File size: 2,752 Bytes
8ede856 | 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 | from typing import Generic
from .agent import Agent
from .run_context import TContext
from .tool import FunctionTool
class HandoffTool(FunctionTool, Generic[TContext]):
"""Handoff tool for delegating tasks to another agent."""
def __init__(
self,
agent: Agent[TContext],
parameters: dict | None = None,
tool_description: str | None = None,
**kwargs,
) -> None:
# Avoid passing duplicate `description` to the FunctionTool dataclass.
# Some call sites (e.g. SubAgentOrchestrator) pass `description` via kwargs
# to override what the main agent sees, while we also compute a default
# description here.
# `tool_description` is the public description shown to the main LLM.
# Keep a separate kwarg to avoid conflicting with FunctionTool's `description`.
description = tool_description or self.default_description(agent.name)
super().__init__(
name=f"transfer_to_{agent.name}",
parameters=parameters or self.default_parameters(),
description=description,
**kwargs,
)
# Optional provider override for this subagent. When set, the handoff
# execution will use this chat provider id instead of the global/default.
self.provider_id: str | None = None
# Note: Must assign after super().__init__() to prevent parent class from overriding this attribute
self.agent = agent
def default_parameters(self) -> dict:
return {
"type": "object",
"properties": {
"input": {
"type": "string",
"description": "The input to be handed off to another agent. This should be a clear and concise request or task.",
},
"image_urls": {
"type": "array",
"items": {"type": "string"},
"description": "Optional: An array of image sources (public HTTP URLs or local file paths) used as references in multimodal tasks such as video generation.",
},
"background_task": {
"type": "boolean",
"description": (
"Defaults to false. "
"Set to true if the task may take noticeable time, involves external tools, or the user does not need to wait. "
"Use false only for quick, immediate tasks."
),
},
},
}
def default_description(self, agent_name: str | None) -> str:
agent_name = agent_name or "another"
return f"Delegate tasks to {self.name} agent to handle the request."
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