AstrBot/astrbot/core/astr_agent_hooks.py

from typing import Any

from mcp.types import CallToolResult

from astrbot.core.agent.hooks import BaseAgentRunHooks
from astrbot.core.agent.message import Message
from astrbot.core.agent.run_context import ContextWrapper
from astrbot.core.agent.tool import FunctionTool
from astrbot.core.astr_agent_context import AstrAgentContext
from astrbot.core.pipeline.context_utils import call_event_hook
from astrbot.core.star.star_handler import EventType


def _sdk_safe_payload(value: Any) -> Any:
    if value is None or isinstance(value, (str, int, float, bool)):
        return value
    if isinstance(value, list):
        return [_sdk_safe_payload(item) for item in value]
    if isinstance(value, dict):
        return {str(key): _sdk_safe_payload(item) for key, item in value.items()}
    model_dump = getattr(value, "model_dump", None)
    if callable(model_dump):
        try:
            dumped = model_dump()
        except Exception:
            return str(value)
        return _sdk_safe_payload(dumped)
    return str(value)


class MainAgentHooks(BaseAgentRunHooks[AstrAgentContext]):
    async def on_agent_done(self, run_context, llm_response) -> None:
        # 执行事件钩子
        if llm_response and llm_response.reasoning_content:
            # we will use this in result_decorate stage to inject reasoning content to chain
            run_context.context.event.set_extra(
                "_llm_reasoning_content",
                llm_response.reasoning_content,
            )

        await call_event_hook(
            run_context.context.event,
            EventType.OnLLMResponseEvent,
            llm_response,
        )
        sdk_plugin_bridge = getattr(
            run_context.context.context,
            "sdk_plugin_bridge",
            None,
        )
        if sdk_plugin_bridge is not None:
            try:
                await sdk_plugin_bridge.dispatch_message_event(
                    "llm_response",
                    run_context.context.event,
                    {
                        "completion_text": (
                            llm_response.completion_text if llm_response else ""
                        ),
                        "tool_call_names": (
                            list(llm_response.tools_call_name)
                            if llm_response and llm_response.tools_call_name
                            else []
                        ),
                    },
                    llm_response=llm_response,
                )
            except Exception as exc:
                from astrbot.core import logger

                logger.warning("SDK llm_response dispatch failed: %s", exc)

    async def on_tool_start(
        self,
        run_context: ContextWrapper[AstrAgentContext],
        tool: FunctionTool[Any],
        tool_args: dict | None,
    ) -> None:
        await call_event_hook(
            run_context.context.event,
            EventType.OnUsingLLMToolEvent,
            tool,
            tool_args,
        )
        sdk_plugin_bridge = getattr(
            run_context.context.context,
            "sdk_plugin_bridge",
            None,
        )
        if sdk_plugin_bridge is not None:
            try:
                await sdk_plugin_bridge.dispatch_message_event(
                    "using_llm_tool",
                    run_context.context.event,
                    {
                        "tool_name": tool.name,
                        "tool_args": _sdk_safe_payload(tool_args),
                    },
                )
            except Exception as exc:
                from astrbot.core import logger

                logger.warning("SDK using_llm_tool dispatch failed: %s", exc)

    async def on_tool_end(
        self,
        run_context: ContextWrapper[AstrAgentContext],
        tool: FunctionTool[Any],
        tool_args: dict | None,
        tool_result: CallToolResult | None,
    ) -> None:
        run_context.context.event.clear_result()
        await call_event_hook(
            run_context.context.event,
            EventType.OnLLMToolRespondEvent,
            tool,
            tool_args,
            tool_result,
        )
        sdk_plugin_bridge = getattr(
            run_context.context.context,
            "sdk_plugin_bridge",
            None,
        )
        if sdk_plugin_bridge is not None:
            try:
                await sdk_plugin_bridge.dispatch_message_event(
                    "llm_tool_respond",
                    run_context.context.event,
                    {
                        "tool_name": tool.name,
                        "tool_args": _sdk_safe_payload(tool_args),
                        "tool_result": _sdk_safe_payload(tool_result),
                    },
                )
            except Exception as exc:
                from astrbot.core import logger

                logger.warning("SDK llm_tool_respond dispatch failed: %s", exc)

        # special handle web_search_tavily
        platform_name = run_context.context.event.get_platform_name()
        if (
            platform_name == "webchat"
            and tool.name
            in [
                "web_search_baidu",
                "web_search_tavily",
                "web_search_bocha",
                "web_search_brave",
            ]
            and len(run_context.messages) > 0
            and tool_result
            and len(tool_result.content)
        ):
            # inject system prompt
            first_part = run_context.messages[0]
            if (
                isinstance(first_part, Message)
                and first_part.role == "system"
                and first_part.content
                and isinstance(first_part.content, str)
            ):
                # we assume system part is str
                first_part.content += (
                    "Always cite web search results you rely on. "
                    "Index is a unique identifier for each search result. "
                    "Use the exact citation format <ref>index</ref> (e.g. <ref>abcd.3</ref>) "
                    "after the sentence that uses the information. Do not invent citations."
                )


class EmptyAgentHooks(BaseAgentRunHooks[AstrAgentContext]):
    pass


MAIN_AGENT_HOOKS = MainAgentHooks()