mirror of
https://github.com/NousResearch/hermes-agent.git
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d97c324473
`terminal(background=true)` without `notify_on_complete=true` or `watch_patterns` runs the process SILENTLY — the agent has no way to learn it finished short of calling `process(action='poll')` explicitly. That's correct for genuine long-lived processes (servers, watchers, daemons) but is a footgun for every bounded task (tests, builds, deploys, CI pollers, batch jobs), which is the vast majority of background uses. Hit on May 23, 2026 (PR #31231 incident): agent launched a CI-watch loop with `background=true` only. The poller ran fine, exited green 6 minutes later, agent never noticed. User had to surface 'we are green CI, you can merge.' Memory and skill docs said *what* to do (poll in background) but not *how* to receive the result. The `notify_on_complete=true` flag exists and works, but is easy to forget when bg seems sufficient on its own. Two changes here, mutually reinforcing: 1. Runtime nudge: tool result for `background=true` w/o notify or watch_patterns now includes a `hint` field explaining the silent- process failure mode and pointing at the corrective flag. Agent sees it on the same turn and self-corrects without needing the user to surface anything. Cost for legitimate server cases is one ignored read (~50 tokens); cost for forgot-notify cases is prevented blindness (potentially many turns, or a user nudge). False positives << false negatives. 2. Schema/description rewrite: top-level TERMINAL_TOOL_DESCRIPTION and the `background` field description now lead with 'Almost always pair with notify_on_complete=true' instead of presenting it as one of two equally-likely patterns. The two legitimate non-notify shapes (long-lived servers; watch_patterns mid-process signals) are still documented, but as the minority case. Tests cover all four shapes: bg-only emits hint, bg+notify doesn't, bg+watch_patterns doesn't, foreground doesn't. 4 new tests; full suite of background/process tests stays green (160/160 across the relevant 6 test files).
505 lines
19 KiB
Python
505 lines
19 KiB
Python
"""Tests for notify_on_complete background process feature.
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Covers:
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- ProcessSession.notify_on_complete field
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- ProcessRegistry.completion_queue population on _move_to_finished()
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- Checkpoint persistence of notify_on_complete
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- Terminal tool schema includes notify_on_complete
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- Terminal tool handler passes notify_on_complete through
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"""
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import json
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import os
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import queue
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import time
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import pytest
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from pathlib import Path
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from unittest.mock import MagicMock, patch
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from tools.process_registry import (
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ProcessRegistry,
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ProcessSession,
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)
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@pytest.fixture()
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def registry():
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"""Create a fresh ProcessRegistry."""
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return ProcessRegistry()
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def _make_session(
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sid="proc_test_notify",
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command="echo hello",
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task_id="t1",
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exited=False,
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exit_code=None,
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output="",
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notify_on_complete=False,
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) -> ProcessSession:
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s = ProcessSession(
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id=sid,
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command=command,
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task_id=task_id,
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started_at=time.time(),
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exited=exited,
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exit_code=exit_code,
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output_buffer=output,
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notify_on_complete=notify_on_complete,
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)
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return s
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# =========================================================================
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# ProcessSession field
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# =========================================================================
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class TestProcessSessionField:
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def test_default_false(self):
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s = ProcessSession(id="proc_1", command="echo hi")
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assert s.notify_on_complete is False
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def test_set_true(self):
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s = ProcessSession(id="proc_1", command="echo hi", notify_on_complete=True)
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assert s.notify_on_complete is True
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# =========================================================================
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# Completion queue
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# =========================================================================
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class TestCompletionQueue:
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def test_queue_exists(self, registry):
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assert hasattr(registry, "completion_queue")
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assert registry.completion_queue.empty()
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def test_move_to_finished_no_notify(self, registry):
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"""Processes without notify_on_complete don't enqueue."""
