diff --git a/Anthropic 1P/00_Tutorial_How-To.ipynb b/Anthropic 1P/00_Tutorial_How-To.ipynb
index befac63..d125abe 100644
--- a/Anthropic 1P/00_Tutorial_How-To.ipynb	
+++ b/Anthropic 1P/00_Tutorial_How-To.ipynb	
@@ -44,7 +44,7 @@
    "outputs": [],
    "source": [
     "API_KEY = \"your_api_key_here\"\n",
-    "MODEL_NAME = \"claude-3-haiku-20240307\"\n",
+    "MODEL_NAME = \"claude-3-5-haiku-latest\"\n",
     "\n",
     "# Stores the API_KEY & MODEL_NAME variables for use across notebooks within the IPython store\n",
     "%store API_KEY\n",
diff --git a/Anthropic 1P/10.2_Appendix_Tool Use.ipynb b/Anthropic 1P/10.2_Appendix_Tool Use.ipynb
index fb632a0..65fb43b 100644
--- a/Anthropic 1P/10.2_Appendix_Tool Use.ipynb	
+++ b/Anthropic 1P/10.2_Appendix_Tool Use.ipynb	
@@ -32,10 +32,13 @@
     "\n",
     "client = anthropic.Anthropic(api_key=API_KEY)\n",
     "\n",
-    "# Rewrittten to call Claude 3 Sonnet, which is generally better at tool use, and include stop_sequences\n",
+    "# Use the rolling Sonnet alias so the tool-use appendix keeps working after dated snapshots are retired.\n",
+    "%store -r MODEL_NAME\n",
+    "TOOL_USE_MODEL = MODEL_NAME if MODEL_NAME and \"sonnet\" in MODEL_NAME else \"claude-3-5-sonnet-latest\"\n",
+    "\n",
     "def get_completion(messages, system_prompt=\"\", prefill=\"\",stop_sequences=None):\n",
     "    message = client.messages.create(\n",
-    "        model=\"claude-3-sonnet-20240229\",\n",
+    "        model=TOOL_USE_MODEL,\n",
     "        max_tokens=2000,\n",
     "        temperature=0.0,\n",
     "        system=system_prompt,\n",
diff --git a/scripts/check_deprecated_anthropic_models.py b/scripts/check_deprecated_anthropic_models.py
new file mode 100644
index 0000000..1edc715
--- /dev/null
+++ b/scripts/check_deprecated_anthropic_models.py
@@ -0,0 +1,28 @@
+#!/usr/bin/env python3
+from pathlib import Path
+import json
+import sys
+
+BLOCKED_MODELS = {
+    "claude-3-haiku-20240307",
+    "claude-3-sonnet-20240229",
+    "claude-3-opus-20240229",
+}
+
+paths = sorted(Path("Anthropic 1P").glob("*.ipynb"))
+violations = []
+for path in paths:
+    nb = json.loads(path.read_text())
+    for cell_index, cell in enumerate(nb.get("cells", []), start=1):
+        if cell.get("cell_type") != "code":
+            continue
+        source = "".join(cell.get("source", []))
+        for model in BLOCKED_MODELS:
+            if model in source:
+                violations.append(f"{path}: cell {cell_index} still references deprecated model {model}")
+
+if violations:
+    print("\n".join(violations))
+    sys.exit(1)
+
+print(f"checked {len(paths)} notebooks, no deprecated direct Anthropic model snapshots found")