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hkuds--nanobot/tests/agent/test_consolidator.py
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Python

"""Tests for the lightweight Consolidator — append-only to HISTORY.md."""
from dataclasses import replace
from unittest.mock import AsyncMock, MagicMock
import pytest
from nanobot.agent.memory import (
_ARCHIVE_SUMMARY_MAX_CHARS,
Consolidator,
MemoryStore,
)
from nanobot.providers.base import GenerationSettings, LLMResponse
from nanobot.runtime_context import (
RUNTIME_CONTEXT_HISTORY_META,
RuntimeContextBlock,
append_runtime_context,
)
from nanobot.session.manager import Session
from nanobot.utils.llm_runtime import LLMRuntime
from nanobot.utils.prompt_templates import render_template
@pytest.fixture
def store(tmp_path):
return MemoryStore(tmp_path)
@pytest.fixture
def mock_provider():
p = MagicMock()
p.chat_with_retry = AsyncMock()
p.generation = GenerationSettings(max_tokens=100)
return p
@pytest.fixture
def runtime(mock_provider):
return LLMRuntime.capture(
mock_provider,
"test-model",
context_window_tokens=1000,
)
@pytest.fixture
def consolidator(store):
sessions = MagicMock()
sessions.save = MagicMock()
# When maybe_consolidate_by_tokens refreshes the session reference via
# get_or_create(session.key), it should get back the same object the test
# passed in. Store sessions by key so the lookup is transparent.
_session_cache: dict[str, MagicMock] = {}
sessions.get_or_create = MagicMock(side_effect=lambda key: _session_cache.get(key, MagicMock()))
sessions._session_cache = _session_cache
return Consolidator(
store=store,
sessions=sessions,
build_messages=MagicMock(return_value=[]),
get_tool_definitions=MagicMock(return_value=[]),
)
def _tool_round(call_id: str) -> list[dict]:
return [
{
"role": "assistant",
"content": None,
"tool_calls": [
{"id": call_id, "type": "function", "function": {"name": "x", "arguments": "{}"}}
],
},
{"role": "tool", "tool_call_id": call_id, "name": "x", "content": "ok"},
]
class TestConsolidatorSummarize:
async def test_archive_excludes_model_only_runtime_context(
self, consolidator, mock_provider, runtime
):
content, marker = append_runtime_context(
"ship the feature",
[RuntimeContextBlock(source="goal", content="host-only goal guidance")],
)
mock_provider.chat_with_retry.return_value = MagicMock(
content="User wants to ship the feature.",
finish_reason="stop",
)
await consolidator.archive(
[{
"role": "user",
"content": content,
RUNTIME_CONTEXT_HISTORY_META: marker,
}],
runtime=runtime,
)
prompt = mock_provider.chat_with_retry.call_args.kwargs["messages"][1]["content"]
assert "ship the feature" in prompt
assert "host-only goal guidance" not in prompt
async def test_archive_uses_captured_generation(
self, consolidator, mock_provider, runtime
):
admitted = replace(
runtime,
generation=GenerationSettings(
temperature=0.25,
max_tokens=321,
reasoning_effort="medium",
),
)
mock_provider.generation = GenerationSettings(
temperature=0.9,
max_tokens=999,
reasoning_effort="high",
)
mock_provider.chat_with_retry.return_value = MagicMock(
content="Summary.",
finish_reason="stop",
)
await consolidator.archive(
[{"role": "user", "content": "hello"}],
runtime=admitted,
)
call = mock_provider.chat_with_retry.call_args.kwargs
assert call["model"] == admitted.model
assert call["temperature"] == 0.25
assert call["max_tokens"] == 321
assert call["reasoning_effort"] == "medium"
async def test_summarize_appends_to_history(
self, consolidator, mock_provider, store, runtime
):
"""Consolidator should call LLM to summarize, then append to HISTORY.md."""
mock_provider.chat_with_retry.return_value = MagicMock(
content="User fixed a bug in the auth module."
