diff --git a/apps/server/src/codexAppServerManager.test.ts b/apps/server/src/codexAppServerManager.test.ts
index 044a0fd1..2b5b9f7f 100644
--- a/apps/server/src/codexAppServerManager.test.ts
+++ b/apps/server/src/codexAppServerManager.test.ts
@@ -193,6 +193,12 @@ describe("classifyCodexStderrLine", () => {
     expect(classifyCodexStderrLine(line)).toBeNull();
   });
 
+  it("ignores known unauthenticated supabase mcp transport shutdown noise", () => {
+    const line =
+      '2026-04-07T11:04:55.822542Z ERROR rmcp::transport::worker: worker quit with fatal: Transport channel closed, when AuthRequired(AuthRequiredError { www_authenticate_header: "Bearer error=\\"invalid_request\\", error_description=\\"No access token was provided in this request\\", resource_metadata=\\"https://mcp.supabase.com/.well-known/oauth-protected-resource/mcp\\"" })';
+    expect(classifyCodexStderrLine(line)).toBeNull();
+  });
+
   it("keeps unknown structured errors", () => {
     const line = "2026-02-08T04:24:20.085687Z ERROR codex_core::runtime: unrecoverable failure";
     expect(classifyCodexStderrLine(line)).toEqual({
diff --git a/apps/server/src/codexAppServerManager.ts b/apps/server/src/codexAppServerManager.ts
index ef3e55fa..d3c74866 100644
--- a/apps/server/src/codexAppServerManager.ts
+++ b/apps/server/src/codexAppServerManager.ts
@@ -161,6 +161,9 @@ const BENIGN_ERROR_LOG_SNIPPETS = [
   "state db missing rollout path for thread",
   "state db record_discrepancy: find_thread_path_by_id_str_in_subdir, falling_back",
 ];
+const BENIGN_STDERR_MESSAGE_SNIPPETS = [
+  'worker quit with fatal: Transport channel closed, when AuthRequired(AuthRequiredError { www_authenticate_header: "Bearer error=\\"invalid_request\\", error_description=\\"No access token was provided in this request\\", resource_metadata=\\"https://mcp.supabase.com/.well-known/oauth-protected-resource/mcp\\""',
+];
 const RECOVERABLE_THREAD_RESUME_ERROR_SNIPPETS = [
   "not found",
   "missing thread",
@@ -518,6 +521,11 @@ export function classifyCodexStderrLine(rawLine: string): { message: string } |
     return null;
   }
 
+  const isBenignMessage = BENIGN_STDERR_MESSAGE_SNIPPETS.some((snippet) => line.includes(snippet));
+  if (isBenignMessage) {
+    return null;
+  }
+
   const match = line.match(CODEX_STDERR_LOG_REGEX);
   if (match) {
     const level = match[1];