strix/tests/test_budget_pause_policy.py
Ahmed Allam a0f8ea2cd3
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fix(core): a parked agent keeps its pause reason and drains queued messages on resume
BudgetPausedError carries whether the operator pause caused it, so a resume that lands between the hook's refusal and the loop's handler still parks and continues instead of exiting under the stop policy. After the resume the agent drains its mailbox into the session before retrying the call, so a message queued while it was held is not skipped.
2026-10-18 14:58:16 +03:00

683 lines
26 KiB
Python

"""``budget_policy="pause"``: agents park before a paid call and never hear about budgets."""
from __future__ import annotations
import asyncio
from typing import TYPE_CHECKING, Any
from unittest.mock import MagicMock, patch
import pytest
from strix.core import execution
from strix.core.agents import AgentCoordinator
from strix.core.execution import _start_child_runner, run_agent_loop
from strix.core.hooks import (
BudgetExceededError,
BudgetPausedError,
ReportUsageHooks,
recomputed_budget_flags,
)
from strix.core.sessions import open_agent_session
if TYPE_CHECKING:
from collections.abc import AsyncIterator, Awaitable, Callable
from pathlib import Path
COST_PER_CALL = 1.0
_CALL_LATENCY_S = 0.005
class _FakeLedger:
def __init__(self) -> None:
self.on_pause: Callable[[], Awaitable[None]] | None = None
self.cost = 0.0
self.calls: list[str] = []
self.remaining: dict[str, int] = {}
self.warned_inputs: list[list[Any]] = []
self.gate: asyncio.Event | None = None
self.in_flight = 0
def record_sdk_usage(self, **_kwargs: Any) -> None:
return
def get_total_llm_cost(self) -> float:
return self.cost
class _FakeStream:
"""One ``Runner.run_streamed`` call: several LLM turns, each guarded by the hooks.
Mirrors the SDK's ordering: ``on_llm_start`` runs before the paid request,
``on_llm_end`` after it. A ``BudgetPausedError`` from ``on_llm_start`` ends
the stream without spending, exactly like the SDK surfacing a hook error.
"""
def __init__(
self,
*,
ledger: _FakeLedger,
hooks: ReportUsageHooks,
context: dict[str, Any],
agent: Any,
coordinator: AgentCoordinator,
) -> None:
self._ledger = ledger
self._hooks = hooks
self._context = context
self._agent = agent
self._coordinator = coordinator
self.run_loop_exception: BaseException | None = None
self.final_output = None
async def stream_events(self) -> AsyncIterator[Any]:
agent_id = str(self._context.get("agent_id"))
ctx_wrapper = MagicMock()
ctx_wrapper.context = self._context
while self._ledger.remaining.get(agent_id, 0) > 0:
input_items: list[Any] = []
try:
await self._hooks.on_llm_start(ctx_wrapper, self._agent, None, input_items)
except BudgetPausedError as exc:
self.run_loop_exception = exc
if self._ledger.on_pause is not None:
await self._ledger.on_pause()
return
self._ledger.warned_inputs.append(input_items)
if self._ledger.gate is not None:
self._ledger.in_flight += 1
await self._ledger.gate.wait()
self._ledger.in_flight -= 1
self._ledger.cost += COST_PER_CALL
self._ledger.calls.append(agent_id)
self._ledger.remaining[agent_id] -= 1
await self._hooks.on_llm_end(ctx_wrapper, self._agent, MagicMock())
await asyncio.sleep(_CALL_LATENCY_S)
if self._coordinator.statuses.get(agent_id) == "running":
await self._coordinator.set_status(agent_id, "completed")
items: tuple[Any, ...] = ()
for item in items:
yield item
def cancel(self, mode: str = "immediate") -> None: # noqa: ARG002
return
def _fake_runner(ledger: _FakeLedger, coordinator: AgentCoordinator) -> Any:
class _FakeRunner:
@staticmethod
def run_streamed(
agent: Any,
input: Any, # noqa: A002, ARG004
*,
run_config: Any, # noqa: ARG004
context: dict[str, Any],
max_turns: int, # noqa: ARG004
session: Any, # noqa: ARG004
hooks: ReportUsageHooks,
) -> _FakeStream:
return _FakeStream(
ledger=ledger,
hooks=hooks,
context=context,
agent=agent,
coordinator=coordinator,
)
return _FakeRunner
async def _noop_compact(*_args: Any, **_kwargs: Any) -> bool:
return False
async def _wait_until(predicate: Callable[[], bool], *, timeout: float = 5.0) -> None:
async def _poll() -> None:
while not predicate():
await asyncio.sleep(0.001)
await asyncio.wait_for(_poll(), timeout=timeout)
def _all_parked(coordinator: AgentCoordinator, *agent_ids: str) -> bool:
return all(coordinator.statuses.get(aid) == "budget_paused" for aid in agent_ids)
class _Scan:
"""Root + children driven through the real non-interactive loops."""
