feat: Enhance LLM robustness with improved error handling and model resolution

src/llm.ts

@@ -111,7 +111,17 @@ export async function analyzeProducts(
       }
       return fallback;
     }
-    throw err;
+
+    const errorReason = formatErrorReason(err);
+    console.warn(
+      `LLM request failed for ${products.length} product(s): ${errorReason}`,
+    );
+    return products.map((product) => ({
+      asin: product.record.asin,
+      verdict: "SKIP" as const,
+      confidence: 0,
+      reasoning: `LLM analysis failed: ${errorReason}`,
+    }));
   }
 }
 
@@ -195,6 +205,10 @@ async function requestClaudeContent(
     );
   }
 
+  const model = resolveAnthropicModel(
+    config.anthropicModel ?? "claude-sonnet-4-6",
+  );
+
   const res = await fetch("https://api.anthropic.com/v1/messages", {
     method: "POST",
     headers: {
@@ -203,7 +217,7 @@ async function requestClaudeContent(
       "anthropic-version": "2023-06-01",
     },
     body: JSON.stringify({
-      model: config.anthropicModel,
+      model,
       system: systemPrompt,
       messages: [
         { role: "user", content: JSON.stringify(productSummaries, null, 2) },
@@ -230,6 +244,31 @@ async function requestClaudeContent(
     .join("\n");
 }
 
+function resolveAnthropicModel(rawModel: string): string {
+  const normalized = rawModel.trim().toLowerCase();
+  const aliases: Record<string, string> = {
+    "claude-4-6-sonnet": "claude-sonnet-4-6",
+    "claude-4-6-haiku": "claude-haiku-4-5",
+    "claude-4-7-opus": "claude-opus-4-7",
+  };
+
+  const mapped = aliases[normalized];
+  if (mapped && mapped !== rawModel) {
+    console.warn(
+      `ANTHROPIC_MODEL '${rawModel}' is not an official API ID. Using '${mapped}' instead.`,
+    );
+    return mapped;
+  }
+
+  return rawModel;
+}
+
+function formatErrorReason(err: unknown): string {
+  const message = String(err).replace(/\s+/g, " ").trim();
+  if (!message) return "Unknown LLM error";
+  return message.length > 140 ? `${message.slice(0, 137)}...` : message;
+}
+
 async function readErrorBody(response: Response): Promise<string> {
   const text = await response.text();
   if (!text.trim()) return "No response body";