)
messages = [
{"role": "user", "content": "fix the auth bug"},
{"role": "assistant", "content": "Done, fixed the race condition."},
]
result = await consolidator.archive(messages, runtime=runtime)
assert result == "User fixed a bug in the auth module."
entries = store.read_unprocessed_history(since_cursor=0)
assert len(entries) == 1
async def test_summarize_appends_session_key_to_history(
self,
consolidator,
mock_provider,
store,
runtime,
):
mock_provider.chat_with_retry.return_value = MagicMock(
content="User fixed a bug in the auth module.",
finish_reason="stop",
)
messages = [{"role": "user", "content": "fix the auth bug"}]
await consolidator.archive(
messages,
runtime=runtime,
session_key="telegram:chat-1",
)
entries = store.read_unprocessed_history(since_cursor=0)
assert entries[0]["session_key"] == "telegram:chat-1"
async def test_summarize_raw_dumps_on_llm_failure(
self, consolidator, mock_provider, store, runtime
):
"""On LLM failure, raw-dump messages to HISTORY.md."""
mock_provider.chat_with_retry.side_effect = Exception("API error")
messages = [{"role": "user", "content": "hello"}]
result = await consolidator.archive(messages, runtime=runtime)
assert result is None # no summary on raw dump fallback
entries = store.read_unprocessed_history(since_cursor=0)
assert len(entries) == 1
assert "[RAW]" in entries[0]["content"]
async def test_raw_dump_fallback_appends_session_key(
self,
consolidator,
mock_provider,
store,
runtime,
):
mock_provider.chat_with_retry.side_effect = Exception("API error")
messages = [{"role": "user", "content": "hello"}]
await consolidator.archive(
messages,
runtime=runtime,
session_key="slack:chat-2",
)
entries = store.read_unprocessed_history(since_cursor=0)
assert entries[0]["session_key"] == "slack:chat-2"
async def test_summarize_skips_empty_messages(self, consolidator, runtime):
result = await consolidator.archive([], runtime=runtime)
assert result is None
class TestConsolidatorPromptContract:
def test_archive_prompt_outputs_attribute_tags_without_missing_context_claims(self):
prompt = render_template("agent/consolidator_archive.md", strip=True)
assert "SNIP" in prompt
for mark in ("[permanent]", "[durable]", "[ephemeral]", "[correction]", "[skip]"):
assert mark in prompt
assert "check context below" not in prompt.lower()
assert "Do not mark something [skip] merely because it might already exist" in prompt
class TestConsolidatorArchiveErrorHandling:
"""archive() must fall back to raw_archive when the LLM returns an error
response (finish_reason == 'error'), e.g. overloaded / quota exceeded.
See https://github.com/HKUDS/nanobot/issues/3244
"""
async def test_archive_falls_back_on_error_finish_reason(
self, consolidator, mock_provider, store, runtime
):
"""LLM returning finish_reason='error' should trigger raw_archive, not write error text."""
mock_provider.chat_with_retry.return_value = MagicMock(
content="Error: {'type': 'error', 'error': {'type': 'overloaded_error', 'message': 'overloaded_error (529)'}}",
finish_reason="error",
)
messages = [
{"role": "user", "content": "fix the auth bug"},
{"role": "assistant", "content": "Done, fixed the race condition."},
]
result = await consolidator.archive(messages, runtime=runtime)
assert result is None
entries = store.read_unprocessed_history(since_cursor=0)
assert len(entries) == 1
assert "[RAW]" in entries[0]["content"]
assert "Error:" not in entries[0]["content"]
async def test_archive_preserves_summary_on_success(
self, consolidator, mock_provider, store, runtime
):
"""Normal LLM response should still produce a proper summary entry."""
mock_provider.chat_with_retry.return_value = MagicMock(
content="User fixed a bug in the auth module.",
finish_reason="stop",
)
messages = [
{"role": "user", "content": "fix the auth bug"},
{"role": "assistant", "content": "Done."},
]
result = await consolidator.archive(messages, runtime=runtime)
assert result == "User fixed a bug in the auth module."
entries = store.read_unprocessed_history(since_cursor=0)
assert len(entries) == 1
assert "[RAW]" not in entries[0]["content"]
class TestConsolidatorTokenBudget:
async def test_prompt_below_threshold_does_not_consolidate(
self, consolidator, runtime
):
"""No consolidation when tokens are within budget."""
session = MagicMock()
session.last_consolidated = 0
session.messages = [{"role": "user", "content": "hi"}]
session.key = "test:key"
consolidator.sessions._session_cache[session.key] = session
consolidator.estimate_session_prompt_tokens = MagicMock(return_value=(100, "tiktoken"))
consolidator.archive = AsyncMock(return_value=True)
await consolidator.maybe_consolidate_by_tokens(session, runtime=runtime)
consolidator.archive.assert_not_called()
async def test_estimate_uses_full_unconsolidated_tail(self, consolidator, runtime):
"""Consolidation pressure must see messages hidden by the replay window."""