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s = _make_session(notify_on_complete=False, output="done")
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s.exited = True
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s.exit_code = 0
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registry._running[s.id] = s
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with patch.object(registry, "_write_checkpoint"):
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registry._move_to_finished(s)
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assert registry.completion_queue.empty()
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def test_move_to_finished_with_notify(self, registry):
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"""Processes with notify_on_complete push to queue."""
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s = _make_session(
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notify_on_complete=True,
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output="build succeeded",
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exit_code=0,
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)
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s.exited = True
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s.exit_code = 0
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registry._running[s.id] = s
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with patch.object(registry, "_write_checkpoint"):
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registry._move_to_finished(s)
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assert not registry.completion_queue.empty()
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completion = registry.completion_queue.get_nowait()
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assert completion["session_id"] == s.id
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assert completion["command"] == "echo hello"
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assert completion["exit_code"] == 0
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assert "build succeeded" in completion["output"]
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def test_move_to_finished_nonzero_exit(self, registry):
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"""Nonzero exit codes are captured correctly."""
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s = _make_session(
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notify_on_complete=True,
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output="FAILED",
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exit_code=1,
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)
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s.exited = True
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s.exit_code = 1
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registry._running[s.id] = s
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with patch.object(registry, "_write_checkpoint"):
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registry._move_to_finished(s)
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completion = registry.completion_queue.get_nowait()
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assert completion["exit_code"] == 1
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assert "FAILED" in completion["output"]
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def test_move_to_finished_idempotent_no_duplicate(self, registry):
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"""Calling _move_to_finished twice must NOT enqueue two notifications.
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Regression test: kill_process() and the reader thread can both call
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_move_to_finished() for the same session, producing duplicate
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[SYSTEM: Background process ...] messages.
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"""
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s = _make_session(notify_on_complete=True, output="done", exit_code=-15)
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s.exited = True
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s.exit_code = -15
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registry._running[s.id] = s
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with patch.object(registry, "_write_checkpoint"):
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registry._move_to_finished(s) # first call — should enqueue
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s.exit_code = 143 # reader thread updates exit code
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registry._move_to_finished(s) # second call — should be no-op
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assert registry.completion_queue.qsize() == 1
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completion = registry.completion_queue.get_nowait()
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assert completion["exit_code"] == -15 # from the first (kill) call
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def test_output_truncated_to_2000(self, registry):
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"""Long output is truncated to last 2000 chars."""
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long_output = "x" * 5000
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s = _make_session(
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notify_on_complete=True,
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output=long_output,
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)
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s.exited = True
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s.exit_code = 0
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registry._running[s.id] = s
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with patch.object(registry, "_write_checkpoint"):
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registry._move_to_finished(s)
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completion = registry.completion_queue.get_nowait()
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assert len(completion["output"]) == 2000
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def test_multiple_completions_queued(self, registry):
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"""Multiple notify processes all push to the same queue."""
