diff --git a/CHANGELOG.md b/CHANGELOG.md
index 7fc4dc1e..eeb817fe 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,5 +1,34 @@
 # Hermes Web UI -- Changelog
 
+## [v0.51.10] — 2026-05-06 — 2-PR full-sweep batch
+
+### Fixed
+
+- **PR #1741** by @Michaelyklam — Isolate in-process cron scheduler profiles (closes #1575). The existing manual `/api/crons/run` flow already enters `cron_profile_context_for_home(...)` before calling `cron.scheduler.run_job()`, but a future in-process scheduler tick path (no request TLS) would call `run_job()` directly with whatever process-global profile happened to be active. New `install_cron_scheduler_profile_isolation()` in `api/profiles.py` (called once at WebUI profile-state init) wraps `cron.scheduler.run_job()` so it resolves the job's persisted `profile` to the matching `HERMES_HOME` and enters the same `cron_profile_context_for_home(...)` before execution. Thread-local cron-context depth tracking prevents re-entry when the manual path already pinned the profile (otherwise the non-reentrant `_cron_env_lock` would deadlock). Idempotent install via `_webui_profile_isolated` sentinel. Defensive: closes a future architectural gap; no behavior change to existing manual cron path. 4 new regression tests for the wrapper and the manual-run no-reentry guard.
+- **PR #1742** by @Michaelyklam — Allow profile switching during active streams (closes #1700). The previous `switch_profile()` blocked ALL profile switches whenever any stream was active, but the WebUI route uses cookie/thread-local switching (`process_wide=False`) which doesn't actually mutate `HERMES_HOME`, module-level path caches, process `.env`, or global config. Split the guard: process-wide global mutations remain blocked during active streams (still correct), per-client cookie switches now proceed unblocked. Frontend `static/panels.js` removes the `S.busy`-based early return and treats `active_stream_id`/`pending_user_message` as in-progress, so switching away creates a fresh session for the target profile rather than retagging the running one (matches the convention used in `static/boot.js`, `static/messages.js`, `static/commands.js`). 4 new regression tests + browser QA screenshot.
+
+### In-stage absorbed fix
+
+**Opus follow-up (absorbed in-release):**
+
+- **i18n cleanup — remove orphaned `profiles_busy_switch` keys.** PR #1742 removed the only consumer of this toast (the frontend `S.busy`-based early return). 9 locale entries were left orphaned. Opus stage-304 advisor flagged this as a low-priority SHOULD-FIX; absorbed per the absorb-default policy. Locale parity tests still pass (key removed from English first).
+
+### Tests
+
+4590 → **4596 passing** (+6 regression tests across the 2 PRs). 0 regressions. Full suite ~129s.
+
+### Pre-release verification
+
+- Stage-304: 2 PRs merged with sibling-rebase against stage HEAD on `api/profiles.py` (different regions: #1741 lines 248-345, #1742 around line 596 + #1741's offset). No conflicts.
+- All JS files syntax-clean (`node -c static/{panels,i18n}.js`).
+- All Python files syntax-clean.
+- pytest: 4596 passed, 0 failed (single clean run).
+- `scripts/run-browser-tests.sh`: all 11 endpoints PASS on isolated port 8789 with stage-304 binary.
+- Pre-stamp re-fetch: both PR heads still match local rebases — no late contributor commits.
+- Opus advisor: SHIP both, 5/5 verification questions clean, 0 MUST-FIX, 1 SHOULD-FIX absorbed (orphaned i18n keys).
+
+Closes #1575, #1700.
+
 ## [v0.51.9] — 2026-05-06 — 2-PR full-sweep batch
 
 ### Fixed
diff --git a/ROADMAP.md b/ROADMAP.md
index 969c1cc1..c5982e0e 100644
--- a/ROADMAP.md
+++ b/ROADMAP.md
@@ -2,7 +2,7 @@
 
 > Web companion to the Hermes Agent CLI. Same workflows, browser-native.
 >
-> Last updated: v0.51.9 (May 6, 2026) — 4590 tests collected — 2-PR full-sweep batch (#1735, #1738)
+> Last updated: v0.51.10 (May 6, 2026) — 4596 tests collected — 2-PR full-sweep batch (#1741, #1742)
 > Test source: `pytest tests/ --collect-only -q`
 > Per-version detail: see [CHANGELOG.md](./CHANGELOG.md)
 
diff --git a/TESTING.md b/TESTING.md
index 0546e658..bf5f624b 100644
--- a/TESTING.md
+++ b/TESTING.md
@@ -1835,8 +1835,8 @@ Bridged CLI sessions:
 
