diff --git a/AGENTS.md b/AGENTS.md
new file mode 100644
index 0000000..e178ec6
--- /dev/null
+++ b/AGENTS.md
@@ -0,0 +1,15 @@
+# Agent Guide
+
+Before answering any question that involves facts about ANYTHING, you MUST output at least one Read, WebFetch, or WebSearch tool call.
+If your first output is text instead of a tool call, you have failed.
+
+## Commands
+
+ALWAYS use the `npm run *` command
+
+| Command            | What it does                          |
+| ------------------ | ------------------------------------- |
+| `npm run dev`      | Hot-reload dev server (nodemon + tsx) |
+| `npm start`        | Run compiled `dist/index.js`          |
+| `npm run lint`     | ESLint on `src/`                      |
+| `npm run prettier` | ALWAYS RUN AFTER EDITING FILES        |
diff --git a/package.json b/package.json
index d31757c..9e703b9 100644
--- a/package.json
+++ b/package.json
@@ -6,7 +6,7 @@
   "scripts": {
     "dev": "npx nodemon src/app.js",
     "lint": "npx eslint src",
-    "lint:report": "npm run lint -- --output-file eslint_report.json --format json",
+    "prettier:": "npm run prettier:write",
     "prettier:check": "npx prettier --check .",
     "prettier:write": "npx prettier --write .",
     "start": "node src/app.js"
diff --git a/src/api.js b/src/api.js
index 55e8792..18af9f2 100644
--- a/src/api.js
+++ b/src/api.js
@@ -82,31 +82,35 @@ export class GHCRApi {
     const indexManifest = await this.getManifest(tag)
     debug('mediaType:', indexManifest.mediaType)
 
-    let totalSize = 0
-
     if (
       !indexManifest.mediaType.includes('list') &&
       !indexManifest.mediaType.includes('index')
     ) {
       // debug('indexManifest - !list + !index:', indexManifest)
+      // noinspection JSUnresolvedReference
       const size = indexManifest.layers.reduce((sum, layer) => sum + layer.size, 0)
-      totalSize = size + (indexManifest.config.size || 0)
+      const totalSize = size + (indexManifest.config.size || 0)
       // debug('totalSize:', totalSize)
       await cacheSet(key, totalSize)
       return totalSize
     }
 
     debug('indexManifest.manifests?.length:', indexManifest.manifests?.length)
-    for (const m of indexManifest.manifests) {
-      await new Promise((resolve) => setTimeout(resolve, 50))
-      const manifest = await this.getManifest(m.digest)
-      const configSize = manifest.config?.size || 0
-      // debug('configSize:', configSize)
-      // noinspection JSUnresolvedReference
-      const layerSize = manifest.layers?.reduce((a, l) => a + (l.size || 0), 0) || 0
-      // debug('layerSize:', layerSize)
-      totalSize += configSize + layerSize
-    }
+    // only process linux/amd64 or first item...
+    // noinspection JSValidateTypes
+    const m =
+      indexManifest.manifests?.find(
+        (m) => m.platform?.os === 'linux' && m.platform?.architecture === 'amd64',
+      ) || indexManifest.manifests?.[0]
+    debug('indexManifest:', m)
+    await new Promise((resolve) => setTimeout(resolve, 50))
+    const manifest = await this.getManifest(m.digest)
+    const configSize = manifest.config?.size || 0
+    // debug('configSize:', configSize)
+    // noinspection JSUnresolvedReference
+    const layerSize = manifest.layers?.reduce((a, l) => a + (l.size || 0), 0) || 0
+    // debug('layerSize:', layerSize)
+    const totalSize = configSize + layerSize
     // debug('totalSize:', totalSize)
     await cacheSet(key, totalSize, 60 * 60 * 4)
     return totalSize