session = Session(key="test:full-tail")
for i in range(160):
session.add_message("user", f"msg-{i}")
captured: dict[str, list[dict]] = {}
def build_messages(**kwargs):
captured["history"] = kwargs["history"]
return kwargs["history"]
consolidator._build_messages = build_messages
consolidator.estimate_session_prompt_tokens(session, runtime=runtime)
assert len(captured["history"]) == 160
assert captured["history"][0]["content"].endswith("msg-0")
async def test_replay_window_overflow_is_archived_even_under_token_budget(
self,
consolidator,
runtime,
):
"""Old messages that cannot be replayed should be materialized first."""
consolidator._SAFETY_BUFFER = 0
session = Session(key="test:replay-overflow")
for i in range(10):
session.add_message("user", f"u{i}")
session.add_message("assistant", f"a{i}")
consolidator.sessions._session_cache[session.key] = session
consolidator.estimate_session_prompt_tokens = MagicMock(return_value=(100, "tiktoken"))
consolidator.archive = AsyncMock(return_value="old conversation summary")
await consolidator.maybe_consolidate_by_tokens(
session,
runtime=runtime,
replay_max_messages=6,
)
archived_chunk = consolidator.archive.await_args.args[0]
assert archived_chunk[0]["content"] == "u0"
assert archived_chunk[-1]["content"] == "a6"
assert session.last_consolidated == 14
assert session.metadata["_last_summary"]["text"] == "old conversation summary"
consolidator.sessions.save.assert_called()
async def test_replay_window_overflow_extends_to_long_recent_user_turn(
self,
consolidator,
runtime,
):
"""Replay-window consolidation must not cut into the latest user turn."""
session = Session(key="test:replay-tool-boundary")
session.add_message("user", "old")
session.add_message("assistant", "old answer")
session.add_message("user", "record this")
for i in range(4):
session.messages.extend(_tool_round(f"call-{i}"))
session.add_message("assistant", "final answer")
consolidator.sessions._session_cache[session.key] = session
consolidator.estimate_session_prompt_tokens = MagicMock(return_value=(100, "tiktoken"))
consolidator.archive = AsyncMock(return_value="tool turn summary")
await consolidator.maybe_consolidate_by_tokens(
session,
runtime=runtime,
replay_max_messages=4,
)
archived_chunk = consolidator.archive.await_args.args[0]
assert [m["content"] for m in archived_chunk] == ["old", "old answer"]
assert session.last_consolidated == 2
history = session.get_history(max_messages=4, extend_to_user=True)
assert len(history) > 4
assert history[0]["content"] == "record this"
assert history[-1]["content"] == "final answer"
async def test_replay_window_overflow_uses_newer_user_inside_window(
self,
consolidator,
runtime,
):
"""Do not extend to an older long turn when the hard window has a newer user."""
session = Session(key="test:replay-newer-user")
session.add_message("user", "old")
session.add_message("assistant", "old answer")
session.add_message("user", "long older turn")
for i in range(8):
session.messages.extend(_tool_round(f"older-{i}"))
session.add_message("assistant", "older final")
session.add_message("user", "new question")
session.add_message("assistant", "new answer")
consolidator.sessions._session_cache[session.key] = session
consolidator.estimate_session_prompt_tokens = MagicMock(return_value=(100, "tiktoken"))
consolidator.archive = AsyncMock(return_value="older turn summary")
await consolidator.maybe_consolidate_by_tokens(
session,
runtime=runtime,
replay_max_messages=6,
)
archived_chunk = consolidator.archive.await_args.args[0]
assert archived_chunk[2]["content"] == "long older turn"
assert archived_chunk[-1]["content"] == "older final"
assert session.last_consolidated == len(session.messages) - 2
history = session.get_history(max_messages=6, extend_to_user=True)
assert [m["content"] for m in history] == ["new question", "new answer"]
async def test_large_chunk_archived_without_cap(self, consolidator, runtime):
"""Without chunk cap, the full range from pick_consolidation_boundary is archived."""
consolidator._SAFETY_BUFFER = 0
session = MagicMock()
session.last_consolidated = 0
session.key = "test:key"
session.messages = [
{
"role": "user" if i in {0, 50, 61} else "assistant",
"content": f"m{i}",
}
for i in range(70)
]
consolidator.sessions._session_cache[session.key] = session
consolidator.estimate_session_prompt_tokens = MagicMock(
side_effect=[(1200, "tiktoken"), (400, "tiktoken")]
)
# Use real pick_consolidation_boundary — it will find boundary at idx=50
# (user message at 50, token budget met)
consolidator.archive = AsyncMock(return_value=True)
await consolidator.maybe_consolidate_by_tokens(session, runtime=runtime)
archived_chunk = consolidator.archive.await_args.args[0]
# pick_consolidation_boundary returns (50, tokens) — user turn at idx 50
assert archived_chunk[0]["content"] == "m0"
assert session.last_consolidated > 0
async def test_raw_archive_fallback_advances_last_consolidated(
self, consolidator, runtime
):
"""When archive() falls back to raw-archive (LLM failed), the cursor
must still advance. Otherwise the same chunk gets raw-archived again
on every subsequent maybe_consolidate_by_tokens() call, spamming
duplicate [RAW] entries into history.jsonl."""
