fix: improve provider routing and assignments

open-sse/handlers/chatCore.js

@@ -309,8 +309,29 @@ export async function handleChatCore({ body, modelInfo, credentials, log, onCred
     proxyPoolId: psd?.proxyPoolId || psd?.connectionProxyPoolId || null,
   });
 
+  const proxyScope = `${provider}::${model}`;
   let proxyOptions = buildProxyOptions(credentials?.providerSpecificData || {});
 
+  if (provider === "freebuff" && credentials?.providerSpecificData?.noFitPool === true) {
+    const error = new Error(`Freebuff has no healthy proxy pool for ${model}; all assigned pools are cooling down after limited-IP errors.`);
+    error.status = 503;
+    error.poolScoped = { poolId: null, scope: proxyScope, reason: "no_fit_pool" };
+    trackPendingRequest(model, provider, connectionId, false, true);
+    return createErrorResult(503, error.message);
+  }
+
+  if (
+    provider === "freebuff" &&
+    !proxyOptions.proxyPoolId &&
+    !proxyOptions.vercelRelayUrl &&
+    !(proxyOptions.connectionProxyEnabled && proxyOptions.connectionProxyUrl)
+  ) {
+    const error = new Error(`Freebuff requires a configured proxy pool for ${model}; direct egress is disabled to prevent limited-IP rate limits.`);
+    error.status = 503;
+    trackPendingRequest(model, provider, connectionId, false, true);
+    return createErrorResult(503, error.message);
+  }
+
   if (proxyOptions.vercelRelayUrl) {
     const connectionName = credentials?.connectionName || credentials?.connectionId || "unknown";
     const poolId = proxyOptions.proxyPoolId || "none";
@@ -342,7 +363,6 @@ export async function handleChatCore({ body, modelInfo, credentials, log, onCred
   // another pool instead of failing the account. Covers both thrown errors
   // (executor.execute) and non-ok responses declared poolScoped via
   // parseError — poolId/scope are completed here from proxyOptions.
-  const proxyScope = `${provider}::${model}`;
   let parsedNonOk = null;
 
   const tryNextPool = async (poolScoped, reasonMsg) => {