diff --git a/.github/workflows/diagnose-message-shape.yml b/.github/workflows/diagnose-message-shape.yml
new file mode 100644
index 0000000..db118c2
--- /dev/null
+++ b/.github/workflows/diagnose-message-shape.yml
@@ -0,0 +1,20 @@
+name: Diagnose message shape
+
+on:
+  workflow_dispatch:
+
+jobs:
+  diagnose:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+      - uses: actions/setup-node@v4
+        with:
+          node-version: "20"
+      - run: npm install
+      - name: Diagnose
+        env:
+          CRISP_USER_REGISTRATION_IDENTIFIER: ${{ secrets.CRISP_USER_REGISTRATION_IDENTIFIER }}
+          CRISP_USER_REGISTRATION_KEY: ${{ secrets.CRISP_USER_REGISTRATION_KEY }}
+          CRISP_USER_REGISTRATION_WEBSITE_ID: ${{ vars.CRISP_USER_REGISTRATION_WEBSITE_ID }}
+        run: node scripts/diagnose-message-shape.mjs
diff --git a/scripts/diagnose-message-shape.mjs b/scripts/diagnose-message-shape.mjs
new file mode 100644
index 0000000..0da83d3
--- /dev/null
+++ b/scripts/diagnose-message-shape.mjs
@@ -0,0 +1,14 @@
+#!/usr/bin/env node
+import { fetchRawMessages, credsForAccount, fetchResolvedConversationsSince } from "./crisp-client.mjs";
+
+const creds = credsForAccount("USER_REGISTRATION");
+const since = new Date(Date.now() - 30 * 24 * 60 * 60 * 1000).toISOString();
+const conversations = await fetchResolvedConversationsSince(creds, since);
+console.log(`found ${conversations.length} resolved conversations`);
+if (conversations.length > 0) {
+  const messages = await fetchRawMessages(creds, conversations[0].session_id);
+  console.log(JSON.stringify(messages[0], null, 2));
+  console.log("--- conversation object keys ---");
+  console.log(JSON.stringify(Object.keys(conversations[0])));
+  console.log(JSON.stringify(conversations[0], null, 2));
+}