consolidator._SAFETY_BUFFER = 0
session = MagicMock()
session.last_consolidated = 0
session.key = "test:key"
session.messages = [
{"role": "user" if i in {0, 50} else "assistant", "content": f"m{i}"}
for i in range(70)
]
session.metadata = {}
consolidator.sessions._session_cache[session.key] = session
consolidator.estimate_session_prompt_tokens = MagicMock(
side_effect=[(1200, "tiktoken"), (400, "tiktoken")]
)
# LLM consolidation fails — archive() returns None (raw_archive fired).
consolidator.archive = AsyncMock(return_value=None)
await consolidator.maybe_consolidate_by_tokens(session, runtime=runtime)
consolidator.archive.assert_awaited_once()
# The chunk is considered "materialized" (as a raw-archive breadcrumb),
# so last_consolidated must have moved past it.
assert session.last_consolidated == 50
async def test_raw_archive_fallback_breaks_round_loop(
self, consolidator, runtime
):
"""A degraded LLM should not trigger more archive() calls within the
same maybe_consolidate_by_tokens invocation — bail after one fallback."""
consolidator._SAFETY_BUFFER = 0
session = MagicMock()
session.last_consolidated = 0
session.key = "test:key"
session.messages = [
{"role": "user" if i in {0, 20, 40, 60} else "assistant", "content": f"m{i}"}
for i in range(70)
]
session.metadata = {}
consolidator.sessions._session_cache[session.key] = session
# Keep estimates high so the loop would otherwise run multiple rounds.
consolidator.estimate_session_prompt_tokens = MagicMock(
return_value=(1200, "tiktoken")
)
consolidator.archive = AsyncMock(return_value=None)
await consolidator.maybe_consolidate_by_tokens(session, runtime=runtime)
# Exactly one fallback per call — not _MAX_CONSOLIDATION_ROUNDS.
assert consolidator.archive.await_count == 1
async def test_boundary_respected_when_no_intermediate_user_turn(
self, consolidator, runtime
):
"""When boundary points past a long tool chain, the full chunk is archived."""
consolidator._SAFETY_BUFFER = 0
session = MagicMock()
session.last_consolidated = 0
session.key = "test:key"
session.messages = [
{
"role": "user" if i in {0, 61} else "assistant",
"content": f"m{i}",
}
for i in range(70)
]
consolidator.sessions._session_cache[session.key] = session
consolidator.estimate_session_prompt_tokens = MagicMock(
side_effect=[(1200, "tiktoken"), (400, "tiktoken")]
)
consolidator.archive = AsyncMock(return_value=True)
await consolidator.maybe_consolidate_by_tokens(session, runtime=runtime)
consolidator.archive.assert_awaited_once()
# pick_consolidation_boundary finds the only boundary at idx=61
assert session.last_consolidated == 61
class TestCompactIdleSession:
"""Tests for Consolidator.compact_idle_session — lock-protected idle truncation."""
@pytest.fixture
def real_consolidator(self, store, mock_provider):
"""Create a Consolidator with a real SessionManager (not a mock)."""
from nanobot.session.manager import SessionManager
sessions = SessionManager(store.workspace)
return Consolidator(
store=store,
sessions=sessions,
build_messages=MagicMock(return_value=[]),
get_tool_definitions=MagicMock(return_value=[]),
)
@pytest.mark.asyncio
async def test_archives_prefix_keeps_suffix(
self, real_consolidator, mock_provider, runtime
):
"""20 user/assistant turns → compact with max_suffix=8 → messages ≤ 8,
last_consolidated=0, _last_summary stored."""
mock_provider.chat_with_retry.return_value = MagicMock(
content="Summary of old conversation.", finish_reason="stop"
)
sessions = real_consolidator.sessions
session = sessions.get_or_create("cli:test")
old_ts = session.updated_at
for i in range(20):
session.add_message("user", f"user msg {i}")
session.add_message("assistant", f"assistant msg {i}")
session.updated_at = old_ts
sessions.save(session)
result = await real_consolidator.compact_idle_session(
"cli:test", runtime=runtime, max_suffix=8
)
assert result == "Summary of old conversation."
