diff --git a/nanobot/utils/helpers.py b/nanobot/utils/helpers.py
index ae008bec..0afe193c 100644
--- a/nanobot/utils/helpers.py
+++ b/nanobot/utils/helpers.py
@@ -431,6 +431,7 @@ def estimate_prompt_tokens_chain(
             tokens, source = provider_counter(messages, tools, model)
             if isinstance(tokens, (int, float)) and tokens > 0:
                 return int(tokens), str(source or "provider_counter")
+    estimated = estimate_prompt_tokens(messages, tools)
     if estimated > 0:
         return int(estimated), "tiktoken"
     return 0, "none"