def __init__(
self,
tmp_path: Path,
monkeypatch: pytest.MonkeyPatch,
*,
max_budget_usd: float | None,
budget_policy: str = "pause",
) -> None:
self.ledger = _FakeLedger()
self.hooks = ReportUsageHooks(
model="test-model",
max_budget_usd=max_budget_usd,
budget_policy=budget_policy, # type: ignore[arg-type]
)
self.coordinator = AgentCoordinator()
self.coordinator.set_budget_policy(budget_policy) # type: ignore[arg-type]
self.coordinator.set_budget_limit_setter(self.hooks.set_max_budget_usd)
monkeypatch.setattr(execution, "Runner", _fake_runner(self.ledger, self.coordinator))
monkeypatch.setattr(execution, "_compact_session", _noop_compact)
self.db_path = tmp_path / "agents.sqlite"
self.sessions: list[Any] = []
self.run_config = MagicMock()
self.root_ctx: dict[str, Any] = {
"agent_id": "root",
"parent_id": None,
"coordinator": self.coordinator,
}
self.root_task: asyncio.Task[Any] | None = None
async def start_root(self, *, calls: int) -> None:
self.ledger.remaining["root"] = calls
await self.coordinator.register("root", "strix", parent_id=None)
session = open_agent_session("root", self.db_path)
self.sessions.append(session)
self.root_task = asyncio.create_task(
run_agent_loop(
agent=MagicMock(),
initial_input=[],
run_config=self.run_config,
context=self.root_ctx,
max_turns=500,
coordinator=self.coordinator,
agent_id="root",
interactive=False,
session=session,
hooks=self.hooks,
)
)
async def start_child(self, child_id: str, *, calls: int) -> None:
self.ledger.remaining[child_id] = calls
await self.coordinator.register(child_id, "recon", parent_id="root")
await _start_child_runner(
parent_ctx=self.root_ctx,
coordinator=self.coordinator,
agents_db_path=self.db_path,
sessions_to_close=self.sessions,
run_config=self.run_config,
max_turns=500,
interactive=False,
child_agent=MagicMock(),
child_id=child_id,
name=f"recon-{child_id}",
parent_id="root",
task="probe things",
initial_input=[],
hooks=self.hooks,
)
def tasks(self) -> list[asyncio.Task[Any]]:
tasks = [self.root_task] if self.root_task is not None else []
tasks.extend(rt.task for rt in self.coordinator.runtimes.values() if rt.task is not None)
return tasks
async def teardown(self) -> None:
for task in self.tasks():
task.cancel()
await asyncio.gather(*self.tasks(), return_exceptions=True)
for session in self.sessions:
session.close()
@pytest.mark.asyncio
async def test_pause_policy_parks_every_agent_at_the_limit_and_resumes_in_place(
tmp_path: Path, monkeypatch: pytest.MonkeyPatch
) -> None:
scan = _Scan(tmp_path, monkeypatch, max_budget_usd=5.0)
agents = ("root", "child-a", "child-b")
with patch("strix.core.hooks.get_global_report_state", return_value=scan.ledger):
await scan.start_root(calls=100)
await scan.start_child("child-a", calls=100)
await scan.start_child("child-b", calls=100)
await _wait_until(lambda: _all_parked(scan.coordinator, *agents))
assert scan.ledger.cost == pytest.approx(5.0)
assert len(scan.ledger.calls) == 5
assert scan.coordinator.budget_paused is False
assert scan.coordinator.budget_stopped is False
assert scan.coordinator.reserve_stopped is False
assert all(not task.done() for task in scan.tasks())
woken = await scan.coordinator.resume_budget(max_budget_usd=8.0)
assert sorted(woken) == sorted(agents)
assert scan.hooks.max_budget_usd == 8.0
await _wait_until(lambda: scan.ledger.cost >= 8.0)
await _wait_until(lambda: _all_parked(scan.coordinator, *agents))
assert scan.ledger.cost == pytest.approx(8.0)
await scan.coordinator.resume_budget(max_budget_usd=9.0)
await _wait_until(lambda: scan.ledger.cost >= 9.0)
await _wait_until(lambda: _all_parked(scan.coordinator, *agents))
assert scan.ledger.cost == pytest.approx(9.0)
assert len(scan.ledger.calls) == 9
assert all(not task.done() for task in scan.tasks())
