langchain-weather-demo

README

LangChain-Style Weather Tool (Automatic)

A minimal example showing LangChain-like simplicity in AgenticGoKit.

Quick Start

cd examples/langchain-weather-demo
# Make sure ollama is running and model available
# ollama pull gemma3:1b
GO111MODULE=on go run .

What it does

• Defines a single tool check_weather
• Registers it via RegisterInternalTool
• Builds an agent with WithPreset(vnext.ChatAgent) so tools are auto-used
• Runs a couple of queries; agent decides when to call the tool

Code highlights

• Tool: WeatherTool implements Name, Description, Execute
• Registration: in init() with RegisterInternalTool
• Agent: built with WithPreset (no custom handler needed)

Files

• main.go — everything in one file

Change model/provider

Update in main.go:

LLM: vnext.LLMConfig{
    Provider: "ollama", // change if needed
    Model:    "gemma3:1b",
}