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User Confirmation allows you to mark tools as requiring explicit user approval before execution. The agent pauses when it invokes such a tool; you present the pending call to the user, then call confirm() or reject() and resume with continue_run_async(). Ideal for sensitive operations like deletions, deployments, or payments.

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Quick Start

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

@tool(requires_confirmation=True)
def sensitive_operation(data: str) -> str:
    """Perform a sensitive operation that requires user confirmation."""
    return f"Sensitive operation completed on: {data}"

async def main():
    agent = Agent("anthropic/claude-sonnet-4-6", name="confirmation_agent")
    task = Task(
        description="Perform a sensitive operation on the data 'user_records_2024'.",
        tools=[sensitive_operation]
    )

    output = await agent.do_async(task, return_output=True)

    assert output.is_paused
    assert output.pause_reason == "confirmation"

    for requirement in output.active_requirements:
        if requirement.needs_confirmation:
            requirement.confirm()

    result = await agent.continue_run_async(run_id=output.run_id, return_output=True)
    print(result.output)

asyncio.run(main())

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Core Concepts

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Defining Tools That Require Confirmation

Use the @tool(requires_confirmation=True) decorator: 
from upsonic.tools import tool

@tool(requires_confirmation=True)
def sensitive_operation(data: str) -> str:
    """Perform a sensitive operation that requires user confirmation."""
    return f"Sensitive operation completed on: {data}"


@tool(requires_confirmation=True)
def delete_records(table: str, condition: str) -> str:
    """Delete records from a database table - requires user confirmation."""
    return f"Deleted records from {table} where {condition}"


@tool(requires_confirmation=True)
def deploy_to_production(version: str, environment: str) -> str:
    """Deploy application to production - requires user confirmation."""
    return f"Deployed version {version} to {environment}"

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Resolving Requirements

Each requirement exposes confirm() and reject(). Use them after you have output from agent.do_async(task, return_output=True): 
import asyncio
from upsonic import Agent, Task
from upsonic.tools import tool

@tool(requires_confirmation=True)
def sensitive_operation(data: str) -> str:
    """Perform a sensitive operation that requires user confirmation."""
    return f"Sensitive operation completed on: {data}"

async def main():
    agent = Agent("anthropic/claude-sonnet-4-6", name="confirmation_agent")
    task = Task(
        description="Perform a sensitive operation on the data 'user_records_2024'.",
        tools=[sensitive_operation]
    )
    output = await agent.do_async(task, return_output=True)

    for requirement in output.active_requirements:
        if requirement.needs_confirmation:
            requirement.confirm()
            # or: requirement.reject(note="Not authorized to run this operation")

    result = await agent.continue_run_async(run_id=output.run_id, return_output=True)
    print(result.output)

asyncio.run(main())
  • confirm(): Injects approval; the tool runs with the planned arguments when you resume.
  • reject(note=”…”): Injects rejection; the agent receives the note and continues without executing the tool.

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HITL Handler

Use a unified callback to resolve confirmation (and other HITL types) during continuation: 
import asyncio
from upsonic import Agent, Task
from upsonic.tools import tool

@tool(requires_confirmation=True)
def sensitive_operation(data: str) -> str:
    """Perform a sensitive operation that requires user confirmation."""
    return f"Sensitive operation completed on: {data}"

def hitl_handler(requirement) -> None:
    if requirement.needs_confirmation:
        requirement.confirm()

async def main():
    agent = Agent("anthropic/claude-sonnet-4-6", name="confirmation_agent")
    task = Task(
        description="Perform a sensitive operation on the data 'user_records_2024'.",
        tools=[sensitive_operation]
    )
    output = await agent.do_async(task, return_output=True)
    for requirement in output.active_requirements:
        if requirement.needs_confirmation:
            requirement.confirm()

    result = await agent.continue_run_async(
        run_id=output.run_id,
        return_output=True,
        hitl_handler=hitl_handler,
    )
    print(result.output)

asyncio.run(main())

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Continuation Methods

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Resume with run_id (Same Agent)

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

@tool(requires_confirmation=True)
def sensitive_operation(data: str) -> str:
    """Perform a sensitive operation that requires user confirmation."""
    return f"Sensitive operation completed on: {data}"

async def confirmation_approve_with_run_id_same_agent():
    agent = Agent("anthropic/claude-sonnet-4-6", name="confirmation_agent")
    task = Task(
        description="Perform a sensitive operation on the data 'user_records_2024'.",
        tools=[sensitive_operation]
    )

    output = await agent.do_async(task, return_output=True)

    for requirement in output.active_requirements:
        if requirement.needs_confirmation:
            requirement.confirm()

    result = await agent.continue_run_async(run_id=output.run_id, return_output=True)
    return result

asyncio.run(confirmation_approve_with_run_id_same_agent())

