diff --git a/package-lock.json b/package-lock.json
index 9358015..e3e2b65 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -13,7 +13,7 @@
         "dotenv": "^16.4.5"
       },
       "devDependencies": {
-        "@types/node": "^22.10.5",
+        "@types/node": "^22.19.10",
         "typescript": "^5.7.2"
       }
     },
@@ -70,9 +70,9 @@
       }
     },
     "node_modules/@types/node": {
-      "version": "22.19.7",
-      "resolved": "https://registry.npmjs.org/@types/node/-/node-22.19.7.tgz",
-      "integrity": "sha512-MciR4AKGHWl7xwxkBa6xUGxQJ4VBOmPTF7sL+iGzuahOFaO0jHCsuEfS80pan1ef4gWId1oWOweIhrDEYLuaOw==",
+      "version": "22.19.10",
+      "resolved": "https://registry.npmjs.org/@types/node/-/node-22.19.10.tgz",
+      "integrity": "sha512-tF5VOugLS/EuDlTBijk0MqABfP8UxgYazTLo3uIn3b4yJgg26QRbVYJYsDtHrjdDUIRfP70+VfhTTc+CE1yskw==",
       "dev": true,
       "license": "MIT",
       "dependencies": {
@@ -396,6 +396,7 @@
       "resolved": "https://registry.npmjs.org/express/-/express-5.2.1.tgz",
       "integrity": "sha512-hIS4idWWai69NezIdRt2xFVofaF4j+6INOpJlVOLDO8zXGpUVEVzIYk12UUi2JzjEzWL3IOAxcTubgz9Po0yXw==",
       "license": "MIT",
+      "peer": true,
       "dependencies": {
         "accepts": "^2.0.0",
         "body-parser": "^2.2.1",
@@ -600,6 +601,7 @@
       "resolved": "https://registry.npmjs.org/hono/-/hono-4.11.7.tgz",
       "integrity": "sha512-l7qMiNee7t82bH3SeyUCt9UF15EVmaBvsppY2zQtrbIhl/yzBTny+YUxsVjSjQ6gaqaeVtZmGocom8TzBlA4Yw==",
       "license": "MIT",
+      "peer": true,
       "engines": {
         "node": ">=16.9.0"
       }
@@ -1170,6 +1172,7 @@
       "resolved": "https://registry.npmjs.org/zod/-/zod-4.3.6.tgz",
       "integrity": "sha512-rftlrkhHZOcjDwkGlnUtZZkvaPHCsDATp4pGpuOOMDaTdDDXF91wuVDJoWoPsKX/3YPQ5fHuF3STjcYyKr+Qhg==",
       "license": "MIT",
+      "peer": true,
       "funding": {
         "url": "https://github.com/sponsors/colinhacks"
       }
diff --git a/package.json b/package.json
index 3c3c64a..b863026 100644
--- a/package.json
+++ b/package.json
@@ -27,7 +27,7 @@
     "dotenv": "^16.4.5"
   },
   "devDependencies": {
-    "@types/node": "^22.10.5",
+    "@types/node": "^22.19.10",
     "typescript": "^5.7.2"
   }
 }
diff --git a/src/services/agent.ts b/src/services/agent.ts
index de10ae7..b1c8ea9 100644
--- a/src/services/agent.ts
+++ b/src/services/agent.ts
@@ -91,10 +91,11 @@ export class AutonomousAgent {
 
       console.log(`\n📬 [${new Date().toLocaleTimeString()}] Found ${newMentions.length} new mention(s)!\n`);
 
-      // Process each mention
-      for (const mention of newMentions) {
-        await this.processMention(mention);
-        this.processedMentions.add(mention.post.id);
+      // Process each mention in reverse (oldest first) to maintain chronological Set insertion order
+      // X API returns mentions newest-first, so we reverse to process oldest→newest
+      for (let i = newMentions.length - 1; i >= 0; i--) {
+        await this.processMention(newMentions[i]);
+        this.processedMentions.add(newMentions[i].post.id);
       }
 
       // Prune oldest entries to prevent unbounded memory growth
diff --git a/src/services/xapi.ts b/src/services/xapi.ts
index ab6c4b5..3507c24 100644
--- a/src/services/xapi.ts
+++ b/src/services/xapi.ts
@@ -91,6 +91,11 @@ export class XAPIClient {
         return null;
       }
 
+      if (!Array.isArray(response.data)) {
+        console.warn('Unexpected response shape from X API (thread): data is not an array');
+        return null;
+      }
+
       return this.parseThread(response.data);
     } catch (error) {
       console.error('Error fetching thread:', error);