responses-openai-open-router.py

# https://openrouter.ai/docs/api/reference/responses/overview
from agents import Agent, ModelSettings, Runner, function_tool, OpenAIResponsesModel, set_tracing_disabled
from agents.extensions.models.litellm_model import LitellmModel
from openai.types.shared import Reasoning
from openai import AsyncOpenAI
import os

set_tracing_disabled(disabled=True)

client = AsyncOpenAI(
    base_url="https://openrouter.ai/api/v1/",
    api_key=os.getenv("OPENROUTER_API_KEY"),
)

model = OpenAIResponsesModel(
    model="openai/gpt-oss-120b",
    openai_client=client
)

@function_tool
def echo_tool(input: str) -> str:
    print("called echo_tool !!!")
    return input


agent = Agent(
    name="Assistant",
    instructions="You are a helpful assistant",
    model=model,
    tools=[echo_tool],
    model_settings=ModelSettings(reasoning=Reasoning(effort="low"))
)
result = Runner.run_sync(
    agent, "Can you use the echo_tool to echo the message 'Hello, world!"
)
print(result.final_output)
print("------")
print(result.to_input_list())