Problem
The return value of remote MCP is not a json dict but a string.
Steps to reproduce
- Build standard mcp services, which each return a dict
- Run following code, if the generated code require to print a filed of the result, error occur saying that cannot index a str using str.
from smolagents import ToolCollection, CodeAgent
from smolagents import OpenAIServerModel
model = OpenAIServerModel(
model_id=os.getenv("LLM_MODEL"),
api_base=os.getenv("LLM_BASE_URL"), # Leave this blank to query OpenAI servers.
api_key=os.getenv("LLM_API_KEY"), # Switch to the API key for the server you're targeting.
)
with ToolCollection.from_mcp({"url": "http://127.0.0.1:8000/stock_info/mcp", "transport": "streamable-http"}, trust_remote_code=True) as stock_info_tools:
agent = CodeAgent(tools=[*stock_info_tools.tools],
add_base_tools=True, model=model)
agent.run("Please output stock price of AAPL in the last 30 days")Actual behavior and error logs
The smolagent produces following code and runs into error mentioned above.
import datetime
# Get today's date and 30 days ago
today = datetime.datetime.now().date()
start_date = (today - datetime.timedelta(days=40)).strftime("%Y-%m-%d") # padding for non-trading days
end_date = today.strftime("%Y-%m-%d")
# Fetch stock data for AAPL for US market
aapl_data = stock_data(
ticker="AAPL",
startdate=start_date,
enddate=end_date,
period="daily",
market="us",
adjust="qfq"
)
print("Columns:", aapl_data["columns"]) # <---- error occurs
print("Number of rows:", len(aapl_data["data"]))
print("Sample row:", aapl_data["data"][-1] if aapl_data["data"] else "No data") Expected behavior
The remote mcp tool calling should return the exact object defined in function.
Environment:
Please complete the following information:
- OS: Mac Os
- Python version: 3.12
- Package version: 1.20
Add any other context, screenshots, or links about the bug here.
Checklist
Problem
The return value of remote MCP is not a json dict but a string.
Steps to reproduce
Actual behavior and error logs
The smolagent produces following code and runs into error mentioned above.
Expected behavior
The remote mcp tool calling should return the exact object defined in function.
Environment:
Please complete the following information:
Add any other context, screenshots, or links about the bug here.
Checklist