reloaded = sessions.get_or_create("cli:test")
assert len(reloaded.messages) <= 8
assert reloaded.last_consolidated == 0
meta = reloaded.metadata.get("_last_summary")
assert meta is not None
assert meta["text"] == "Summary of old conversation."
assert "last_active" in meta
assert reloaded.updated_at == old_ts
@pytest.mark.asyncio
async def test_summarizes_retained_suffix_not_just_dropped_prefix(
self, real_consolidator, mock_provider, runtime
):
"""idleCompact must summarize over the full unconsolidated tail, including
the recent suffix it retains. Otherwise a late user correction / final
result that lands in the kept suffix is excluded from the persisted
summary, leaving a stale wrong conclusion in history. Regression for #4264."""
mock_provider.chat_with_retry.return_value = MagicMock(
content="Summary.", finish_reason="stop"
)
sessions = real_consolidator.sessions
session = sessions.get_or_create("cli:correction")
for i in range(18):
session.add_message("user", f"user msg {i}")
session.add_message("assistant", f"assistant msg {i}")
# Final correction exchange lands inside the retained max_suffix window.
session.add_message("user", "no, that's wrong, use approach B")
session.add_message("assistant", "CORRECTED_FINAL_RESULT_alpha")
sessions.save(session)
await real_consolidator.compact_idle_session(
"cli:correction", runtime=runtime, max_suffix=8
)
summarized = mock_provider.chat_with_retry.call_args.kwargs["messages"][1]["content"]
assert "CORRECTED_FINAL_RESULT_alpha" in summarized
@pytest.mark.asyncio
async def test_raw_dumps_only_dropped_messages_on_llm_failure(
self, real_consolidator, mock_provider, store, runtime
):
"""Summarizing over the full tail must not widen what gets raw-dumped on
LLM failure: the breadcrumb should contain only the removed prefix, not
the retained suffix that stays live in the session. Regression for #4264."""
mock_provider.chat_with_retry.side_effect = RuntimeError("LLM unavailable")
sessions = real_consolidator.sessions
session = sessions.get_or_create("cli:rawdrop")
for i in range(18):
session.add_message("user", f"user msg {i}")
session.add_message("assistant", f"assistant msg {i}")
session.add_message("user", "final user follow-up")
session.add_message("assistant", "RETAINED_SUFFIX_marker")
sessions.save(session)
await real_consolidator.compact_idle_session(
"cli:rawdrop", runtime=runtime, max_suffix=8
)
raw = "\n".join(e["content"] for e in store.read_unprocessed_history(since_cursor=0))
assert "[RAW]" in raw
assert "user msg 0" in raw # removed prefix is the breadcrumb
assert "RETAINED_SUFFIX_marker" not in raw # retained suffix not dumped
@pytest.mark.asyncio
async def test_idle_compact_writes_session_key_to_history(
self,
real_consolidator,
mock_provider,
store,
runtime,
):
mock_provider.chat_with_retry.return_value = MagicMock(
content="Summary of old conversation.", finish_reason="stop"
)
session = real_consolidator.sessions.get_or_create("cli:test")
for i in range(10):
session.add_message("user", f"user msg {i}")
session.add_message("assistant", f"assistant msg {i}")
real_consolidator.sessions.save(session)
await real_consolidator.compact_idle_session(
"cli:test", runtime=runtime, max_suffix=4
)
entries = store.read_unprocessed_history(since_cursor=0)
assert entries[0]["session_key"] == "cli:test"
@pytest.mark.asyncio
async def test_empty_session_does_not_refresh_timestamp(
self, real_consolidator, runtime
):
"""Empty session with old updated_at does not look active after compaction."""
from datetime import datetime, timedelta
sessions = real_consolidator.sessions
session = sessions.get_or_create("cli:empty")
old_ts = datetime.now() - timedelta(hours=2)
session.updated_at = old_ts
sessions.save(session)
result = await real_consolidator.compact_idle_session(
"cli:empty", runtime=runtime
)
assert result == ""
reloaded = sessions.get_or_create("cli:empty")
assert reloaded.updated_at == old_ts
assert reloaded.metadata == {}
@pytest.mark.asyncio
async def test_nothing_summary_not_stored(
self, real_consolidator, mock_provider, runtime
):
"""LLM returns '(nothing)' → _last_summary NOT in metadata."""
