diff --git a/.github/workflows/auto-close-duplicates.yml b/.github/workflows/auto-close-duplicates.yml
index bd48a3d6..12ed1be5 100644
--- a/.github/workflows/auto-close-duplicates.yml
+++ b/.github/workflows/auto-close-duplicates.yml
@@ -2,7 +2,8 @@ name: Auto-close duplicate issues (DRY RUN)
 description: Dry run - logs issues that would be auto-closed as duplicates after 3 days if no response
 on:
   schedule:
-    - cron: '0 9 * * *'
+    - cron: "0 9 * * *"
+  workflow_dispatch:
 
 jobs:
   auto-close-duplicates:
@@ -10,69 +11,20 @@ jobs:
     timeout-minutes: 10
     permissions:
       contents: read
-      issues: write
+      issues: read
 
     steps:
-      - name: Auto-close duplicate issues
-        uses: actions/github-script@v7
+      - name: Checkout repository
+        uses: actions/checkout@v4
+      
+      - name: Setup Bun
+        uses: oven-sh/setup-bun@v2
         with:
-          script: |
-            const threeDaysAgo = new Date();
-            threeDaysAgo.setDate(threeDaysAgo.getDate() - 3);
-            
-            // Get all open issues
-            const { data: issues } = await github.rest.issues.listForRepo({
-              owner: context.repo.owner,
-              repo: context.repo.repo,
-              state: 'open',
-              per_page: 100
-            });
-            
-            for (const issue of issues) {
-              // Get comments for this issue
-              const { data: comments } = await github.rest.issues.listComments({
-                owner: context.repo.owner,
-                repo: context.repo.repo,
-                issue_number: issue.number
-              });
-              
-              // Find duplicate comments (look for "Found 1 possible duplicate" or "Found X possible duplicate")
-              const dupeComments = comments.filter(comment => 
-                comment.body.includes('Found') && 
-                comment.body.includes('possible duplicate') &&
-                comment.user.type === 'Bot'
-              );
-              
-              if (dupeComments.length === 0) continue;
-              
-              // Get the most recent duplicate comment
-              const lastDupeComment = dupeComments[dupeComments.length - 1];
-              const dupeCommentDate = new Date(lastDupeComment.created_at);
-              
-              // Check if the duplicate comment is 3+ days old
-              if (dupeCommentDate > threeDaysAgo) continue;
-              
-              // Check if there are any comments after the duplicate comment
-              const commentsAfterDupe = comments.filter(comment => 
-                new Date(comment.created_at) > dupeCommentDate
-              );
-              
-              if (commentsAfterDupe.length > 0) continue;
-              
-              // Check if issue author reacted with thumbs down to the duplicate comment
-              const { data: reactions } = await github.rest.reactions.listForIssueComment({
-                owner: context.repo.owner,
-                repo: context.repo.repo,
-                comment_id: lastDupeComment.id
-              });
-              
-              const authorThumbsDown = reactions.some(reaction => 
-                reaction.user.id === issue.user.id && reaction.content === '-1'
-              );
-              
-              if (authorThumbsDown) continue;
-              
-              // DRY RUN: Log the issue that would be auto-closed
-              const issueUrl = `https://github.com/${context.repo.owner}/${context.repo.repo}/issues/${issue.number}`;
-              console.log(`[DRY RUN] Would auto-close issue #${issue.number} as duplicate: ${issueUrl}`);
-            }
\ No newline at end of file
+          bun-version: latest
+      
+      - name: Auto-close duplicate issues
+        run: bun run scripts/auto-close-duplicates.ts
+        env:
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+          GITHUB_REPOSITORY_OWNER: ${{ github.repository_owner }}
+          GITHUB_REPOSITORY_NAME: ${{ github.event.repository.name }}
diff --git a/scripts/auto-close-duplicates.ts b/scripts/auto-close-duplicates.ts
new file mode 100644
index 00000000..9985ba8c
--- /dev/null
+++ b/scripts/auto-close-duplicates.ts
@@ -0,0 +1,183 @@
+#!/usr/bin/env bun
+
+declare global {
+  var process: {
+    env: Record<string, string | undefined>;
+  };
+}
+
+interface GitHubIssue {
+  number: number;
+  title: string;
+  user: { id: number };
+}
+
+interface GitHubComment {
+  id: number;
+  body: string;
+  created_at: string;
+  user: { type: string; id: number };
+}
+
+interface GitHubReaction {
+  user: { id: number };
+  content: string;
+}
+
+async function githubRequest<T>(endpoint: string, token: string): Promise<T> {
+  const response = await fetch(`https://api.github.com${endpoint}`, {
