fix(OpenCode 呼叫): 降低並行請求並重試暫時性錯誤

app/test/llm.test.js

@@ -4,7 +4,7 @@ import axios from 'axios';
 import { extractBalancedJSON, extractJSONText } from '../llm.js';
 
 const ENV_KEYS = [
-  'OPENCODE_BASE_URL', 'OPENCODE_MODEL', 'OPENCODE_PROVIDER',
+  'OPENCODE_BASE_URL', 'OPENCODE_MODEL', 'OPENCODE_PROVIDER', 'OPENCODE_RETRY_ATTEMPTS',
 ];
 
 let saved = {};
@@ -87,6 +87,7 @@ describe('chat - OpenCode', async () => {
 
   it('throws an error when OpenCode fails instead of exiting the process', async () => {
     process.env.OPENCODE_BASE_URL = 'http://opencode.local:4096';
+    process.env.OPENCODE_RETRY_ATTEMPTS = '1';
     mock.method(axios, 'post', async () => {
       const err = new Error('Request failed with status code 500');
       err.response = { status: 500, data: { error: 'provider overloaded' } };
@@ -98,6 +99,27 @@ describe('chat - OpenCode', async () => {
 
     assert.equal(exitMock.mock.calls.length, 0);
   });
+
+  it('retries transient OpenCode failures before returning content', async () => {
+    process.env.OPENCODE_BASE_URL = 'http://opencode.local:4096';
+    process.env.OPENCODE_RETRY_ATTEMPTS = '2';
+    let messageAttempts = 0;
+    mock.method(axios, 'post', async (url) => {
+      if (url.endsWith('/session')) return { data: { id: 'ses_test' } };
+      messageAttempts += 1;
+      if (messageAttempts === 1) {
+        const err = new Error('Request failed with status code 500');
+        err.response = { status: 500, data: { error: 'temporary failure' } };
+        throw err;
+      }
+      return { data: { parts: [{ type: 'text', text: 'ok after retry' }] } };
+    });
+
+    const result = await chat('sys', 'user');
+
+    assert.equal(result, 'ok after retry');
+    assert.equal(messageAttempts, 2);
+  });
 });
 
 describe('chatJSON', async () => {