Function Calling with Tools in Ollama
From the Ollama cheat sheet · Tool Calling · verified Jul 2026
Function Calling with Tools
Define tools that models can invoke, then process the tool calls.
python
# Python — pass functions directly as tools
from ollama import chat
def get_weather(city: str) -> str:
"""Get current weather for a city"""
return f"Sunny, 22°C in {city}"
response = chat(
model='qwen3',
messages=[{'role': 'user', 'content': 'Weather in NYC?'}],
tools=[get_weather],
)💡 Python SDK auto-generates tool schemas from type hints and docstrings
⚡ Tool calling uses a two-step flow: model requests tools, you execute and return results
📌 Models like qwen3, llama3.2, and command-r support tool calling
🟢 Add role: "tool" messages with results so the model can form its final answer
toolsfunction-calling