+    headers: {
+      Authorization: `Bearer ${token}`,
+      Accept: "application/vnd.github.v3+json",
+      "User-Agent": "auto-close-duplicates-script",
+    },
+  });
+
+  if (!response.ok) {
+    throw new Error(
+      `GitHub API request failed: ${response.status} ${response.statusText}`
+    );
+  }
+
+  return response.json();
+}
+
+async function autoCloseDuplicates(): Promise<void> {
+  console.log("[DEBUG] Starting auto-close duplicates script");
+
+  const token = process.env.GITHUB_TOKEN;
+  if (!token) {
+    throw new Error("GITHUB_TOKEN environment variable is required");
+  }
+  console.log("[DEBUG] GitHub token found");
+
+  const owner = process.env.GITHUB_REPOSITORY_OWNER || "anthropics";
+  const repo = process.env.GITHUB_REPOSITORY_NAME || "claude-code";
+  console.log(`[DEBUG] Repository: ${owner}/${repo}`);
+
+  const threeDaysAgo = new Date();
+  threeDaysAgo.setDate(threeDaysAgo.getDate() - 3);
+  console.log(
+    `[DEBUG] Checking for duplicate comments older than: ${threeDaysAgo.toISOString()}`
+  );
+
+  console.log("[DEBUG] Fetching open issues...");
+  const issues: GitHubIssue[] = await githubRequest(
+    `/repos/${owner}/${repo}/issues?state=open&per_page=100`,
+    token
+  );
+  console.log(`[DEBUG] Found ${issues.length} open issues`);
+
+  let processedCount = 0;
+  let candidateCount = 0;
+
+  for (const issue of issues) {
+    processedCount++;
+    console.log(
+      `[DEBUG] Processing issue #${issue.number} (${processedCount}/${issues.length}): ${issue.title}`
+    );
+
+    console.log(`[DEBUG] Fetching comments for issue #${issue.number}...`);
+    const comments: GitHubComment[] = await githubRequest(
+      `/repos/${owner}/${repo}/issues/${issue.number}/comments`,
+      token
+    );
+    console.log(
+      `[DEBUG] Issue #${issue.number} has ${comments.length} comments`
+    );
+
+    const dupeComments = comments.filter(
+      (comment) =>
+        comment.body.includes("Found") &&
+        comment.body.includes("possible duplicate") &&
+        comment.user.type === "Bot"
+    );
+    console.log(
+      `[DEBUG] Issue #${issue.number} has ${dupeComments.length} duplicate detection comments`
+    );
+
+    if (dupeComments.length === 0) {
+      console.log(
+        `[DEBUG] Issue #${issue.number} - no duplicate comments found, skipping`
+      );
+      continue;
+    }
+
+    const lastDupeComment = dupeComments[dupeComments.length - 1];
+    const dupeCommentDate = new Date(lastDupeComment.created_at);
+    console.log(
+      `[DEBUG] Issue #${
+        issue.number
+      } - most recent duplicate comment from: ${dupeCommentDate.toISOString()}`
+    );
+
+    if (dupeCommentDate > threeDaysAgo) {
+      console.log(
+        `[DEBUG] Issue #${issue.number} - duplicate comment is too recent, skipping`
+      );
+      continue;
+    }
+    console.log(
+      `[DEBUG] Issue #${
+        issue.number
+      } - duplicate comment is old enough (${Math.floor(
+        (Date.now() - dupeCommentDate.getTime()) / (1000 * 60 * 60 * 24)
+      )} days)`
+    );
+
+    const commentsAfterDupe = comments.filter(
+      (comment) => new Date(comment.created_at) > dupeCommentDate
+    );
+    console.log(
+      `[DEBUG] Issue #${issue.number} - ${commentsAfterDupe.length} comments after duplicate detection`
+    );
+
+    if (commentsAfterDupe.length > 0) {
+      console.log(
+        `[DEBUG] Issue #${issue.number} - has activity after duplicate comment, skipping`
+      );
+      continue;
+    }
+
+    console.log(
+      `[DEBUG] Issue #${issue.number} - checking reactions on duplicate comment...`
+    );
+    const reactions: GitHubReaction[] = await githubRequest(
+      `/repos/${owner}/${repo}/issues/comments/${lastDupeComment.id}/reactions`,
+      token
+    );
+    console.log(
+      `[DEBUG] Issue #${issue.number} - duplicate comment has ${reactions.length} reactions`
+    );
+
+    const authorThumbsDown = reactions.some(
+      (reaction) =>
+        reaction.user.id === issue.user.id && reaction.content === "-1"
+    );
+    console.log(
+      `[DEBUG] Issue #${issue.number} - author thumbs down reaction: ${authorThumbsDown}`
+    );
+
+    if (authorThumbsDown) {
+      console.log(
+        `[DEBUG] Issue #${issue.number} - author disagreed with duplicate detection, skipping`
+      );
+      continue;
+    }
+
+    candidateCount++;
+    const issueUrl = `https://github.com/${owner}/${repo}/issues/${issue.number}`;
+    console.log(
+      `[DRY RUN] Would auto-close issue #${issue.number} as duplicate: ${issueUrl}`
+    );
+  }
+
+  console.log(
+    `[DEBUG] Script completed. Processed ${processedCount} issues, found ${candidateCount} candidates for auto-close`
+  );
+}
+
+autoCloseDuplicates().catch(console.error);
+
+// Make it a module
+export {};