diff --git a/actions/setup/js/gateway_difc_filtered.cjs b/actions/setup/js/gateway_difc_filtered.cjs
index 56a7285feda..d7ba5fbccd6 100644
--- a/actions/setup/js/gateway_difc_filtered.cjs
+++ b/actions/setup/js/gateway_difc_filtered.cjs
@@ -94,7 +94,7 @@ function generateDifcFilteredSection(filteredEvents) {
 
   let section = "\n\n> [!NOTE]\n";
   section += `> <details>\n`;
-  section += `> <summary>**🔒 Integrity filter blocked ${count} ${itemWord}**</summary>\n`;
+  section += `> <summary><b>🔒 Integrity filter blocked ${count} ${itemWord}</b></summary>\n`;
   section += `>\n`;
   section += `> The following ${itemWord} were blocked because they don't meet the GitHub integrity level.\n`;
   section += `>\n`;
@@ -110,7 +110,8 @@ function generateDifcFilteredSection(filteredEvents) {
       reference = `[${label}](${event.html_url})`;
     } else {
       const desc = event.description ? event.description.replace(/^[a-z-]+:(?!\/\/)/i, "") : null;
-      reference = desc || (event.tool_name ? `\`${event.tool_name}\`` : "-");
+      const validDesc = desc && desc !== "#unknown" ? desc : null;
+      reference = validDesc || (event.tool_name ? `\`${event.tool_name}\`` : "-");
     }
     const tool = event.tool_name ? `\`${event.tool_name}\`` : "-";
     const reason = (event.reason || "-").replace(/^Resource '[^']*' /, "").replace(/\n/g, " ");
diff --git a/actions/setup/js/gateway_difc_filtered.test.cjs b/actions/setup/js/gateway_difc_filtered.test.cjs
index 414e8b689ab..9f4ba9cda0c 100644
--- a/actions/setup/js/gateway_difc_filtered.test.cjs
+++ b/actions/setup/js/gateway_difc_filtered.test.cjs
@@ -175,7 +175,7 @@ describe("gateway_difc_filtered.cjs", () => {
       expect(result).toContain("> [!NOTE]");
       expect(result).toContain("> <details>");
       expect(result).toContain("> </details>");
-      expect(result).toContain("> <summary>**🔒 Integrity filter blocked 1 item**</summary>");
+      expect(result).toContain("> <summary><b>🔒 Integrity filter blocked 1 item</b></summary>");
       expect(result).toContain("[#42](https://github.com/org/repo/issues/42)");
       expect(result).toContain("`list_issues`");
       expect(result).toContain("Integrity check failed");
@@ -202,7 +202,7 @@ describe("gateway_difc_filtered.cjs", () => {
       const result = generateDifcFilteredSection(events);
 
       expect(result).toContain("> [!NOTE]");
-      expect(result).toContain("> <summary>**🔒 Integrity filter blocked 2 items**</summary>");
+      expect(result).toContain("> <summary><b>🔒 Integrity filter blocked 2 items</b></summary>");
       expect(result).toContain("[#42](https://github.com/org/repo/issues/42)");
       expect(result).toContain("[#99](https://github.com/org/repo/issues/99)");
     });
@@ -318,7 +318,7 @@ describe("gateway_difc_filtered.cjs", () => {
 
       const result = generateDifcFilteredSection(events);
 
-      expect(result).toContain("> <summary>**🔒 Integrity filter blocked 2 items**</summary>");
+      expect(result).toContain("> <summary><b>🔒 Integrity filter blocked 2 items</b></summary>");
       expect(result).toContain("[#42](https://github.com/org/repo/issues/42)");
       expect(result).toContain("[#99](https://github.com/org/repo/issues/99)");
     });
@@ -363,7 +363,7 @@ describe("gateway_difc_filtered.cjs", () => {
       const result = generateDifcFilteredSection(events);
 
       // Summary still shows the total count
-      expect(result).toContain("> <summary>**🔒 Integrity filter blocked 20 items**</summary>");
+      expect(result).toContain("> <summary><b>🔒 Integrity filter blocked 20 items</b></summary>");
       // First 16 items rendered
       expect(result).toContain("[#1](https://github.com/org/repo/issues/1)");
       expect(result).toContain("[#16](https://github.com/org/repo/issues/16)");
@@ -397,5 +397,48 @@ describe("gateway_difc_filtered.cjs", () => {
       expect(result).toContain("... and 1 more item");
       expect(result).not.toContain("... and 1 more items");
     });
+
+    it("should show events with #unknown description using tool_name instead", () => {
+      const events = [
+        {
+          type: "DIFC_FILTERED",
+          tool_name: "search_issues",
+          description: "github:#unknown",
+          reason: "has lower integrity than agent requires.",
+        },
+        {
+          type: "DIFC_FILTERED",
+          tool_name: "list_issues",
+          reason: "Integrity check failed",
+          html_url: "https://github.com/org/repo/issues/42",
+          number: "42",
+        },
+      ];
+
+      const result = generateDifcFilteredSection(events);
+
+      // Both entries should be shown; #unknown text hidden, tool_name used instead
+      expect(result).toContain("> <summary><b>🔒 Integrity filter blocked 2 items</b></summary>");
+      expect(result).not.toContain("#unknown");
+      expect(result).toContain("`search_issues`");
+      expect(result).toContain("[#42](https://github.com/org/repo/issues/42)");
+    });
+
+    it("should show entry using tool_name when description is #unknown", () => {
+      const events = [
+        {
+          type: "DIFC_FILTERED",
+          tool_name: "search_issues",
+          description: "github:#unknown",
+          reason: "has lower integrity",
+        },
+      ];
+
+      const result = generateDifcFilteredSection(events);
+
+      expect(result).toContain("> <summary><b>🔒 Integrity filter blocked 1 item</b></summary>");
+      expect(result).toContain("`search_issues`");
+      expect(result).not.toContain("#unknown");
+    });
   });
 });