
+          <a class="lab__go lab__go--alt" href="https://github.com/BrickerP/agent-stack-index">data &amp; code ↗</a>
+        </div>
         <span class="pen-note pen-note--c" aria-hidden="true">verify it yourself</span>
       </li>
       <li class="lab" data-ruled>
@@ -489,7 +492,7 @@ <h3>Agent platform &amp; <span class="ul" data-ink="4">revenue backend</span></h
         <span class="pen-note pen-note--e" aria-hidden="true">ask me about this</span>
       </li>
     </ol>
-    <p class="also">Also: <a href="https://ledger-mcp.brickerp.workers.dev">ledger-mcp ↗</a>&nbsp;· <a href="/about/">full programme →</a>&nbsp;· <a href="/resume.pdf">resume (PDF)</a></p>
+    <p class="also">Also: <a href="/about/">full programme →</a>&nbsp;· <a href="/resume.pdf">resume (PDF)</a></p>
   </div>
 </section>
 
diff --git a/scripts/verify-static.mjs b/scripts/verify-static.mjs
index a1b4115..bca66dc 100644
--- a/scripts/verify-static.mjs
+++ b/scripts/verify-static.mjs
@@ -627,6 +627,13 @@ for (const [, href, label] of rootHtml.matchAll(/<a\b[^>]*href=["']([^"']+)["'][
 assert.match(rootHtml, /<h3><a href="https:\/\/github\.com\/cookiy-ai\/user-research-skill">/, 'index.html: the Cookiy entry must open user-research-skill, its most-starred public repository');
 assert.doesNotMatch(rootHtml, /npmjs\.com\/package\/cookiy/, 'index.html: the Cookiy entry must not stop at a package page');
 assert.doesNotMatch(rootHtml, /href=["']\/hire\/["']/, 'index.html: /hire/ only redirects back to #contact and must not be linked from the homepage');
+assert.doesNotMatch(rootHtml, /open-ledger|ledger-mcp/, 'index.html: the retired ledger Workers must not be linked from the homepage');
+assert.match(
+  rootHtml,
+  /<h3><a href="https:\/\/brickerp\.github\.io\/agent-stack-index\/">Agent <span class="ul" data-ink="2">Stack Index<\/span><\/a><\/h3>/,
+  'index.html: Exp. 03 must open the live Agent Stack Index report',
+);
+assert.match(rootHtml, /<a\b[^>]*href=["']https:\/\/github\.com\/BrickerP\/agent-stack-index["']/, 'index.html: Exp. 03 must link its open data and code');
 
 // Fig. 2: a seeded random process with a stop rule, measured over 999
 // futures — canvases for the drawing, the numbers printed from the sim,
diff --git a/src/pens.ts b/src/pens.ts
index 326666d..7c4706b 100644
--- a/src/pens.ts
+++ b/src/pens.ts
@@ -57,7 +57,7 @@ const HANDS: ReadonlyArray<readonly [Hand, Hand]> = [
     { seed: 23, from: -2, to: 6, y: 5.6, tilt: 1.6, amp: 0.9, tremble: 0.2, w: 3.2, floor: 0.22, flick: 1.2 },
     { seed: 24, from: 10, to: -3, y: 12.6, tilt: -1.4, amp: 0.8, tremble: 0.3, w: 2.2, floor: 0.2 },
   ],
-  // 2 · open-ledger — wavy, and the second pass leaves with a curl
+  // 2 · Stack Index — wavy, and the second pass leaves with a curl
   [
     { seed: 35, from: -5, to: 4, y: 5.4, tilt: 0.4, amp: 1.5, tremble: 0.5, w: 2.8, floor: 0.3, hook: 0.8 },
     { seed: 36, from: 6, to: -8, y: 11.4, tilt: -0.6, amp: 1.1, tremble: 0.4, w: 2.0, floor: 0.28, loop: true },