# The model never saw a budget message: no warning band, no resume note.
assert scan.ledger.warned_inputs
assert all(items == [] for items in scan.ledger.warned_inputs)
for session in scan.sessions:
assert await session.get_items() == []
# Stop while parked: an individual stop wakes that loop and it exits.
child_a_task = scan.coordinator.runtimes["child-a"].task
assert child_a_task is not None
await scan.coordinator.request_stop("child-a")
await asyncio.wait_for(child_a_task, timeout=5.0)
assert scan.coordinator.statuses["child-a"] == "stopped"
assert scan.coordinator.statuses["root"] == "budget_paused"
assert scan.coordinator.statuses["child-b"] == "budget_paused"
# A scan-wide cancel while parked tears the rest down cleanly.
await scan.teardown()
assert all(task.done() for task in scan.tasks())
assert scan.ledger.cost == pytest.approx(9.0)
@pytest.mark.asyncio
async def test_pause_policy_operator_pause_and_resume_without_a_limit(
tmp_path: Path, monkeypatch: pytest.MonkeyPatch
) -> None:
scan = _Scan(tmp_path, monkeypatch, max_budget_usd=None)
agents = ("root", "child-a", "child-b")
with patch("strix.core.hooks.get_global_report_state", return_value=scan.ledger):
await scan.start_root(calls=6)
await scan.start_child("child-a", calls=6)
await scan.start_child("child-b", calls=6)
await _wait_until(lambda: scan.ledger.cost >= 3.0)
await scan.coordinator.pause_budget()
spent_at_pause = scan.ledger.cost
await _wait_until(lambda: _all_parked(scan.coordinator, *agents))
await _wait_until(lambda: scan.coordinator.budget_paused, timeout=0.1)
assert scan.ledger.cost == pytest.approx(spent_at_pause)
assert all(not task.done() for task in scan.tasks())
await asyncio.sleep(0.05)
assert scan.ledger.cost == pytest.approx(spent_at_pause)
woken = await scan.coordinator.resume_budget()
assert sorted(woken) == sorted(agents)
await _wait_until(lambda: not scan.coordinator.budget_paused, timeout=0.1)
await asyncio.wait_for(asyncio.gather(*scan.tasks(), return_exceptions=True), timeout=5.0)
assert scan.ledger.cost == pytest.approx(18.0)
assert {aid: str(s) for aid, s in scan.coordinator.statuses.items()} == {
"root": "completed",
"child-a": "completed",
"child-b": "completed",
}
assert all(items == [] for items in scan.ledger.warned_inputs)
for session in scan.sessions:
session.close()
@pytest.mark.asyncio
async def test_pause_policy_keeps_in_flight_overshoot(
tmp_path: Path, monkeypatch: pytest.MonkeyPatch
) -> None:
scan = _Scan(tmp_path, monkeypatch, max_budget_usd=1.0)
scan.ledger.gate = asyncio.Event()
await scan.coordinator.register("root", "strix", parent_id=None)
with patch("strix.core.hooks.get_global_report_state", return_value=scan.ledger):
await scan.start_child("child-a", calls=100)
await scan.start_child("child-b", calls=100)
# Both calls were dispatched under the limit; neither is cancelled.
await _wait_until(lambda: scan.ledger.in_flight == 2)
assert scan.ledger.cost == 0.0
scan.ledger.gate.set()
await _wait_until(lambda: _all_parked(scan.coordinator, "child-a", "child-b"))
assert scan.ledger.cost == pytest.approx(2.0)
assert scan.hooks.max_budget_usd is not None
assert scan.ledger.cost > scan.hooks.max_budget_usd
assert scan.coordinator.budget_stopped is False
assert all(not task.done() for task in scan.tasks())