 ---
 
-*Last updated: v0.51.9, May 6, 2026*
-*Total automated tests collected: 4590*
+*Last updated: v0.51.10, May 6, 2026*
+*Total automated tests collected: 4596*
 *Regression gate: tests/test_regressions.py*
 *Run: pytest tests/ -v --timeout=60*
 *Source: <repo>/*
diff --git a/api/profiles.py b/api/profiles.py
index 52c552b2..f9744c27 100644
--- a/api/profiles.py
+++ b/api/profiles.py
@@ -248,6 +248,82 @@ def get_active_hermes_home() -> Path:
 _cron_env_lock = threading.Lock()
 
 
+def _cron_profile_context_depth() -> int:
+    return int(getattr(_tls, 'cron_profile_depth', 0) or 0)
+
+
+def _push_cron_profile_context_depth() -> None:
+    _tls.cron_profile_depth = _cron_profile_context_depth() + 1
+
+
+def _pop_cron_profile_context_depth() -> None:
+    depth = _cron_profile_context_depth()
+    _tls.cron_profile_depth = max(0, depth - 1)
+
+
+def _home_for_scheduled_cron_job(job: dict) -> Path:
+    """Resolve the profile home an auto-fired scheduler job should execute in.
+
+    Legacy jobs with no profile keep the scheduler's server-default profile.
+    Jobs pinned to a named profile execute under that profile's HERMES_HOME, so
+    an in-process WebUI scheduler thread does not leak process-global config or
+    .env into the agent run. If a profile was deleted after the job was saved,
+    fall back to the server default rather than crashing every scheduler tick.
+    """
+    raw = str((job or {}).get('profile') or '').strip()
+    if not raw:
+        return get_active_hermes_home()
+    if _is_root_profile(raw):
+        return _DEFAULT_HERMES_HOME
+    if not _PROFILE_ID_RE.fullmatch(raw):
+        logger.warning(
+            "Cron job %s has invalid profile %r; falling back to server default",
+            (job or {}).get('id', '?'), raw,
+        )
+        return get_active_hermes_home()
+    home = _resolve_named_profile_home(raw)
+    if not home.is_dir():
+        logger.warning(
+            "Cron job %s references missing profile %r; falling back to server default",
+            (job or {}).get('id', '?'), raw,
+        )
+        return get_active_hermes_home()
+    return home
+
+
+def install_cron_scheduler_profile_isolation() -> None:
+    """Patch cron.scheduler.run_job for WebUI in-process scheduler safety.
+
+    Standard WebUI deployments do not start the scheduler thread in-process, but
+    if a future/single-process deployment calls cron.scheduler.tick() from the
+    WebUI worker, tick's background job path has no request TLS context. Wrap
+    run_job so each auto-fired job's persisted ``profile`` field gets the same
+    HERMES_HOME isolation as the manual /api/crons/run path.
+    """
+    try:
+        import cron.scheduler as _cs
+    except ImportError:
+        logger.debug("install_cron_scheduler_profile_isolation: cron.scheduler unavailable")
+        return
+
+    original = getattr(_cs, 'run_job', None)
+    if original is None or getattr(original, '_webui_profile_isolated', False):
+        return
+
+    def _webui_profile_isolated_run_job(job, *args, **kwargs):
+        # Manual WebUI runs already enter cron_profile_context_for_home before
+        # calling run_job. Avoid nesting the non-reentrant env lock or changing
+        # the explicitly selected manual execution profile.
+        if _cron_profile_context_depth() > 0:
+            return original(job, *args, **kwargs)
+        with cron_profile_context_for_home(_home_for_scheduled_cron_job(job)):
+            return original(job, *args, **kwargs)
+
+    _webui_profile_isolated_run_job._webui_profile_isolated = True
+    _webui_profile_isolated_run_job._webui_original_run_job = original
+    _cs.run_job = _webui_profile_isolated_run_job
+
+
 class cron_profile_context_for_home:
     """Context manager that pins HERMES_HOME to an explicit profile home path.
 