mock_provider.chat_with_retry.return_value = MagicMock(
content="(nothing)", finish_reason="stop"
)
sessions = real_consolidator.sessions
session = sessions.get_or_create("cli:nothing")
for i in range(10):
session.add_message("user", f"u{i}")
session.add_message("assistant", f"a{i}")
sessions.save(session)
result = await real_consolidator.compact_idle_session(
"cli:nothing", runtime=runtime, max_suffix=4
)
assert result == "(nothing)"
reloaded = sessions.get_or_create("cli:nothing")
assert "_last_summary" not in reloaded.metadata
@pytest.mark.asyncio
async def test_llm_failure_still_truncates(
self, real_consolidator, mock_provider, store, runtime
):
"""LLM raises RuntimeError → raw_archive fires, session still truncated, returns None."""
mock_provider.chat_with_retry.side_effect = RuntimeError("LLM unavailable")
sessions = real_consolidator.sessions
session = sessions.get_or_create("cli:fail")
for i in range(10):
session.add_message("user", f"u{i}")
session.add_message("assistant", f"a{i}")
sessions.save(session)
result = await real_consolidator.compact_idle_session(
"cli:fail", runtime=runtime, max_suffix=4
)
assert result is None
# raw_archive should have been called (history.jsonl gets an entry)
entries = store.read_unprocessed_history(since_cursor=0)
assert any("[RAW]" in e["content"] for e in entries)
# Session should still be truncated
reloaded = sessions.get_or_create("cli:fail")
assert len(reloaded.messages) <= 4
@pytest.mark.asyncio
async def test_respects_last_consolidated(
self, real_consolidator, mock_provider, runtime
):
"""30 turns with last_consolidated=50 → only unconsolidated tail considered."""
mock_provider.chat_with_retry.return_value = MagicMock(
content="Tail summary.", finish_reason="stop"
)
sessions = real_consolidator.sessions
session = sessions.get_or_create("cli:offset")
for i in range(30):
session.add_message("user", f"u{i}")
session.add_message("assistant", f"a{i}")
session.last_consolidated = 50 # Only 10 messages unconsolidated
sessions.save(session)
result = await real_consolidator.compact_idle_session(
"cli:offset", runtime=runtime, max_suffix=4
)
assert result == "Tail summary."
# Verify only the unconsolidated tail was processed:
# 10 unconsolidated messages (50-59), keep suffix of 4 → archive 6
archived_call = mock_provider.chat_with_retry.call_args
user_content = archived_call.kwargs["messages"][1]["content"]
# Should contain only tail messages, not early ones
assert "u0" not in user_content
assert "u25" in user_content or "a25" in user_content
@pytest.mark.asyncio
async def test_non_contiguous_suffix_archives_actual_dropped_messages(
self,
real_consolidator,
mock_provider,
runtime,
):
"""Assistant-only tails extend back to the latest user turn, so archive
the actual dropped messages rather than a computed prefix."""
mock_provider.chat_with_retry.return_value = MagicMock(
content="Tail summary.", finish_reason="stop"
)
sessions = real_consolidator.sessions
session = sessions.get_or_create("cli:noncontiguous")
for i in range(15):
session.add_message("user", f"user-{i:02d}")
for i in range(10):
session.add_message("assistant", f"assistant-{i:02d}")
sessions.save(session)
result = await real_consolidator.compact_idle_session(
"cli:noncontiguous", runtime=runtime, max_suffix=6
)
assert result == "Tail summary."
reloaded = sessions.get_or_create("cli:noncontiguous")
assert [m["content"] for m in reloaded.messages] == [
"user-14",
"assistant-00",
"assistant-01",
"assistant-02",
"assistant-03",
"assistant-04",
"assistant-05",
"assistant-06",
"assistant-07",
"assistant-08",
"assistant-09",
]
# #4264: idle compaction now summarizes the full unconsolidated tail, so
# the dropped head (user-00) and retained suffix (user-14 through
# assistant-09) are all summarized.
archived_call = mock_provider.chat_with_retry.call_args
user_content = archived_call.kwargs["messages"][1]["content"]
assert "user-00" in user_content
assert "assistant-09" in user_content
assert "user-14" in user_content
@pytest.mark.asyncio
async def test_acquires_consolidation_lock(
self, real_consolidator, mock_provider, runtime
):
"""Verify lock is held during execution."""
