fix: ensure the alibaba provider errors are retried (#21355)

packages/opencode/src/session/retry.ts

@@ -58,6 +58,19 @@ export namespace SessionRetry {
       return error.data.message.includes("Overloaded") ? "Provider is overloaded" : error.data.message
     }
 
+    // Check for rate limit patterns in plain text error messages
+    const msg = error.data?.message
+    if (typeof msg === "string") {
+      const lower = msg.toLowerCase()
+      if (
+        lower.includes("rate increased too quickly") ||
+        lower.includes("rate limit") ||
+        lower.includes("too many requests")
+      ) {
+        return msg
+      }
+    }
+
     const json = iife(() => {
       try {
         if (typeof error.data?.message === "string") {

packages/opencode/test/session/retry.test.ts

@@ -145,6 +145,25 @@ describe("session.retry.retryable", () => {
     expect(SessionRetry.retryable(error)).toBeUndefined()
   })
 
+  test("retries plain text rate limit errors from Alibaba", () => {
+    const msg =
+      "Upstream error from Alibaba: Request rate increased too quickly. To ensure system stability, please adjust your client logic to scale requests more smoothly over time."
+    const error = wrap(msg)
+    expect(SessionRetry.retryable(error)).toBe(msg)
+  })
+
+  test("retries plain text rate limit errors", () => {
+    const msg = "Rate limit exceeded, please try again later"
+    const error = wrap(msg)
+    expect(SessionRetry.retryable(error)).toBe(msg)
+  })
+
+  test("retries too many requests in plain text", () => {
+    const msg = "Too many requests, please slow down"
+    const error = wrap(msg)
+    expect(SessionRetry.retryable(error)).toBe(msg)
+  })
+
   test("does not retry context overflow errors", () => {
     const error = new MessageV2.ContextOverflowError({
       message: "Input exceeds context window of this model",