diff --git a/src/agents/pi-embedded-helpers/errors.ts b/src/agents/pi-embedded-helpers/errors.ts
index 4cf347150bf..69203328c5e 100644
--- a/src/agents/pi-embedded-helpers/errors.ts
+++ b/src/agents/pi-embedded-helpers/errors.ts
@@ -1,5 +1,6 @@
 import type { AssistantMessage } from "@mariozechner/pi-ai";
 import type { OpenClawConfig } from "../../config/config.js";
+import type { FailoverReason } from "./types.js";
 import { createSubsystemLogger } from "../../logging/subsystem.js";
 import { formatSandboxToolPolicyBlockedMessage } from "../sandbox.js";
 import { stableStringify } from "../stable-stringify.js";
@@ -13,7 +14,6 @@ import {
   isTimeoutErrorMessage,
   matchesFormatErrorPattern,
 } from "./failover-matches.js";
-import type { FailoverReason } from "./types.js";
 
 export {
   isAuthErrorMessage,
@@ -189,7 +189,7 @@ const HTTP_STATUS_PREFIX_RE = /^(?:http\s*)?(\d{3})\s+(.+)$/i;
 const HTTP_STATUS_CODE_PREFIX_RE = /^(?:http\s*)?(\d{3})(?:\s+([\s\S]+))?$/i;
 const HTML_ERROR_PREFIX_RE = /^\s*(?:<!doctype\s+html\b|<html\b)/i;
 const CLOUDFLARE_HTML_ERROR_CODES = new Set([521, 522, 523, 524, 525, 526, 530]);
-const TRANSIENT_HTTP_ERROR_CODES = new Set([500, 502, 503, 504, 521, 522, 523, 524, 529]);
+const TRANSIENT_HTTP_ERROR_CODES = new Set([499, 500, 502, 503, 504, 521, 522, 523, 524, 529]);
 const HTTP_ERROR_HINTS = [
   "error",
   "bad request",