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for i in range(3):
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s = _make_session(
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sid=f"proc_{i}",
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notify_on_complete=True,
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output=f"output_{i}",
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)
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s.exited = True
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s.exit_code = 0
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registry._running[s.id] = s
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with patch.object(registry, "_write_checkpoint"):
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registry._move_to_finished(s)
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completions = []
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while not registry.completion_queue.empty():
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completions.append(registry.completion_queue.get_nowait())
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assert len(completions) == 3
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ids = {c["session_id"] for c in completions}
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assert ids == {"proc_0", "proc_1", "proc_2"}
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# =========================================================================
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# Checkpoint persistence
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# =========================================================================
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class TestCheckpointNotify:
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def test_checkpoint_includes_notify(self, registry, tmp_path):
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with patch("tools.process_registry.CHECKPOINT_PATH", tmp_path / "procs.json"):
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s = _make_session(notify_on_complete=True)
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registry._running[s.id] = s
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registry._write_checkpoint()
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data = json.loads((tmp_path / "procs.json").read_text())
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assert len(data) == 1
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assert data[0]["notify_on_complete"] is True
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def test_checkpoint_without_notify(self, registry, tmp_path):
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with patch("tools.process_registry.CHECKPOINT_PATH", tmp_path / "procs.json"):
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s = _make_session(notify_on_complete=False)
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registry._running[s.id] = s
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registry._write_checkpoint()
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data = json.loads((tmp_path / "procs.json").read_text())
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assert data[0]["notify_on_complete"] is False
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def test_recover_preserves_notify(self, registry, tmp_path):
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checkpoint = tmp_path / "procs.json"
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checkpoint.write_text(json.dumps([{
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"session_id": "proc_live",
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"command": "sleep 999",
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"pid": os.getpid(),
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"task_id": "t1",
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"notify_on_complete": True,
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}]))
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with patch("tools.process_registry.CHECKPOINT_PATH", checkpoint):
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recovered = registry.recover_from_checkpoint()
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assert recovered == 1
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s = registry.get("proc_live")
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assert s.notify_on_complete is True
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def test_recover_requeues_notify_watchers(self, registry, tmp_path):
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checkpoint = tmp_path / "procs.json"
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checkpoint.write_text(json.dumps([{
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"session_id": "proc_live",
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"command": "sleep 999",
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"pid": os.getpid(),
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"task_id": "t1",
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"session_key": "sk1",
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"watcher_platform": "telegram",
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"watcher_chat_id": "123",
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"watcher_user_id": "u123",
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"watcher_user_name": "alice",
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"watcher_thread_id": "42",
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"watcher_interval": 5,
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"notify_on_complete": True,
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}]))
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with patch("tools.process_registry.CHECKPOINT_PATH", checkpoint):
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recovered = registry.recover_from_checkpoint()
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assert recovered == 1
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assert len(registry.pending_watchers) == 1
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assert registry.pending_watchers[0]["notify_on_complete"] is True
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assert registry.pending_watchers[0]["user_id"] == "u123"
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assert registry.pending_watchers[0]["user_name"] == "alice"
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def test_recover_defaults_false(self, registry, tmp_path):
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"""Old checkpoint entries without the field default to False."""
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checkpoint = tmp_path / "procs.json"
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checkpoint.write_text(json.dumps([{
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"session_id": "proc_live",
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"command": "sleep 999",
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"pid": os.getpid(),
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"task_id": "t1",
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}]))
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with patch("tools.process_registry.CHECKPOINT_PATH", checkpoint):
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recovered = registry.recover_from_checkpoint()
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assert recovered == 1
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s = registry.get("proc_live")
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assert s.notify_on_complete is False
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# =========================================================================
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# Terminal tool schema
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# =========================================================================
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class TestTerminalSchema:
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def test_schema_has_notify_on_complete(self):
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from tools.terminal_tool import TERMINAL_SCHEMA
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props = TERMINAL_SCHEMA["parameters"]["properties"]
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assert "notify_on_complete" in props
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assert props["notify_on_complete"]["type"] == "boolean"
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assert props["notify_on_complete"]["default"] is False
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def test_handler_passes_notify(self):
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"""_handle_terminal passes notify_on_complete to terminal_tool."""
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from tools.terminal_tool import _handle_terminal
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with patch("tools.terminal_tool.terminal_tool", return_value='{"ok":true}') as mock_tt:
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_handle_terminal(
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{"command": "echo hi", "background": True, "notify_on_complete": True},
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task_id="t1",
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)
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_, kwargs = mock_tt.call_args
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assert kwargs["notify_on_complete"] is True
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# =========================================================================
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# Code execution blocked params
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# =========================================================================
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class TestCodeExecutionBlocked:
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def test_notify_on_complete_blocked_in_sandbox(self):
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from tools.code_execution_tool import _TERMINAL_BLOCKED_PARAMS
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assert "notify_on_complete" in _TERMINAL_BLOCKED_PARAMS
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# =========================================================================
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# Completion consumed suppression
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# =========================================================================
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class TestCompletionConsumed:
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"""Test that wait/poll/log suppress redundant completion notifications."""
