Improve plugin-side API error observability for generation

modules/streaming-generation.js

@@ -287,10 +287,14 @@ class StreamingGeneration {
             const logSendRequestError = (err, streamMode) => {
                 if (err?.name !== 'AbortError') {
                     const safeApiUrl = String(cmdApiUrl || reverseProxy || oai_settings?.custom_url || '').trim();
+                    const status = this._extractHttpStatus(err);
+                    const isRateLimit = status === 429;
                     try {
                         xbLog.error('streamingGeneration', 'sendRequest failed', {
                             message: err?.message || String(err),
                             name: err?.name,
+                            status,
+                            isRateLimit,
                             stream: !!streamMode,
                             api: String(opts.api || ''),
                             model,
@@ -299,6 +303,12 @@ class StreamingGeneration {
                         });
                     } catch {}
                     console.error('[xbgen:callAPI] sendRequest failed:', err);
+                    if (status) {
+                        console.error(`[xbgen:callAPI] HTTP status=${status} stream=${!!streamMode} api=${String(opts.api || '')} model=${model}`);
+                    }
+                    if (isRateLimit) {
+                        console.error('[xbgen:callAPI] Rate limited (429). Check provider RPM/TPM and concurrent requests.');
+                    }
                 }
             };
 
@@ -465,6 +475,14 @@ class StreamingGeneration {
                 return String(session.text || '');
             }
 
+            const httpStatus = this._extractHttpStatus(err);
+            if (!err?.error && httpStatus) {
+                err.error = {
+                    code: String(httpStatus),
+                    message: String(err?.message || `HTTP ${httpStatus}`),
+                };
+            }
+
             console.error('[StreamingGeneration] Generation error:', err);
             console.error('[StreamingGeneration] error.error =', err?.error);
             try { xbLog.error('streamingGeneration', `processGeneration error sid=${session.id}`, err); } catch {}
@@ -812,6 +830,18 @@ class StreamingGeneration {
         return true;
     }
 
+    _extractHttpStatus(err) {
+        const direct = Number(err?.status || err?.statusCode || err?.response?.status);
+        if (Number.isFinite(direct) && direct >= 100 && direct <= 599) return direct;
+        const msg = String(err?.message || '');
+        const m = msg.match(/\bstatus\s+(\d{3})\b/i);
+        if (m) {
+            const s = Number(m[1]);
+            if (Number.isFinite(s)) return s;
+        }
+        return null;
+    }
+
     _getLastMessagesSnapshot() {
         const ctx = getContext();
         const list = Array.isArray(ctx?.chat) ? ctx.chat : [];