@@ -261,6 +337,7 @@ class cron_profile_context_for_home:
 
     def __enter__(self):
         _cron_env_lock.acquire()
+        _push_cron_profile_context_depth()
         try:
             self._prev_env = os.environ.get('HERMES_HOME')
             os.environ['HERMES_HOME'] = str(self._home)
@@ -296,6 +373,7 @@ class cron_profile_context_for_home:
             except (ImportError, AttributeError):
                 logger.debug("cron_profile_context_for_home: cron.scheduler unavailable")
         except Exception:
+            _pop_cron_profile_context_depth()
             _cron_env_lock.release()
             raise
         return self
@@ -319,6 +397,7 @@ class cron_profile_context_for_home:
                 except (ImportError, AttributeError):
                     pass
         finally:
+            _pop_cron_profile_context_depth()
             _cron_env_lock.release()
         return False
 
@@ -337,6 +416,7 @@ class cron_profile_context:
 
     def __enter__(self):
         _cron_env_lock.acquire()
+        _push_cron_profile_context_depth()
         try:
             self._prev_env = os.environ.get('HERMES_HOME')
             home = get_active_hermes_home()
@@ -371,6 +451,7 @@ class cron_profile_context:
             except (ImportError, AttributeError):
                 logger.debug("cron_profile_context: cron.scheduler unavailable; env-var only")
         except Exception:
+            _pop_cron_profile_context_depth()
             _cron_env_lock.release()
             raise
         return self
@@ -397,6 +478,7 @@ class cron_profile_context:
                 except (ImportError, AttributeError):
                     pass
         finally:
+            _pop_cron_profile_context_depth()
             _cron_env_lock.release()
         return False
 
@@ -573,6 +655,7 @@ def init_profile_state() -> None:
     _active_profile = _read_active_profile_file()
     home = get_active_hermes_home()
     _set_hermes_home(home)
+    install_cron_scheduler_profile_isolation()
     _reload_dotenv(home)
 
 
@@ -596,13 +679,18 @@ def switch_profile(name: str, *, process_wide: bool = True) -> dict:
     # Import here to avoid circular import at module load
     from api.config import STREAMS, STREAMS_LOCK, reload_config
 
-    # Block if agent is running
-    with STREAMS_LOCK:
-        if len(STREAMS) > 0:
-            raise RuntimeError(
-                'Cannot switch profiles while an agent is running. '
-                'Cancel or wait for it to finish.'
-            )
+    # Process-wide profile switches mutate HERMES_HOME, module-level path caches,
+    # os.environ-backed .env keys, and the global config cache. Keep those blocked
+    # while any agent stream is active. Per-client WebUI switches are cookie/TLS
+    # scoped (process_wide=False) and do not mutate those globals, so users can
+    # leave a running session in one profile and start work in another (#1700).
+    if process_wide:
+        with STREAMS_LOCK:
+            if len(STREAMS) > 0:
+                raise RuntimeError(
+                    'Cannot switch profiles while an agent is running. '
+                    'Cancel or wait for it to finish.'
+                )
 