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def test_wait_marks_completion_consumed(self, registry):
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"""wait() returning exited status marks session as consumed."""
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s = _make_session(sid="proc_wait", notify_on_complete=True, output="done")
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s.exited = True
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s.exit_code = 0
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registry._running[s.id] = s
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with patch.object(registry, "_write_checkpoint"):
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registry._move_to_finished(s)
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# Notification is in the queue
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assert not registry.completion_queue.empty()
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assert not registry.is_completion_consumed("proc_wait")
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# Agent calls wait() — gets the result directly
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result = registry.wait("proc_wait", timeout=1)
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assert result["status"] == "exited"
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# Now the completion is marked as consumed
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assert registry.is_completion_consumed("proc_wait")
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def test_poll_marks_completion_consumed(self, registry):
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"""poll() returning exited status marks session as consumed."""
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s = _make_session(sid="proc_poll", notify_on_complete=True, output="done")
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s.exited = True
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s.exit_code = 0
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registry._finished[s.id] = s
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result = registry.poll("proc_poll")
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assert result["status"] == "exited"
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assert registry.is_completion_consumed("proc_poll")
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def test_log_marks_completion_consumed(self, registry):
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"""read_log() on exited session marks as consumed."""
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s = _make_session(sid="proc_log", notify_on_complete=True, output="line1\nline2")
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s.exited = True
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s.exit_code = 0
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registry._finished[s.id] = s
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result = registry.read_log("proc_log")
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assert result["status"] == "exited"
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assert registry.is_completion_consumed("proc_log")
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def test_running_process_not_consumed(self, registry):
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"""poll() on a still-running process does not mark as consumed."""
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s = _make_session(sid="proc_running", notify_on_complete=True, output="partial")
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registry._running[s.id] = s
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result = registry.poll("proc_running")
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assert result["status"] == "running"
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assert not registry.is_completion_consumed("proc_running")
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# ---------------------------------------------------------------------------
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# Silent-background-process hint
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#
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# background=True without notify_on_complete=True OR watch_patterns runs
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# the process silently — the agent has no way to learn it finished short
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# of calling process(action="poll") explicitly. The tool result must
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# include a "hint" field that nudges the agent toward
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# notify_on_complete=True for bounded tasks. May 2026 PR #31231 incident:
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# bg CI poller exited green, agent never noticed, user had to surface it.
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# ---------------------------------------------------------------------------
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def _silent_bg_base_config(tmp_path):
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return {
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"env_type": "local",
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"docker_image": "",
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"singularity_image": "",
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"modal_image": "",
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"daytona_image": "",
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"cwd": str(tmp_path),
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"timeout": 30,
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}
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def _silent_bg_harness(monkeypatch, tmp_path):
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"""Common test fixture: patch enough of terminal_tool to spawn a fake
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background process and capture the JSON result the agent sees."""
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import tools.terminal_tool as terminal_tool_module
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from tools import process_registry as process_registry_module
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from types import SimpleNamespace
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config = _silent_bg_base_config(tmp_path)
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dummy_env = SimpleNamespace(env={})
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def fake_spawn_local(**kwargs):
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return SimpleNamespace(
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id="proc_silent_test",
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pid=4242,
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notify_on_complete=False,
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watcher_platform="",
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watcher_chat_id="",
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watcher_user_id="",
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watcher_user_name="",
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watcher_thread_id="",
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watcher_message_id="",
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watcher_interval=0,
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)
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monkeypatch.setattr(terminal_tool_module, "_get_env_config", lambda: config)
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monkeypatch.setattr(terminal_tool_module, "_start_cleanup_thread", lambda: None)
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monkeypatch.setattr(terminal_tool_module, "_check_all_guards", lambda *_args, **_kwargs: {"approved": True})
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monkeypatch.setattr(process_registry_module.process_registry, "spawn_local", fake_spawn_local)
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monkeypatch.setitem(terminal_tool_module._active_environments, "default", dummy_env)
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monkeypatch.setitem(terminal_tool_module._last_activity, "default", 0.0)
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return terminal_tool_module
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def test_background_without_notify_emits_silent_process_hint(monkeypatch, tmp_path):
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"""The footgun case (May 2026 PR #31231): bg=True alone runs silently
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and the agent has no signal it finished. Tool must nudge."""