# Resuming at a limit that is already spent parks again without a call.
await scan.coordinator.resume_budget(max_budget_usd=1.5)
await asyncio.sleep(0.05)
await _wait_until(lambda: _all_parked(scan.coordinator, "child-a", "child-b"))
assert scan.ledger.cost == pytest.approx(2.0)
await scan.teardown()
@pytest.mark.asyncio
async def test_resume_between_park_decision_and_wait_is_not_missed() -> None:
coordinator = AgentCoordinator()
coordinator.set_budget_policy("pause")
await coordinator.register("a", "strix", parent_id=None)
parked_epoch = coordinator.resume_epoch
await coordinator.park_for_budget("a")
assert _all_parked(coordinator, "a")
await coordinator.resume_budget()
await asyncio.wait_for(
coordinator.wait_for_budget_resume("a", parked_epoch=parked_epoch), timeout=1.0
)
assert coordinator.statuses["a"] == "running"
@pytest.mark.asyncio
async def test_parked_wait_returns_on_stop_signals() -> None:
coordinator = AgentCoordinator()
coordinator.set_budget_policy("pause")
await coordinator.register("a", "strix", parent_id=None)
await coordinator.register("b", "recon", parent_id="a")
await coordinator.park_for_budget("a")
await coordinator.park_for_budget("b")
wait_a = asyncio.create_task(
coordinator.wait_for_budget_resume("a", parked_epoch=coordinator.resume_epoch)
)
wait_b = asyncio.create_task(
coordinator.wait_for_budget_resume("b", parked_epoch=coordinator.resume_epoch)
)
await asyncio.sleep(0.02)
assert not wait_a.done()
assert not wait_b.done()
await coordinator.request_stop("b")
await asyncio.wait_for(wait_b, timeout=1.0)
assert coordinator.statuses["b"] == "stopped"
assert not wait_a.done()
await coordinator.trigger_budget_stop()
await asyncio.wait_for(wait_a, timeout=1.0)
assert coordinator.statuses["a"] == "budget_paused"
@pytest.mark.asyncio
async def test_park_never_overwrites_a_stop_that_landed_first() -> None:
coordinator = AgentCoordinator()
coordinator.set_budget_policy("pause")
await coordinator.register("a", "strix", parent_id=None)
parked_epoch = coordinator.resume_epoch
await coordinator.request_stop("a")
assert await coordinator.park_for_budget("a") is False
assert coordinator.statuses["a"] == "stopped"
await asyncio.wait_for(
coordinator.wait_for_budget_resume("a", parked_epoch=parked_epoch), timeout=1.0
)
assert coordinator.statuses["a"] == "stopped"
@pytest.mark.asyncio
async def test_parked_children_keep_the_scan_open() -> None:
coordinator = AgentCoordinator()
coordinator.set_budget_policy("pause")
await coordinator.register("root", "strix", parent_id=None)
await coordinator.register("child", "recon", parent_id="root")
assert await coordinator.park_for_budget("child") is True
active = await coordinator.active_agents_except("root")
assert [a["agent_id"] for a in active] == ["child"]
assert active[0]["status"] == "budget_paused"
@pytest.mark.asyncio
async def test_resume_budget_replaces_the_limit_and_validates_it() -> None:
hooks = ReportUsageHooks(model="m", max_budget_usd=10.0, budget_policy="pause")
coordinator = AgentCoordinator()
coordinator.set_budget_policy("pause")
coordinator.set_budget_limit_setter(hooks.set_max_budget_usd)
await coordinator.resume_budget(max_budget_usd=25.0)
assert hooks.max_budget_usd == 25.0
await coordinator.resume_budget()
assert hooks.max_budget_usd == 25.0
with pytest.raises(ValueError, match="greater than 0"):
await coordinator.resume_budget(max_budget_usd=0.0)
with pytest.raises(ValueError, match="finite"):
await coordinator.resume_budget(max_budget_usd=float("inf"))
assert hooks.max_budget_usd == 25.0
def _ctx(coordinator: AgentCoordinator | None, *, parent_id: str | None = None) -> MagicMock:
wrapper = MagicMock()
wrapper.context = {"agent_id": "x", "parent_id": parent_id}
if coordinator is not None:
wrapper.context["coordinator"] = coordinator
return wrapper
@pytest.mark.asyncio
async def test_pause_hooks_never_warn_and_park_only_at_the_limit() -> None:
