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Adding Tools to Agent

Agent-level tools are available for every task that agent executes.

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On Initialization

from upsonic import Agent, Task
from upsonic.tools import tool

@tool
def add(a: int, b: int) -> int:
    """Add two numbers."""
    return a + b

agent = Agent("anthropic/claude-sonnet-4-5", tools=[add])

task = Task(description="What is 5 + 3?")
result = agent.print_do(task)
print("Result:", result)

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Dynamically with add_tools

from upsonic import Agent, Task
from upsonic.tools import tool

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

@tool
def divide(a: int, b: int) -> float:
    """Divide two numbers."""
    return a / b

agent = Agent(model="anthropic/claude-sonnet-4-5")
agent.add_tools(multiply)              # Single tool
agent.add_tools([divide])              # Multiple tools

task = Task(description="What is 10 multiplied by 5?")
result = agent.print_do(task)
print("Result:", result)

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Adding Tools to Task

Task-level tools are only available for that specific task. Other tasks run by the same agent cannot use them.

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On Initialization

from upsonic import Agent, Task
from upsonic.tools import tool

@tool
def calculate_tax(amount: float, rate: float) -> float:
    """Calculate tax for given amount."""
    return amount * rate

agent = Agent(model="anthropic/claude-sonnet-4-5")

# calculate_tax is only available for this task
task = Task(
    description="Calculate 18% tax on 1000",
    tools=[calculate_tax]
)
result = agent.print_do(task)
print("Result:", result)

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Dynamically with add_tools

from upsonic import Agent, Task
from upsonic.tools import tool

@tool
def add(a: int, b: int) -> int:
    """Add two numbers."""
    return a + b

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

agent = Agent(model="anthropic/claude-sonnet-4-5")
task = Task(description="Calculate 5 + 3 and then multiply by 2", tools=[add])
task.add_tools(multiply)

result = agent.print_do(task)
print("Result:", result)

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Deduplication

Upsonic automatically prevents duplicate tool registration: 
from upsonic import Agent
from upsonic.tools import tool

@tool
def add(a: int, b: int) -> int:
    """Add two numbers."""
    return a + b

agent = Agent("anthropic/claude-sonnet-4-5")

agent.add_tools(add)

# Subsequent registrations are ignored
agent.add_tools(add)       # Ignored - same object
agent.add_tools([add])     # Ignored - same object
agent.add_tools([add, add])  # Only registered once

print(len(agent.registered_agent_tools))  # Output: 1

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Re-adding After Removal

After removing a tool, you can re-add it: 
from upsonic import Agent
from upsonic.tools import tool, ToolKit

class MathKit(ToolKit):
    @tool
    def add(self, a: int, b: int) -> int:
        """Add two numbers."""
        return a + b

kit = MathKit()
agent = Agent("anthropic/claude-sonnet-4-5")

agent.add_tools(kit)
print("add" in agent.registered_agent_tools)  # True

agent.remove_tools(kit)
print("add" in agent.registered_agent_tools)  # False

agent.add_tools(kit)
print("add" in agent.registered_agent_tools)  # True