​
Resume with task (Same Agent)

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

@tool(requires_confirmation=True)
def sensitive_operation(data: str) -> str:
    """Perform a sensitive operation that requires user confirmation."""
    return f"Sensitive operation completed on: {data}"

async def confirmation_approve_with_task_same_agent():
    agent = Agent("anthropic/claude-sonnet-4-6", name="confirmation_agent")
    task = Task(
        description="Perform a sensitive operation on the data 'user_records_2024'.",
        tools=[sensitive_operation]
    )

    output = await agent.do_async(task, return_output=True)

    for requirement in output.active_requirements:
        if requirement.needs_confirmation:
            requirement.confirm()

    result = await agent.continue_run_async(task=task, return_output=True)
    return result

asyncio.run(confirmation_approve_with_task_same_agent())

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Rejecting a Tool Call

The agent receives the rejection note and completes without executing the tool: 
import asyncio
from upsonic import Agent, Task
from upsonic.tools import tool

@tool(requires_confirmation=True)
def sensitive_operation(data: str) -> str:
    """Perform a sensitive operation that requires user confirmation."""
    return f"Sensitive operation completed on: {data}"

async def confirmation_reject_with_run_id_same_agent():
    agent = Agent("anthropic/claude-sonnet-4-6", name="confirmation_agent")
    task = Task(
        description="Perform a sensitive operation on the data 'user_records_2024'.",
        tools=[sensitive_operation]
    )

    output = await agent.do_async(task, return_output=True)

    for requirement in output.active_requirements:
        if requirement.needs_confirmation:
            requirement.reject(note="Not authorized to run this operation")

    result = await agent.continue_run_async(run_id=output.run_id, return_output=True)
    return result

asyncio.run(confirmation_reject_with_run_id_same_agent())

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Resume with run_id (New Agent - Cross-Process)

Use persistent storage and pass requirements when resuming with a new agent: 
import asyncio
from upsonic import Agent, Task
from upsonic.tools import tool
from upsonic.db.database import SqliteDatabase

@tool(requires_confirmation=True)
def sensitive_operation(data: str) -> str:
    """Perform a sensitive operation that requires user confirmation."""
    return f"Sensitive operation completed on: {data}"

async def confirmation_with_run_id_new_agent():
    db = SqliteDatabase(db_file="confirmation.db", session_id="session_1", user_id="user_1")
    agent = Agent("anthropic/claude-sonnet-4-6", name="confirmation_agent", db=db)
    task = Task(
        description="Perform a sensitive operation on the data 'user_records_2024'.",
        tools=[sensitive_operation]
    )

    output = await agent.do_async(task, return_output=True)
    run_id = output.run_id

    for requirement in output.active_requirements:
        if requirement.needs_confirmation:
            requirement.confirm()

    new_agent = Agent("anthropic/claude-sonnet-4-6", name="confirmation_agent", db=db)
    result = await new_agent.continue_run_async(
        run_id=run_id,
        requirements=output.requirements,
        return_output=True
    )
    return result

asyncio.run(confirmation_with_run_id_new_agent())

​
Resume with task (New Agent - Cross-Process)

import asyncio
from upsonic import Agent, Task
from upsonic.tools import tool
from upsonic.db.database import SqliteDatabase

@tool(requires_confirmation=True)
def sensitive_operation(data: str) -> str:
    """Perform a sensitive operation that requires user confirmation."""
    return f"Sensitive operation completed on: {data}"

async def confirmation_with_task_new_agent():
    db = SqliteDatabase(db_file="confirmation.db", session_id="session_1", user_id="user_1")
    agent = Agent("anthropic/claude-sonnet-4-6", name="confirmation_agent", db=db)
    task = Task(
        description="Perform a sensitive operation on the data 'user_records_2024'.",
        tools=[sensitive_operation]
    )

    output = await agent.do_async(task, return_output=True)

    for requirement in output.active_requirements:
        if requirement.needs_confirmation:
            requirement.confirm()

    new_agent = Agent("anthropic/claude-sonnet-4-6", name="confirmation_agent", db=db)
    result = await new_agent.continue_run_async(
        task=task,
        requirements=output.requirements,
        return_output=True
    )
    return result

asyncio.run(confirmation_with_task_new_agent())

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Multiple Confirmation Tools

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Loop-Based Handling

When the agent invokes multiple confirmation tools, loop until there are no active requirements: 
import asyncio
from upsonic import Agent, Task
from upsonic.tools import tool

