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A Toolkit is a collection of related tools packaged together. Instead of managing individual tool functions, you group them into a class that can be shared across agents and projects.

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Creating a Toolkit

Subclass Toolkit and define tool methods: 
from definable.agents import Toolkit
from definable.tools import tool

class MathToolkit(Toolkit):
    @tool
    def add(self, a: float, b: float) -> float:
        """Add two numbers."""
        return a + b

    @tool
    def multiply(self, a: float, b: float) -> float:
        """Multiply two numbers."""
        return a * b

    @tool
    def divide(self, a: float, b: float) -> str:
        """Divide two numbers."""
        if b == 0:
            return "Error: Division by zero"
        return str(a / b)
Tools are discovered automatically — any method decorated with @tool is included.

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Using a Toolkit

Pass toolkit instances to an agent: 
from definable.agents import Agent
from definable.models import OpenAIChat

agent = Agent(
    model=OpenAIChat(id="gpt-4o"),
    toolkits=[MathToolkit()],
)

output = agent.run("What is 15 * 23, then divide the result by 5?")
print(output.content)

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Toolkit with Dependencies

Pass shared dependencies that all tools in the toolkit can access: 
class DatabaseToolkit(Toolkit):
    def __init__(self, connection_string: str):
        self.db = Database(connection_string)
        super().__init__()

    @tool
    def run_query(self, sql: str) -> str:
        """Execute a SQL query."""
        return str(self.db.execute(sql))

    @tool
    def list_tables(self) -> str:
        """List all database tables."""
        return str(self.db.get_tables())

# Usage
toolkit = DatabaseToolkit("postgresql://localhost/mydb")
agent = Agent(model=model, toolkits=[toolkit])

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Combining Toolkits and Tools

Agents can use both individual tools and toolkits together: 
@tool
def get_current_time() -> str:
    """Get the current time."""
    from datetime import datetime
    return datetime.now().isoformat()

agent = Agent(
    model=OpenAIChat(id="gpt-4o"),
    tools=[get_current_time],
    toolkits=[MathToolkit(), DatabaseToolkit(conn_str)],
)

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Toolkit Properties

PropertyTypeDescription
toolsList[Function]All tool functions in the toolkit
namestrToolkit name (defaults to the class name)
dependenciesdictShared dependencies dictionary

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Built-in Toolkits

Definable includes two built-in toolkits:

KnowledgeToolkit

Give agents explicit tools to search a knowledge base on demand.

MCPToolkit

Expose tools from MCP servers to your agents.