diff --git a/src/renderer/src/components/agent/AgentCombobox.test.tsx b/src/renderer/src/components/agent/AgentCombobox.test.tsx
index d9dd02c751f..7ac5a9187bc 100644
--- a/src/renderer/src/components/agent/AgentCombobox.test.tsx
+++ b/src/renderer/src/components/agent/AgentCombobox.test.tsx
@@ -210,6 +210,13 @@ describe('AgentCombobox', () => {
     expect(markup).not.toContain('<img')
   })
 
+  it('uses the bundled DeepSeek whale for observed DeepSeek Build sessions without adding it to the launch catalog', () => {
+    const markup = renderToStaticMarkup(<AgentIcon agent="dsb" />)
+
+    expect(markup).toContain(AGENT_FAVICON_ASSETS.dsh)
+    expect(AGENT_CATALOG.map((agent) => agent.id)).not.toContain('dsb')
+  })
+
   it('renders bundled favicons for favicon-domain agents instead of the remote Google service', () => {
     // Why: previously loaded from Google's favicon service (#8451). Iterate the
     // full asset map so missing files/key mismatches fail the test.
diff --git a/src/renderer/src/lib/agent-catalog.tsx b/src/renderer/src/lib/agent-catalog.tsx
index 80056139437..ea3f814c7f3 100644
--- a/src/renderer/src/lib/agent-catalog.tsx
+++ b/src/renderer/src/lib/agent-catalog.tsx
@@ -84,7 +84,9 @@ export function AgentIcon({
   // Why: prefer the favicon bundled at build time so the icon renders without a
   // live network request — Google's favicon service is unreachable in some
   // regions and offline, which left these icons broken (#8451).
-  const bundledFaviconUrl = AGENT_FAVICON_ASSETS[agent]
+  // Why: recognition-only DSB shares the bundled DeepSeek mark.
+  const iconAgent = agent === 'dsb' ? 'dsh' : agent
+  const bundledFaviconUrl = AGENT_FAVICON_ASSETS[iconAgent]
   // Why: one resolved src for guard + attribute so empty `iconUrl` cannot pass
   // a truthy `||` check while `??` still renders a broken `<img src="">`.
   const iconSrc = catalogEntry?.iconUrl ?? bundledFaviconUrl