litellm-deepseek.py

from agents import Agent, ModelSettings, Runner, function_tool
from agents.extensions.models.litellm_model import LitellmModel
from openai.types.shared import Reasoning
import os

@function_tool
def echo_tool(input: str) -> str:
    return input

@function_tool
def speak_tool(input: str) -> str:
    return input

@function_tool
def final_tool(input: str) -> str:
    return input

model = LitellmModel(
    model="deepseek/deepseek-reasoner",
    api_key=os.getenv("DEEPSEEK_API_KEY")
    
)
agent = Agent(
    name="Assistant",
    instructions="You are a helpful assistant",
    model=model,
    tools=[echo_tool, speak_tool, final_tool],
    # model_settings=ModelSettings(reasoning=Reasoning(effort="low"))
    #model_settings=ModelSettings( 
   #     extra_body={"thinking": {"type": "enabled"}}
    #)
)
print("================================================ Turn 1")
result = Runner.run_sync(
    agent, "think about life, then use echo_tool and speak_tool"
)

print(result.final_output)
print("----------")
print(result.to_input_list())

messages = result.to_input_list()

print("================================================ Turn 2")

messages.append( { "role": "user", "content": "summarize the above content, then use final_tool"})

result = Runner.run_sync(
    agent, messages
)

print(result.final_output)
print("----------")
print(result.to_input_list())

# 2025/12/6 error
# litellm.llms.openai.common_utils.OpenAIError: {"error":{"message":"Missing `reasoning_content` field in the assistant message at 
# message index 2. For more information, please refer to https://api-docs.deepseek.com/guides/thinking_mode#tool-calls","type":"invalid_request_error","param":null,"code":"invalid_request_error"}}