diff --git a/packages/shared/src/favicon.test.ts b/packages/shared/src/favicon.test.ts
index ce80a079b3fd..676f7811011e 100644
--- a/packages/shared/src/favicon.test.ts
+++ b/packages/shared/src/favicon.test.ts
@@ -1,11 +1,6 @@
 import { describe, expect, it } from "@effect/vitest";
 
-import {
-  explicitFaviconUrl,
-  faviconUrlForOrigin,
-  faviconUrlForPage,
-  toolActivityFaviconUrl,
-} from "./favicon.ts";
+import { faviconUrlForOrigin, toolActivityFaviconUrl } from "./favicon.ts";
 
 describe("faviconUrlForOrigin", () => {
   it.each([
@@ -46,12 +41,12 @@ describe("faviconUrlForOrigin", () => {
   );
 });
 
-describe("faviconUrlForPage", () => {
+describe("toolActivityFaviconUrl", () => {
   it("uses the page origin instead of a third-party favicon service", () => {
-    expect(faviconUrlForPage("https://example.com/docs/page?q=1")).toBe(
+    expect(toolActivityFaviconUrl({ pageUrl: "https://example.com/docs/page?q=1" }, "light")).toBe(
       "https://example.com/favicon.ico",
     );
-    expect(faviconUrlForPage("http://localhost:5173/app")).toBe(
+    expect(toolActivityFaviconUrl({ pageUrl: "http://localhost:5173/app" }, "light")).toBe(
       "http://localhost:5173/favicon.ico",
     );
   });
@@ -86,7 +81,17 @@ describe("faviconUrlForPage", () => {
   });
 
   it("accepts provider-supplied image URLs but rejects extension URLs", () => {
-    expect(explicitFaviconUrl("https://example.com/icon.png")).toBe("https://example.com/icon.png");
-    expect(explicitFaviconUrl("chrome-extension://example/_favicon/")).toBeNull();
+    expect(
+      toolActivityFaviconUrl(
+        { pageUrl: "https://example.com/docs", faviconUrl: "https://example.com/icon.png" },
+        "light",
+      ),
+    ).toBe("https://example.com/icon.png");
+    expect(
+      toolActivityFaviconUrl(
+        { pageUrl: "https://example.com/docs", faviconUrl: "chrome-extension://example/_favicon/" },
+        "light",
+      ),
+    ).toBe("https://example.com/favicon.ico");
   });
 });
diff --git a/packages/shared/src/favicon.ts b/packages/shared/src/favicon.ts
index a3286b28e99a..2c4847115b90 100644
--- a/packages/shared/src/favicon.ts
+++ b/packages/shared/src/favicon.ts
@@ -5,7 +5,7 @@ import { isPublicFaviconHost } from "./hostClassification.ts";
  * conventional favicon and let the image element fall back to a browser glyph.
  * Chrome-backed tools can pass their tab's explicit favicon URL separately.
  */
-export function faviconUrlForPage(rawUrl: string | null | undefined, _size = 32): string | null {
+function faviconUrlForPage(rawUrl: string | null | undefined, _size = 32): string | null {
   if (!rawUrl || rawUrl.length > 4096) return null;
   try {
     const pageUrl = new URL(rawUrl);
@@ -40,7 +40,7 @@ function themedFaviconUrlForPage(
 }
 
 /** Accepts image URLs supplied by a trusted provider event. */
-export function explicitFaviconUrl(rawUrl: string | null | undefined): string | null {
+function explicitFaviconUrl(rawUrl: string | null | undefined): string | null {
   if (!rawUrl || rawUrl.length > 4096) return null;
   try {
     const url = new URL(rawUrl);