@tool(requires_confirmation=True)
def delete_records(table: str, condition: str) -> str:
    """Delete records - requires user confirmation."""
    return f"Deleted records from {table} where {condition}"

@tool(requires_confirmation=True)
def deploy_to_production(version: str, environment: str) -> str:
    """Deploy to production - requires user confirmation."""
    return f"Deployed version {version} to {environment}"

async def confirmation_multiple_tools_loop_run_id():
    agent = Agent("anthropic/claude-sonnet-4-6", name="confirmation_agent")
    task = Task(
        description=(
            "First, delete records from the 'users' table where status='inactive'. "
            "Then deploy version '2.1.0' to the 'production' environment."
        ),
        tools=[delete_records, deploy_to_production]
    )

    output = await agent.do_async(task, return_output=True)

    while output.active_requirements:
        for requirement in output.active_requirements:
            if requirement.needs_confirmation:
                requirement.confirm()

        output = await agent.continue_run_async(
            run_id=output.run_id,
            return_output=True
        )

    return output

asyncio.run(confirmation_multiple_tools_loop_run_id())

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Using hitl_handler for Multiple Tools

Resolve the first pause yourself, then pass hitl_handler so subsequent confirmation pauses are handled automatically: 
import asyncio
from upsonic import Agent, Task
from upsonic.tools import tool

@tool(requires_confirmation=True)
def delete_records(table: str, condition: str) -> str:
    """Delete records - requires user confirmation."""
    return f"Deleted records from {table} where {condition}"

@tool(requires_confirmation=True)
def deploy_to_production(version: str, environment: str) -> str:
    """Deploy to production - requires user confirmation."""
    return f"Deployed version {version} to {environment}"

def hitl_handler(requirement) -> None:
    if requirement.needs_confirmation:
        requirement.confirm()

async def confirmation_multiple_tools_handler_run_id():
    agent = Agent("anthropic/claude-sonnet-4-6", name="confirmation_agent")
    task = Task(
        description=(
            "First, delete records from the 'users' table where status='inactive'. "
            "Then deploy version '2.1.0' to the 'production' environment."
        ),
        tools=[delete_records, deploy_to_production]
    )

    output = await agent.do_async(task, return_output=True)

    for requirement in output.active_requirements:
        if requirement.needs_confirmation:
            requirement.confirm()

    result = await agent.continue_run_async(
        run_id=output.run_id,
        return_output=True,
        hitl_handler=hitl_handler,
    )
    return result

asyncio.run(confirmation_multiple_tools_handler_run_id())

​
Cross-Process Confirmation

Full pattern: one process runs the agent and pauses; another (or same) process resolves confirmation and resumes with a new agent: 
import asyncio
from upsonic import Agent, Task
from upsonic.tools import tool
from upsonic.db.database import SqliteDatabase

@tool(requires_confirmation=True)
def sensitive_operation(data: str) -> str:
    """Perform a sensitive operation that requires user confirmation."""
    return f"Sensitive operation completed on: {data}"

async def confirmation_cross_process_run_id():
    db = SqliteDatabase(db_file="confirmation.db", session_id="session_1", user_id="user_1")
    agent = Agent("anthropic/claude-sonnet-4-6", name="confirmation_agent", db=db)
    task = Task(
        description="Perform a sensitive operation on the data 'audit_logs'.",
        tools=[sensitive_operation]
    )

    output = await agent.do_async(task, return_output=True)
    run_id = output.run_id

    if output.is_paused and output.active_requirements:
        for req in output.active_requirements:
            if req.tool_execution:
                print(f"  - Tool: {req.tool_execution.tool_name}")
                print(f"    Args: {req.tool_execution.tool_args}")

    for req in output.active_requirements:
        if req.needs_confirmation:
            req.confirm()

    new_db = SqliteDatabase(db_file="confirmation.db", session_id="session_1", user_id="user_1")
    new_agent = Agent("anthropic/claude-sonnet-4-6", name="confirmation_agent", db=new_db)
    result = await new_agent.continue_run_async(
        run_id=run_id,
        requirements=output.requirements,
        return_output=True
    )
    return result

asyncio.run(confirmation_cross_process_run_id())

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Important Notes

  • Direct Call Mode Only: HITL continuation only supports direct call mode. Streaming is not supported for continuation.
  • Requirements Parameter: When resuming with a new agent, pass requirements=output.requirements so the resolved confirm/reject state is applied.
  • Persistent Storage: For cross-process scenarios, use persistent storage (e.g. SqliteDatabase).
  • pause_reason: When paused for confirmation, output.pause_reason == "confirmation" and output.is_paused is True.