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3a27af0018
Add show_reasoning config (default: False) to display model thinking/reasoning content in the TUI during streaming. Reasoning is emitted via a new emit_reasoning hook on AgentHook, gated by the channels config. Display uses ✻ prefix with dim italic styling. Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>
130 lines
4.5 KiB
Python
130 lines
4.5 KiB
Python
"""Shared lifecycle hook primitives for agent runs."""
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from __future__ import annotations
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from dataclasses import dataclass, field
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from typing import Any
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from loguru import logger
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from nanobot.providers.base import LLMResponse, ToolCallRequest
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@dataclass(slots=True)
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class AgentHookContext:
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"""Mutable per-iteration state exposed to runner hooks."""
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iteration: int
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messages: list[dict[str, Any]]
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response: LLMResponse | None = None
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usage: dict[str, int] = field(default_factory=dict)
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tool_calls: list[ToolCallRequest] = field(default_factory=list)
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tool_results: list[Any] = field(default_factory=list)
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tool_events: list[dict[str, str]] = field(default_factory=list)
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streamed_content: bool = False
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final_content: str | None = None
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stop_reason: str | None = None
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error: str | None = None
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class AgentHook:
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"""Minimal lifecycle surface for shared runner customization."""
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def __init__(self, reraise: bool = False) -> None:
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self._reraise = reraise
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def wants_streaming(self) -> bool:
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return False
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async def before_iteration(self, context: AgentHookContext) -> None:
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pass
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async def on_stream(self, context: AgentHookContext, delta: str) -> None:
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pass
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async def on_stream_end(self, context: AgentHookContext, *, resuming: bool) -> None:
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pass
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async def before_execute_tools(self, context: AgentHookContext) -> None:
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pass
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async def emit_reasoning(self, reasoning_content: str | None) -> None:
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pass
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async def after_iteration(self, context: AgentHookContext) -> None:
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pass
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def finalize_content(self, context: AgentHookContext, content: str | None) -> str | None:
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return content
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class CompositeHook(AgentHook):
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"""Fan-out hook that delegates to an ordered list of hooks.
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Error isolation: async methods catch and log per-hook exceptions
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so a faulty custom hook cannot crash the agent loop.
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``finalize_content`` is a pipeline (no isolation — bugs should surface).
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"""
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__slots__ = ("_hooks",)
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def __init__(self, hooks: list[AgentHook]) -> None:
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super().__init__()
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self._hooks = list(hooks)
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def wants_streaming(self) -> bool:
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return any(h.wants_streaming() for h in self._hooks)
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async def _for_each_hook_safe(self, method_name: str, *args: Any, **kwargs: Any) -> None:
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for h in self._hooks:
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if getattr(h, "_reraise", False):
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await getattr(h, method_name)(*args, **kwargs)
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continue
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try:
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await getattr(h, method_name)(*args, **kwargs)
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except Exception:
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logger.exception("AgentHook.{} error in {}", method_name, type(h).__name__)
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async def before_iteration(self, context: AgentHookContext) -> None:
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await self._for_each_hook_safe("before_iteration", context)
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async def on_stream(self, context: AgentHookContext, delta: str) -> None:
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await self._for_each_hook_safe("on_stream", context, delta)
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async def on_stream_end(self, context: AgentHookContext, *, resuming: bool) -> None:
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await self._for_each_hook_safe("on_stream_end", context, resuming=resuming)
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async def before_execute_tools(self, context: AgentHookContext) -> None:
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await self._for_each_hook_safe("before_execute_tools", context)
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async def emit_reasoning(self, reasoning_content: str | None) -> None:
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await self._for_each_hook_safe("emit_reasoning", reasoning_content)
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async def after_iteration(self, context: AgentHookContext) -> None:
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await self._for_each_hook_safe("after_iteration", context)
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def finalize_content(self, context: AgentHookContext, content: str | None) -> str | None:
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for h in self._hooks:
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content = h.finalize_content(context, content)
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return content
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class SDKCaptureHook(AgentHook):
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"""Record tool names and the final message list for ``RunResult``.
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The runner mutates ``context.messages`` in place across iterations, so the
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snapshot is refreshed on every ``after_iteration`` call; the last call
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reflects the end-of-turn state the SDK caller cares about.
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"""
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def __init__(self) -> None:
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super().__init__()
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self.tools_used: list[str] = []
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self.messages: list[dict[str, Any]] = []
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async def after_iteration(self, context: AgentHookContext) -> None:
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for call in context.tool_calls:
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self.tools_used.append(call.name)
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self.messages = list(context.messages)
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