diff --git a/loop/server/debug_tools_test.go b/loop/server/debug_tools_test.go
new file mode 100644
index 0000000..87ad354
--- /dev/null
+++ b/loop/server/debug_tools_test.go
@@ -0,0 +1,44 @@
+package server
+
+import (
+	"net/http/httptest"
+	"strings"
+	"testing"
+
+	"sketch.dev/llm"
+)
+
+func TestRenderToolsDebugPage_UsesPre(t *testing.T) {
+	tools := []*llm.Tool{
+		{
+			Name:        "test_tool",
+			Description: "This is a test tool\nwith multiple lines\nand formatting",
+			InputSchema: []byte(`{"type": "object"}`),
+		},
+	}
+
+	w := httptest.NewRecorder()
+	renderToolsDebugPage(w, tools)
+	html := w.Body.String()
+
+	// Verify CSS includes pre-wrap styling
+	if !strings.Contains(html, "white-space: pre-wrap") {
+		t.Error("Expected CSS to contain 'white-space: pre-wrap'")
+	}
+	if !strings.Contains(html, "font-family: 'SF Mono', Monaco, monospace") {
+		t.Error("Expected CSS to contain monospace font-family")
+	}
+
+	// Verify HTML uses <pre> tag for tool description
+	if !strings.Contains(html, `<pre class="tool-description">`) {
+		t.Error("Expected HTML to use <pre class=\"tool-description\"> tag")
+	}
+	if strings.Contains(html, `<div class="tool-description">`) {
+		t.Error("Expected HTML to NOT use <div class=\"tool-description\"> tag")
+	}
+
+	// Verify the description content is preserved
+	if !strings.Contains(html, "This is a test tool") {
+		t.Error("Expected tool description to be included")
+	}
+}
diff --git a/loop/server/loophttp.go b/loop/server/loophttp.go
index 856932d..5abe750 100644
--- a/loop/server/loophttp.go
+++ b/loop/server/loophttp.go
@@ -1257,7 +1257,7 @@
 		h1 { color: #333; }
 		.tool { background: #f8f9fa; border: 1px solid #e9ecef; border-radius: 6px; padding: 20px; margin: 20px 0; }
 		.tool-name { font-size: 1.2em; font-weight: bold; color: #0366d6; margin-bottom: 8px; }
-		.tool-description { color: #586069; margin-bottom: 12px; }
+		.tool-description { color: #586069; margin-bottom: 12px; white-space: pre-wrap; font-family: 'SF Mono', Monaco, monospace; }
 		.tool-schema { background: #f6f8fa; border: 1px solid #d0d7de; border-radius: 4px; padding: 12px; font-family: 'SF Mono', Monaco, monospace; font-size: 12px; overflow-x: auto; }
 		.tool-meta { font-size: 0.9em; color: #656d76; margin-top: 8px; }
 		.summary { background: #e6f3ff; border-left: 4px solid #0366d6; padding: 16px; margin-bottom: 30px; }
@@ -1276,7 +1276,7 @@
 `, i+1, html.EscapeString(tool.Name))
 
 		if tool.Description != "" {
-			fmt.Fprintf(w, `		<div class="tool-description">%s</div>
+			fmt.Fprintf(w, `		<pre class="tool-description">%s</pre>
 `, html.EscapeString(tool.Description))
 		}