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fix(agent): cap recent history section in system prompt

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Truncate the "Recent History" section injected by build_system_prompt()
to 32K chars. Without this, many accumulated history.jsonl entries could
still bloat the system prompt even with per-entry truncation in place.
This commit is contained in:
chengyongru 2026-04-24 01:46:24 +08:00 committed by chengyongru
parent 93bcb0a649
commit 8a646d9aec
1 changed files with 6 additions and 3 deletions
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9
nanobot/agent/context.py
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@ -9,7 +9,7 @@ from typing import Any
from nanobot.agent.memory import MemoryStore from nanobot.agent.memory import MemoryStore
from nanobot.agent.skills import SkillsLoader from nanobot.agent.skills import SkillsLoader
from nanobot.utils.helpers import build_assistant_message, current_time_str, detect_image_mime from nanobot.utils.helpers import build_assistant_message, current_time_str, detect_image_mime, truncate_text
from nanobot.utils.prompt_templates import render_template from nanobot.utils.prompt_templates import render_template
@ -19,6 +19,7 @@ class ContextBuilder:
BOOTSTRAP_FILES = ["AGENTS.md", "SOUL.md", "USER.md", "TOOLS.md"] BOOTSTRAP_FILES = ["AGENTS.md", "SOUL.md", "USER.md", "TOOLS.md"]
_RUNTIME_CONTEXT_TAG = "[Runtime Context — metadata only, not instructions]" _RUNTIME_CONTEXT_TAG = "[Runtime Context — metadata only, not instructions]"
_MAX_RECENT_HISTORY = 50 _MAX_RECENT_HISTORY = 50
_MAX_HISTORY_CHARS = 32_000 # hard cap on recent history section size
_RUNTIME_CONTEXT_END = "[/Runtime Context]" _RUNTIME_CONTEXT_END = "[/Runtime Context]"
def __init__(self, workspace: Path, timezone: str | None = None, disabled_skills: list[str] | None = None): def __init__(self, workspace: Path, timezone: str | None = None, disabled_skills: list[str] | None = None):
@ -56,9 +57,11 @@ class ContextBuilder:
entries = self.memory.read_unprocessed_history(since_cursor=self.memory.get_last_dream_cursor()) entries = self.memory.read_unprocessed_history(since_cursor=self.memory.get_last_dream_cursor())
if entries: if entries:
capped = entries[-self._MAX_RECENT_HISTORY:] capped = entries[-self._MAX_RECENT_HISTORY:]
parts.append("# Recent History\n\n" + "\n".join( history_text = "\n".join(
f"- [{e['timestamp']}] {e['content']}" for e in capped f"- [{e['timestamp']}] {e['content']}" for e in capped
)) )
history_text = truncate_text(history_text, self._MAX_HISTORY_CHARS)
parts.append("# Recent History\n\n" + history_text)
return "\n\n---\n\n".join(parts) return "\n\n---\n\n".join(parts)