AI Agent Plugin System 2026

The Agent comes with 5 built-in tools, but users want to use a 6th one. Should you modify the code every time? The plugin system lets users attach their own tools.

💡 What You Will Learn

The Agent comes with 5 built-in tools, but users want to use a 6th one. Should you modify the code every time? The plugin system lets users attach their own tools.

Agent →  → 
                   → 
                   → Agent

# plugins/my_tool.py
from agent_sdk import tool

@tool(name="search_company_db",
      description="",
      author="")
def search_company_db(query: str) -> str:
    # 
    return results

Summary

import importlib, os

class PluginLoader:
    def __init__(self, plugin_dir="plugins"):
        self.plugins = {}
        for f in os.listdir(plugin_dir):
            if f.endswith(".py") and not f.startswith("_"):
                module_name = f[:-3]
                module = importlib.import_module(f"plugins.{module_name}")
                if hasattr(module, "register"):
                    tools = module.register()
                    self.plugins[module_name] = tools

    def get_all_tools(self):
        tools = []
        for name, plugin_tools in self.plugins.items():
            tools.extend(plugin_tools)
        return tools