Responses context update.

_opt/responses.js

@@ -272,12 +272,29 @@ async function onMessage(client, cfg, message) {
           client.logger.error(`Error checking score: ${err.message}`);
         }
       }
-      // Build request body, prefixing with a mention of who spoke
+      // Build request body, including replied-to message context and mention of who spoke
+      let referencePrefix = '';
+      if (message.reference?.messageId) {
+        try {
+          const ref = await message.channel.messages.fetch(message.reference.messageId);
+          const refContent = ref.content || '';
+          if (ref.author.id === botId) {
+            referencePrefix = `You said: ${refContent}`;
+          } else {
+            referencePrefix = `<@${ref.author.id}> said: ${refContent}`;
+          }
+        } catch {
+          // ignore fetch errors
+        }
+      }
       const speakerMention = `<@${message.author.id}>`;
+      const userInput = referencePrefix
+        ? `${referencePrefix}\n${speakerMention} said to you: ${message.content}`
+        : `${speakerMention} said to you: ${message.content}`;
       const body = {
         model: cfg.defaultModel,
         instructions: client.responsesPrompt,
-        input: `${speakerMention} said to you: ${message.content}`,
+        input: userInput,
         previous_response_id: prev,
         max_output_tokens: cfg.defaultMaxTokens,
         temperature: cfg.defaultTemperature,