ledger = _FakeLedger()
hooks = ReportUsageHooks(model="m", max_budget_usd=10.0, budget_policy="pause")
coordinator = AgentCoordinator()
coordinator.set_budget_policy("pause")
with patch("strix.core.hooks.get_global_report_state", return_value=ledger):
for cost in (7.0, 8.5, 9.5, 9.99):
ledger.cost = cost
for parent_id in (None, "root"):
items: list[Any] = []
await hooks.on_llm_start(
_ctx(coordinator, parent_id=parent_id), MagicMock(), None, items
)
assert items == []
await hooks.on_llm_end(
_ctx(coordinator, parent_id=parent_id), MagicMock(), MagicMock()
)
ledger.cost = 10.0
await hooks.on_llm_end(_ctx(coordinator, parent_id="root"), MagicMock(), MagicMock())
with pytest.raises(BudgetPausedError) as at_limit:
await hooks.on_llm_start(_ctx(coordinator), MagicMock(), None, [])
assert at_limit.value.resume_epoch == coordinator.resume_epoch
ledger.cost = 13.7
with pytest.raises(BudgetPausedError):
await hooks.on_llm_start(_ctx(coordinator, parent_id="root"), MagicMock(), None, [])
hooks.set_max_budget_usd(20.0)
items = []
await hooks.on_llm_start(_ctx(coordinator), MagicMock(), None, items)
assert items == []
await coordinator.pause_budget()
with pytest.raises(BudgetPausedError, match="paused"):
await hooks.on_llm_start(_ctx(coordinator), MagicMock(), None, [])
@pytest.mark.asyncio
async def test_pause_hooks_do_not_count_a_parked_turn() -> None:
ledger = _FakeLedger()
ledger.cost = 10.0
hooks = ReportUsageHooks(model="m", max_budget_usd=10.0, budget_policy="pause")
coordinator = AgentCoordinator()
ctx = _ctx(coordinator)
with patch("strix.core.hooks.get_global_report_state", return_value=ledger):
with pytest.raises(BudgetPausedError):
await hooks.on_llm_start(ctx, MagicMock(), None, [])
assert "llm_turn" not in ctx.context
hooks.set_max_budget_usd(11.0)
await hooks.on_llm_start(ctx, MagicMock(), None, [])
assert ctx.context["llm_turn"] == 1
@pytest.mark.asyncio
async def test_stop_policy_is_unchanged() -> None:
ledger = _FakeLedger()
hooks = ReportUsageHooks(model="m", max_budget_usd=10.0)
assert hooks.budget_policy == "stop"
with patch("strix.core.hooks.get_global_report_state", return_value=ledger):
ledger.cost = 7.0
items: list[Any] = []
await hooks.on_llm_start(_ctx(None), MagicMock(), None, items)
assert len(items) == 1
assert "Scan cost budget" in str(items[0])
ledger.cost = 10.0
with pytest.raises(BudgetExceededError):
await hooks.on_llm_end(_ctx(None), MagicMock(), MagicMock())
assert recomputed_budget_flags(10.0, 10.0, interactive=False, budget_policy="stop") == (
True,
True,
)
assert recomputed_budget_flags(10.0, 10.0, interactive=False, budget_policy="pause") == (
False,
False,
)
def test_budget_policy_is_validated() -> None:
with pytest.raises(ValueError, match="budget_policy"):
ReportUsageHooks(model="m", budget_policy="later") # type: ignore[arg-type]
def _pause_flags(coordinator: AgentCoordinator) -> tuple[bool, bool]:
return coordinator.budget_paused, coordinator.operator_paused
@pytest.mark.asyncio
async def test_operator_pause_holds_under_the_stop_policy(
tmp_path: Path, monkeypatch: pytest.MonkeyPatch
) -> None:
scan = _Scan(tmp_path, monkeypatch, max_budget_usd=None, budget_policy="stop")
agents = ("root", "child-a", "child-b")
with patch("strix.core.hooks.get_global_report_state", return_value=scan.ledger):
await scan.start_root(calls=6)
await scan.start_child("child-a", calls=6)
await scan.start_child("child-b", calls=6)
await _wait_until(lambda: scan.ledger.cost >= 3.0)
await scan.coordinator.pause_budget()
spent_at_pause = scan.ledger.cost
await _wait_until(lambda: _all_parked(scan.coordinator, *agents))
assert _pause_flags(scan.coordinator) == (True, True)
assert all(not task.done() for task in scan.tasks())
await scan.coordinator.send("child-a", {"from": "root", "content": "status?"})
await scan.coordinator.send("root", {"from": "user", "content": "keep going"})
await asyncio.sleep(0.05)
