diff --git a/loop/server/templates/system_prompt_debug.html b/loop/server/templates/system_prompt_debug.html
new file mode 100644
index 0000000..e7efdad
--- /dev/null
+++ b/loop/server/templates/system_prompt_debug.html
@@ -0,0 +1,90 @@
+<!doctype html>
+<html>
+  <head>
+    <title>Sketch System Prompt Debug</title>
+    <style>
+      body {
+        font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
+        margin: 40px;
+      }
+      h1 {
+        color: #333;
+      }
+      .prompt-container {
+        background: #f8f9fa;
+        border: 1px solid #e9ecef;
+        border-radius: 6px;
+        padding: 20px;
+        margin: 20px 0;
+      }
+      .prompt-content {
+        background: #ffffff;
+        border: 1px solid #d0d7de;
+        border-radius: 4px;
+        padding: 16px;
+        font-family: "SF Mono", Monaco, monospace;
+        font-size: 13px;
+        line-height: 1.5;
+        white-space: pre-wrap;
+        word-wrap: break-word;
+        max-height: 70vh;
+        overflow-y: auto;
+      }
+      .summary {
+        background: #e6f3ff;
+        border-left: 4px solid #0366d6;
+        padding: 16px;
+        margin-bottom: 30px;
+      }
+      .copy-button {
+        background: #0366d6;
+        color: white;
+        border: none;
+        padding: 8px 16px;
+        border-radius: 4px;
+        cursor: pointer;
+        margin-bottom: 10px;
+        font-size: 12px;
+      }
+      .copy-button:hover {
+        background: #0250a3;
+      }
+      .stats {
+        font-size: 0.9em;
+        color: #656d76;
+        margin-bottom: 10px;
+      }
+    </style>
+  </head>
+  <body>
+    <h1>Sketch System Prompt Debug</h1>
+    <div class="stats">
+      <strong>Length:</strong> {{.Length}} characters |
+      <strong>Lines:</strong> {{.Lines}}
+    </div>
+    <div class="prompt-container">
+      <button class="copy-button" onclick="copyToClipboard()">
+        Copy to Clipboard
+      </button>
+      <div class="prompt-content" id="prompt-content">{{.SystemPrompt}}</div>
+    </div>
+    <script>
+      function copyToClipboard() {
+        const content = document.getElementById("prompt-content").textContent;
+        navigator.clipboard
+          .writeText(content)
+          .then(() => {
+            const button = document.querySelector(".copy-button");
+            const originalText = button.textContent;
+            button.textContent = "Copied!";
+            setTimeout(() => {
+              button.textContent = originalText;
+            }, 2000);
+          })
+          .catch((err) => {
+            alert("Failed to copy to clipboard");
+          });
+      }
+    </script>
+  </body>
+</html>