141 lines
5.4 KiB
Python
141 lines
5.4 KiB
Python
"""LLM 上下文准备。
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不改 Session 持久化历史,只在发给模型前做低风险压缩。只压旧 tool 消息**内容**,
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绝不动 assistant 的 `tool_call.arguments` —— arguments 是模型"该怎么调工具"的范本,
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把它改写成 `{"_compacted":...}` 这种"看着像合法调用"的标记会毒化模型:它在长任务里
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看到几十次"过去的 run_python/write 长这样",就照葫芦画瓢把 marker 当参数原样吐出来,
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executor 拿不到 code/path → 报错空转(2026-06-12 DB 实测 60 个 task 命中 83 次,
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其中 61 次是模型仿写 marker;详 PROGRESS)。故 arguments 一律原样保留。
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"""
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from __future__ import annotations
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from copy import deepcopy
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from typing import Any, List
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import json
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import re
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def _compact_old_tool_content(content: str, max_chars: int) -> str:
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if len(content) <= max_chars:
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return content
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head = max_chars // 2
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tail = max_chars - head
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omitted = len(content) - head - tail
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return (
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content[:head]
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+ f"\n[compacted old tool result, {omitted} chars omitted]\n"
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+ content[-tail:]
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)
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_LOAD_SKILL_HEADER_RE = re.compile(r"\[skill=([^,\]]+)(?:,\s*dir=([^\]]+))?\]")
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def _compact_load_skill_content(content: str) -> str:
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first_line = content.splitlines()[0] if content else ""
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match = _LOAD_SKILL_HEADER_RE.search(first_line)
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if match:
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skill = match.group(1)
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skill_dir = match.group(2) or ""
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suffix = f", dir={skill_dir}" if skill_dir else ""
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return f"[loaded skill: {skill}{suffix}; full SKILL.md omitted from old context]"
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return "[loaded skill; full SKILL.md omitted from old context]"
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def _message_chars(msg: dict[str, Any]) -> int:
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try:
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return len(json.dumps(msg, ensure_ascii=False))
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except TypeError:
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return len(str(msg))
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def prepare_messages_for_llm(
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messages: List[dict[str, Any]],
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*,
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keep_recent: int = 12,
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old_tool_chars: int = 2_000,
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compact_threshold_chars: int = 0,
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) -> List[dict[str, Any]]:
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"""返回发给 LLM 的 messages 副本。
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- system 和最近 keep_recent 条消息原样保留。
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- 较旧且过长的 tool content 压缩为头尾摘要。
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- assistant 的 tool_call.arguments 一律原样保留(改写会毒化模型,见模块注释)。
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- role/tool_call_id/name 等协议字段不变。
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"""
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prepared, _ = prepare_messages_with_stats(
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messages,
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keep_recent=keep_recent,
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old_tool_chars=old_tool_chars,
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compact_threshold_chars=compact_threshold_chars,
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)
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return prepared
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def prepare_messages_with_stats(
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messages: List[dict[str, Any]],
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*,
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keep_recent: int = 12,
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old_tool_chars: int = 2_000,
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compact_threshold_chars: int = 0,
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) -> tuple[List[dict[str, Any]], dict[str, int]]:
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"""返回发给 LLM 的 messages 副本和压缩统计。
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`compact_threshold_chars`:上下文压力门槛。总体量(原始 chars)未超过它时**完全不压缩**
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—— 短任务不丢旧工具细节,且 prompt 前缀逐轮字节一致、DeepSeek 等前缀缓存全程命中。
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默认 0 = 永远压缩(向后兼容)。caller(loop)按模型 reliable_context 折算传入。
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"""
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if keep_recent < 0:
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keep_recent = 0
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original_chars = sum(_message_chars(m) for m in messages)
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# 未到上下文压力门槛 → 原样发,零压缩(缓存全暖 + 不丢信息)。压缩是"放不下"才做的事。
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if original_chars < compact_threshold_chars:
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prepared = [deepcopy(m) for m in messages]
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stats = {
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"original_chars": original_chars,
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"sent_chars": original_chars,
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"saved_chars": 0,
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"compacted_tool_messages": 0,
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"compacted_skill_messages": 0,
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"compaction_skipped": 1,
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}
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return prepared, stats
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recent_start = max(0, len(messages) - keep_recent)
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prepared: List[dict[str, Any]] = []
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compacted_tool_messages = 0
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compacted_skill_messages = 0
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for idx, msg in enumerate(messages):
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new_msg = deepcopy(msg)
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is_recent = idx >= recent_start
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# assistant 的 tool_call.arguments 一律原样保留 —— 压成 marker 会毒化模型(见模块注释)。
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if (
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not is_recent
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and new_msg.get("role") == "tool"
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and isinstance(new_msg.get("content"), str)
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):
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before = new_msg["content"]
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if new_msg.get("name") == "load_skill":
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new_msg["content"] = _compact_load_skill_content(before)
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compacted_skill_messages += int(new_msg["content"] != before)
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elif new_msg.get("name") == "task_progress":
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new_msg["content"] = "[task_progress updated; UI-only details omitted from context]"
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else:
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new_msg["content"] = _compact_old_tool_content(
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before,
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max_chars=max(0, old_tool_chars),
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)
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compacted_tool_messages += int(new_msg["content"] != before)
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prepared.append(new_msg)
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sent_chars = sum(_message_chars(m) for m in prepared)
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stats = {
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"original_chars": original_chars,
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"sent_chars": sent_chars,
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"saved_chars": max(0, original_chars - sent_chars),
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"compacted_tool_messages": compacted_tool_messages,
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"compacted_skill_messages": compacted_skill_messages,
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"compaction_skipped": 0,
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}
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return prepared, stats
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