assert _pause_flags(scan.coordinator) == (True, True)
assert scan.ledger.cost == pytest.approx(spent_at_pause)
assert _all_parked(scan.coordinator, *agents)
woken = await scan.coordinator.resume_budget()
assert sorted(woken) == sorted(agents)
assert _pause_flags(scan.coordinator) == (False, False)
await asyncio.wait_for(asyncio.gather(*scan.tasks(), return_exceptions=True), timeout=5.0)
assert scan.ledger.cost == pytest.approx(18.0)
assert {aid: str(s) for aid, s in scan.coordinator.statuses.items()} == {
"root": "completed",
"child-a": "completed",
"child-b": "completed",
}
root_items = await scan.sessions[0].get_items()
assert any("keep going" in str(item) for item in root_items)
for session in scan.sessions:
session.close()
@pytest.mark.asyncio
async def test_a_resume_that_lands_before_the_park_still_continues(
tmp_path: Path, monkeypatch: pytest.MonkeyPatch
) -> None:
scan = _Scan(tmp_path, monkeypatch, max_budget_usd=None, budget_policy="stop")
resumed = 0
async def resume_at_once() -> None:
nonlocal resumed
resumed += 1
await scan.coordinator.resume_budget()
scan.ledger.on_pause = resume_at_once
with patch("strix.core.hooks.get_global_report_state", return_value=scan.ledger):
await scan.start_root(calls=6)
await scan.start_child("child-a", calls=6)
await _wait_until(lambda: scan.ledger.cost >= 2.0)
await scan.coordinator.pause_budget()
await asyncio.wait_for(asyncio.gather(*scan.tasks(), return_exceptions=True), timeout=5.0)
assert resumed >= 1
assert _pause_flags(scan.coordinator) == (False, False)
assert scan.ledger.cost == pytest.approx(12.0)
assert {aid: str(s) for aid, s in scan.coordinator.statuses.items()} == {
"root": "completed",
"child-a": "completed",
}
for session in scan.sessions:
session.close()
@pytest.mark.asyncio
async def test_operator_pause_gates_the_stop_policy_hooks() -> None:
coordinator = AgentCoordinator()
hooks = ReportUsageHooks(model="m", max_budget_usd=None)
assert hooks.budget_policy == "stop"
await coordinator.pause_budget()
with pytest.raises(BudgetPausedError):
await hooks.on_llm_start(_ctx(coordinator), MagicMock(), None, [])
await coordinator.resume_budget()
await hooks.on_llm_start(_ctx(coordinator), MagicMock(), None, [])
@pytest.mark.asyncio
async def test_a_user_message_lifts_only_the_limit_pause(tmp_path: Path) -> None:
coordinator = AgentCoordinator()
await coordinator.register("root", "strix", parent_id=None)
session = open_agent_session("root", tmp_path / "agents.db")
await coordinator.attach_runtime("root", session=session)
extensions: list[int] = []
coordinator.set_budget_extender(lambda: extensions.append(1))
await coordinator.pause_budget()
await coordinator.park_for_budget("root")
assert coordinator.statuses["root"] == "budget_paused"
await coordinator.send("root", {"from": "user", "content": "keep going"})
assert _pause_flags(coordinator) == (True, True)
assert extensions == []
assert coordinator.pending_counts["root"] == 1
await coordinator.resume_budget()
await coordinator.pause_for_budget("root")
await coordinator.send("root", {"from": "user", "content": "keep going"})
assert _pause_flags(coordinator) == (False, False)
assert extensions == [1]
session.close()
@pytest.mark.asyncio
async def test_snapshot_and_reset_keep_an_operator_pause() -> None:
coordinator = AgentCoordinator()
await coordinator.register("root", "strix", parent_id=None)
await coordinator.pause_budget()
snap = await coordinator.snapshot()
restored = AgentCoordinator()
await restored.restore(snap)
assert _pause_flags(restored) == (True, True)
await restored.reset_budget_stops(budget_stopped=False, reserve_stopped=False)
assert _pause_flags(restored) == (True, True)
await restored.resume_budget()
await restored.pause_for_budget("root")
await restored.reset_budget_stops(budget_stopped=False, reserve_stopped=False)
assert _pause_flags(restored) == (False, False)
assert restored.statuses["root"] == "waiting"