import asyncio
# Use a slow LLM response to ensure the lock is held while we check
started = asyncio.Event()
release_chat = asyncio.Event()
async def slow_chat(**kwargs):
started.set()
await release_chat.wait()
return LLMResponse(content="Summary.", finish_reason="stop")
mock_provider.chat_with_retry = slow_chat
sessions = real_consolidator.sessions
session = sessions.get_or_create("cli:lock")
for i in range(10):
session.add_message("user", f"u{i}")
session.add_message("assistant", f"a{i}")
sessions.save(session)
lock = real_consolidator.get_lock("cli:lock")
assert not lock.locked()
task = asyncio.ensure_future(
real_consolidator.compact_idle_session(
"cli:lock", runtime=runtime, max_suffix=4
)
)
await started.wait()
assert lock.locked()
release_chat.set()
await task
assert not lock.locked()
class TestConsolidatorSessionRefresh:
"""Background consolidation must detect stale session references."""
@pytest.mark.asyncio
async def test_reloads_before_empty_session_guard(self, tmp_path):
"""A stale empty reference must not skip a non-empty cached session."""
from nanobot.agent.memory import Consolidator, MemoryStore
from nanobot.session.manager import Session, SessionManager
store = MemoryStore(tmp_path)
provider = MagicMock()
provider.chat_with_retry = AsyncMock(
return_value=MagicMock(content="summary", finish_reason="stop")
)
provider.generation = GenerationSettings(max_tokens=4096)
provider.estimate_prompt_tokens = MagicMock(return_value=(10, "test"))
runtime = LLMRuntime.capture(
provider,
"test-model",
context_window_tokens=128_000,
)
sessions = SessionManager(tmp_path)
consolidator = Consolidator(
store=store,
sessions=sessions,
build_messages=MagicMock(return_value=[]),
get_tool_definitions=MagicMock(return_value=[]),
)
fresh = sessions.get_or_create("cli:test")
fresh.add_message("user", "fresh message")
sessions.save(fresh)
stale_empty = Session(key="cli:test")
seen: dict[str, Session] = {}
def estimate(session: Session, *, runtime):
seen["session"] = session
return 10, "test"
consolidator.estimate_session_prompt_tokens = MagicMock(side_effect=estimate)
await consolidator.maybe_consolidate_by_tokens(
stale_empty,
runtime=runtime,
)
assert seen["session"] is fresh
@pytest.mark.asyncio
async def test_reloads_stale_session_after_compact(self, tmp_path):
"""After compact_idle_session replaces the session, a concurrent
maybe_consolidate_by_tokens with the old reference should use the
fresh session from cache instead of overwriting."""
from nanobot.agent.memory import Consolidator, MemoryStore
from nanobot.session.manager import SessionManager
store = MemoryStore(tmp_path)
provider = MagicMock()
provider.chat_with_retry = AsyncMock(
return_value=MagicMock(content="summary", finish_reason="stop")
)
provider.generation = GenerationSettings(max_tokens=4096)
provider.estimate_prompt_tokens = MagicMock(return_value=(10, "test"))
runtime = LLMRuntime.capture(
provider,
"test-model",
context_window_tokens=128_000,
)
sessions = SessionManager(tmp_path)
consolidator = Consolidator(
store=store,
sessions=sessions,
build_messages=MagicMock(return_value=[]),
get_tool_definitions=MagicMock(return_value=[]),
)
# Populate session with many messages
session = sessions.get_or_create("cli:test")
for i in range(20):
session.add_message("user", f"u{i}")
session.add_message("assistant", f"a{i}")
sessions.save(session)
# Simulate: background consolidation captures old reference
old_ref = session
# AutoCompact runs first and truncates to 8
await consolidator.compact_idle_session(
"cli:test",
runtime=runtime,
max_suffix=8,
)
# Background consolidation runs with stale reference —
# should detect the session was replaced and not undo the compact.
await consolidator.maybe_consolidate_by_tokens(
old_ref,
runtime=runtime,
)
session_after = sessions.get_or_create("cli:test")
# Messages should still be truncated (not restored to 40)
assert len(session_after.messages) <= 8
class TestRawArchiveTruncation:
"""raw_archive() must cap entry size to avoid bloating history.jsonl."""
def test_raw_archive_truncates_large_content(self, store):
"""Large messages should be truncated to _RAW_ARCHIVE_MAX_CHARS."""
big = "x" * 50_000
messages = [{"role": "user", "content": big}]
store.raw_archive(messages)
entries = store.read_unprocessed_history(since_cursor=0)
assert len(entries) == 1
assert len(entries[0]["content"]) < 50_000
assert "[RAW]" in entries[0]["content"]
def test_raw_archive_preserves_small_content(self, store):
"""Small messages should not be truncated."""
