From 3dd3242c6d97c6923a720ab40690dcc31f9cb12e Mon Sep 17 00:00:00 2001
From: cthomas <caren@letta.com>
Date: Mon, 31 Mar 2025 09:49:15 -0700
Subject: [PATCH] fix: anthropic system event parse (#1471)

---
 letta/llm_api/anthropic_client.py | 14 ++++++--------
 letta/schemas/message.py          |  2 +-
 2 files changed, 7 insertions(+), 9 deletions(-)

diff --git a/letta/llm_api/anthropic_client.py b/letta/llm_api/anthropic_client.py
index 86a1f09f..ee73c09f 100644
--- a/letta/llm_api/anthropic_client.py
+++ b/letta/llm_api/anthropic_client.py
@@ -113,21 +113,19 @@ class AnthropicClient(LLMClientBase):
 
         # Messages
         inner_thoughts_xml_tag = "thinking"
+
+        # Move 'system' to the top level
+        if messages[0].role != "system":
+            raise RuntimeError(f"First message is not a system message, instead has role {messages[0].role}")
+        data["system"] = messages[0].content if isinstance(messages[0].content, str) else messages[0].content[0].text
         data["messages"] = [
             m.to_anthropic_dict(
                 inner_thoughts_xml_tag=inner_thoughts_xml_tag,
                 put_inner_thoughts_in_kwargs=bool(self.llm_config.put_inner_thoughts_in_kwargs),
             )
-            for m in messages
+            for m in messages[1:]
         ]
 
-        # Move 'system' to the top level
-        if data["messages"][0]["role"] != "system":
-            raise RuntimeError(f'First message is not a system message, instead has role {data["messages"][0]["role"]}')
-
-        data["system"] = data["messages"][0]["content"]
-        data["messages"] = data["messages"][1:]
-
         # Ensure first message is user
         if data["messages"][0]["role"] != "user":
             data["messages"] = [{"role": "user", "content": DUMMY_FIRST_USER_MESSAGE}] + data["messages"]
diff --git a/letta/schemas/message.py b/letta/schemas/message.py
index 503a4072..65e5d84b 100644
--- a/letta/schemas/message.py
+++ b/letta/schemas/message.py
@@ -681,7 +681,7 @@ class Message(BaseMessage):
             user_system_event = add_xml_tag(string=f"SYSTEM ALERT: {text_content}", xml_tag="event")
             anthropic_message = {
                 "content": user_system_event,
-                "role": "system",
+                "role": "user",
             }
 
         elif self.role == "user":