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tt = _silent_bg_harness(monkeypatch, tmp_path)
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try:
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result = json.loads(
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tt.terminal_tool(
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command="while true; do gh pr checks 999; sleep 30; done",
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background=True,
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)
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)
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finally:
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tt._active_environments.pop("default", None)
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tt._last_activity.pop("default", None)
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assert result["session_id"] == "proc_silent_test"
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hint = result.get("hint", "")
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assert hint, "Silent background process must include a hint field"
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assert "notify_on_complete" in hint, (
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"Hint must name the corrective flag so the agent can self-correct"
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)
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assert "silent" in hint.lower() or "no way to learn" in hint.lower(), (
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"Hint must explain the failure mode, not just suggest the fix"
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)
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def test_background_with_notify_does_not_emit_hint(monkeypatch, tmp_path):
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"""The correct shape — bg+notify together — must not nag."""
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tt = _silent_bg_harness(monkeypatch, tmp_path)
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try:
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result = json.loads(
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tt.terminal_tool(
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command="pytest tests/",
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background=True,
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notify_on_complete=True,
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)
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)
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finally:
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tt._active_environments.pop("default", None)
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tt._last_activity.pop("default", None)
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assert "hint" not in result, (
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f"Correct usage must not emit a hint, got: {result.get('hint')!r}"
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)
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assert result.get("notify_on_complete") is True
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def test_background_with_watch_patterns_does_not_emit_hint(monkeypatch, tmp_path):
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"""watch_patterns is the other legitimate non-silent shape — also no hint."""
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tt = _silent_bg_harness(monkeypatch, tmp_path)
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try:
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result = json.loads(
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tt.terminal_tool(
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command="uvicorn app:server --port 8080",
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background=True,
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watch_patterns=["Application startup complete"],
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)
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)
|
|
finally:
|
|
tt._active_environments.pop("default", None)
|
|
tt._last_activity.pop("default", None)
|
|
|
|
assert "hint" not in result, (
|
|
f"watch_patterns shape must not emit a silent-process hint, got: {result.get('hint')!r}"
|
|
)
|
|
|
|
|
|
def test_foreground_command_does_not_emit_hint(monkeypatch, tmp_path):
|
|
"""Hint only applies to background processes — foreground returns its
|
|
result synchronously and the agent always sees the outcome."""
|
|
tt = _silent_bg_harness(monkeypatch, tmp_path)
|
|
|
|
# Foreground path doesn't go through spawn_local. Patch the local-env
|
|
# exec method to short-circuit to a clean exit so the test doesn't
|
|
# actually shell out.
|
|
from types import SimpleNamespace
|
|
dummy_env = SimpleNamespace(
|
|
env={},
|
|
execute=lambda *a, **kw: {"output": "done", "exit_code": 0, "error": None},
|
|
)
|
|
monkeypatch.setitem(tt._active_environments, "default", dummy_env)
|
|
|
|
try:
|
|
result = json.loads(
|
|
tt.terminal_tool(
|
|
command="echo hello",
|
|
background=False,
|
|
)
|
|
)
|
|
finally:
|
|
tt._active_environments.pop("default", None)
|
|
tt._last_activity.pop("default", None)
|
|
|
|
assert "hint" not in result, (
|
|
f"Foreground commands must not emit the background-silence hint, got: {result.get('hint')!r}"
|
|
)
|