diff --git a/.github/workflows/deploy.yml b/.github/workflows/deploy.yml
new file mode 100644
index 0000000..a6e5f6b
--- /dev/null
+++ b/.github/workflows/deploy.yml
@@ -0,0 +1,35 @@
+name: Generate and Deploy Index
+
+on:
+  push:
+    branches:
+      - main
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+
+    steps:
+    - name: Checkout repository
+      uses: actions/checkout@v2
+
+    - name: Set up Python
+      uses: actions/setup-python@v2
+      with:
+        python-version: '3.12'
+
+    - name: Generate index.json
+      run: ./script/deploy
+
+    - name: Checkout deployment branch
+      run: |
+        git fetch
+        git checkout --orphan deployment
+        git reset --hard
+        git clean -fdx
+        git checkout main -- index.json
+        git add index.json
+        git commit -m 'Auto-generate index.json'
+        git push --force origin deployment
+      env:
+        GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
diff --git a/script/deploy b/script/deploy
new file mode 100755
index 0000000..cffe602
--- /dev/null
+++ b/script/deploy
@@ -0,0 +1,49 @@
+#!/usr/bin/env python3
+
+import json
+import os
+
+
+def get_file_size(file_path):
+    return os.path.getsize(file_path)
+
+
+def generate_index(directory, output_file, base_url):
+    index = {
+        "type": "dir",
+        "size": 0,
+        "name": directory,
+        "path": directory,
+        "download_url": f"{base_url}/{output_file}",
+        "_links": {
+            "self": f"{base_url}/{output_file}",
+        },
+        "entries": [],
+    }
+
+    for root, dirs, files in os.walk(directory):
+        for file in files:
+            if file.endswith(".yaml"):
+                file_path = os.path.join(root, file)
+                relative_path = file_path.replace("\\", "/")
+                file_info = {
+                    "type": "file",
+                    "size": get_file_size(file_path),
+                    "name": file,
+                    "path": relative_path,
+                    "download_url": f"{base_url}/{relative_path}",
+                    "_links": {
+                        "self": f"{base_url}/{relative_path}",
+                    },
+                }
+                index["entries"].append(file_info)
+
+    with open(output_file, "w") as f:
+        json.dump(index, f, indent=4)
+
+
+BASE_URL = "https://minbzk.github.io/instrument-registry"
+DIRECTORY = "instruments"
+OUTPUT_FILE = "index.json"
+
+generate_index(DIRECTORY, OUTPUT_FILE, BASE_URL)