messages = [{"role": "user", "content": "hello"}]
store.raw_archive(messages)
entries = store.read_unprocessed_history(since_cursor=0)
assert len(entries) == 1
assert "hello" in entries[0]["content"]
def test_raw_archive_excludes_model_only_runtime_context(self, store):
content, marker = append_runtime_context(
"ship the feature",
[RuntimeContextBlock(source="goal", content="host-only goal guidance")],
)
store.raw_archive([{
"role": "user",
"content": content,
RUNTIME_CONTEXT_HISTORY_META: marker,
}])
entry = store.read_unprocessed_history(since_cursor=0)[0]["content"]
assert "ship the feature" in entry
assert "host-only goal guidance" not in entry
def test_raw_archive_preserves_session_key(self, store):
messages = [{"role": "user", "content": "hello"}]
store.raw_archive(messages, session_key="websocket:chat-1")
entries = store.read_unprocessed_history(since_cursor=0)
assert entries[0]["session_key"] == "websocket:chat-1"
def test_raw_archive_custom_max_chars(self, store):
"""max_chars parameter should override default limit."""
messages = [{"role": "user", "content": "a" * 200}]
store.raw_archive(messages, max_chars=100)
entries = store.read_unprocessed_history(since_cursor=0)
assert len(entries[0]["content"]) < 200
class TestArchiveTruncation:
"""archive() must truncate formatted text before sending to consolidation LLM."""
async def test_archive_truncates_large_formatted_text(
self, consolidator, mock_provider, store, runtime
):
"""Large formatted text should be truncated to token budget before LLM call."""
# context_window_tokens=1000, max_completion_tokens=100, _SAFETY_BUFFER=1024
# budget = 1000 - 100 - 1024 = -124 → fallback via truncate_text(budget*4)
big_messages = [{"role": "user", "content": "x" * 100_000}]
mock_provider.chat_with_retry.return_value = MagicMock(
content="Summary of large input.", finish_reason="stop"
)
await consolidator.archive(big_messages, runtime=runtime)
call_args = mock_provider.chat_with_retry.call_args
user_content = call_args.kwargs["messages"][1]["content"]
# Should be significantly shorter than 100K
assert len(user_content) < 50_000
async def test_archive_truncates_with_small_token_budget(
self, consolidator, mock_provider, store, runtime
):
"""Small context window: truncation uses actual tokenizer count."""
runtime = replace(runtime, context_window_tokens=500)
big_messages = [{"role": "user", "content": "word " * 50_000}]
mock_provider.chat_with_retry.return_value = MagicMock(
content="Summary.", finish_reason="stop"
)
await consolidator.archive(big_messages, runtime=runtime)
sent_messages = mock_provider.chat_with_retry.call_args.kwargs["messages"]
user_content = sent_messages[1]["content"]
# budget = 500 - 100 - 1024 = negative, fallback char-based
# Should be truncated
assert len(user_content) < 250_000
async def test_oversized_summary_is_capped_before_append(
self, consolidator, mock_provider, store, runtime
):
"""A pathologically large LLM summary must not land full-length in
history.jsonl — that would re-open the #3412 bloat vector from the
*success* path instead of the fallback path."""
mock_provider.chat_with_retry.return_value = MagicMock(
content="S" * (_ARCHIVE_SUMMARY_MAX_CHARS * 10),
finish_reason="stop",
)
await consolidator.archive(
[{"role": "user", "content": "hi"}],
runtime=runtime,
)
entry = store.read_unprocessed_history(since_cursor=0)[0]
assert len(entry["content"]) <= _ARCHIVE_SUMMARY_MAX_CHARS + 50
async def test_archive_truncates_via_tiktoken_with_positive_budget(
self, consolidator, mock_provider, store, runtime
):
"""Positive token budget should use tiktoken for precise truncation."""
runtime = replace(runtime, context_window_tokens=10_000)
consolidator._SAFETY_BUFFER = 0
# budget = 10000 - 100 - 0 = 9900 tokens
big_messages = [{"role": "user", "content": "word " * 50_000}]
mock_provider.chat_with_retry.return_value = MagicMock(
content="Summary.", finish_reason="stop"
)
await consolidator.archive(big_messages, runtime=runtime)
import tiktoken
enc = tiktoken.get_encoding("cl100k_base")
sent_content = mock_provider.chat_with_retry.call_args.kwargs["messages"][1]["content"]
token_count = len(enc.encode(sent_content))
assert token_count <= 9_900