     # Resolve profile directory
     if _is_root_profile(name):
diff --git a/docs/pr-media/1700/profile-switch-away-from-running-session.png b/docs/pr-media/1700/profile-switch-away-from-running-session.png
new file mode 100644
index 00000000..a6c1f178
Binary files /dev/null and b/docs/pr-media/1700/profile-switch-away-from-running-session.png differ
diff --git a/static/i18n.js b/static/i18n.js
index 6a9bf433..68ca08bf 100644
--- a/static/i18n.js
+++ b/static/i18n.js
@@ -905,7 +905,6 @@ const LOCALES = {
     profile_api_key_placeholder: 'API key (optional)',
     manage_profiles: 'Manage profiles',
     profiles_load_failed: 'Failed to load profiles',
-    profiles_busy_switch: 'Cannot switch profiles while agent is running',
     profile_switched_new_conversation: (name) => `Switched to profile: ${name} — new conversation started`,
     profile_switched: (name) => `Switched to profile: ${name}`,
     profile_name_rule: 'Lowercase letters, numbers, hyphens, underscores only',
@@ -1914,7 +1913,6 @@ const LOCALES = {
     profile_api_key_placeholder: 'APIキー (任意)',
     manage_profiles: 'プロファイルを管理',
     profiles_load_failed: 'プロファイルの読み込みに失敗しました',
-    profiles_busy_switch: 'エージェント実行中はプロファイルを切り替えできません',
     profile_switched_new_conversation: (name) => `プロファイルを切替: ${name} — 新しい会話を開始しました`,
     profile_switched: (name) => `プロファイルを切替: ${name}`,
     profile_name_rule: '小文字、数字、ハイフン、アンダースコアのみ',
@@ -2713,7 +2711,6 @@ const LOCALES = {
     profile_api_key_placeholder: 'API-ключ (необязательно)',
     manage_profiles: 'Управление профилями',
     profiles_load_failed: 'Не удалось загрузить профили',
-    profiles_busy_switch: 'Нельзя переключать профили, пока агент работает',
     profile_switched_new_conversation: (name) => `Переключено на профиль: ${name} — начата новая беседа`,
     profile_switched: (name) => `Переключено на профиль: ${name}`,
     profile_name_rule: 'Только строчные буквы, цифры, дефисы и подчёркивания',
@@ -3665,7 +3662,6 @@ const LOCALES = {
     profile_api_key_placeholder: 'Clave API (opcional)',
     manage_profiles: 'Manage profiles',
     profiles_load_failed: 'Failed to load profiles',
-    profiles_busy_switch: 'Cannot switch profiles while agent is running',
     profile_switched_new_conversation: (name) => `Switched to profile: ${name} — new conversation started`,
     profile_switched: (name) => `Switched to profile: ${name}`,
     profile_name_rule: 'Lowercase letters, numbers, hyphens, underscores only',
@@ -4742,7 +4738,6 @@ const LOCALES = {
     profile_api_key_placeholder: 'sk-…',
     manage_profiles: 'Profile verwalten',
     profiles_load_failed: 'Profile konnten nicht geladen werden.',
-    profiles_busy_switch: 'Profil kann nicht gewechselt werden.',
     profile_switched_new_conversation: 'Profil gewechselt. Neue Konversation.',
     profile_switched: 'Profil gewechselt.',
     profile_name_rule: 'Nur alphanumerische Zeichen.',
@@ -5534,7 +5529,6 @@ const LOCALES = {
     profile_api_key_placeholder: 'API 密钥（可选）',
     manage_profiles: '管理配置档',
     profiles_load_failed: '加载配置档失败',
-    profiles_busy_switch: 'Agent 运行中，无法切换配置档',
     profile_switched_new_conversation: (name) => `已切换到配置档：${name}，并新建对话`,
     profile_switched: (name) => `已切换到配置档：${name}`,
     profile_name_rule: '仅允许小写字母、数字、连字符和下划线',
@@ -6415,7 +6409,6 @@ const LOCALES = {
     profile_switched: (name) => `已切換到 ${name}`,
     profile_switched_new_conversation: (name) => `已切換到 ${name}（新會話）`,
     profile_use: '\u4f7f\u7528',
-    profiles_busy_switch: 'Agent \u57f7\u884c\u4e2d\u7121\u6cd5\u5207\u63db\u8a2d\u5b9a\u6a94',
     profiles_load_failed: '\u8f09\u5165\u8a2d\u5b9a\u6a94\u5931\u6557',
     profiles_no_profiles: '\u627e\u4e0d\u5230\u8a2d\u5b9a\u6a94\u3002',
     remove: '\u79fb\u9664',
@@ -7516,7 +7509,6 @@ const LOCALES = {
     profile_api_key_placeholder: 'Opcional',
     manage_profiles: 'Gerenciar perfis',
     profiles_load_failed: 'Falha ao carregar perfis',
-    profiles_busy_switch: 'Não pode trocar perfis com agente rodando',
     profile_switched_new_conversation: (name) => `Trocado para perfil: ${name} — nova conversa iniciada`,
     profile_switched: (name) => `Trocado para perfil: ${name}`,
     profile_delete_confirm: (name) => `Excluir perfil "${name}"?`,
@@ -8427,7 +8419,6 @@ const LOCALES = {
     profile_api_key_placeholder: 'API key (optional)',
     manage_profiles: 'Manage profiles',
     profiles_load_failed: 'Failed to load profiles',
-    profiles_busy_switch: 'Cannot switch profiles while agent is running',
     profile_switched_new_conversation: (name) => `Switched to profile: ${name} — new conversation started`,
     profile_switched: (name) => `Switched to profile: ${name}`,
     profile_name_rule: 'Lowercase letters, numbers, hyphens, underscores only',
diff --git a/static/panels.js b/static/panels.js
index c07e6229..12531130 100644
--- a/static/panels.js
+++ b/static/panels.js
@@ -3766,7 +3766,9 @@ window.addEventListener('resize',()=>{
 });
 
 async function switchToProfile(name) {
-  if (S.busy) { showToast(t('profiles_busy_switch')); return; }
+  // Profile switches are per-client cookie/TLS scoped, so a running stream in
+  // the current session can safely continue while this tab moves to another
+  // profile. The in-flight session stays attached to its original profile.
 
   // ── Loading indicator ───────────────────────────────────────────────────
   // Show spinner on the profile chip immediately so the user gets visual
@@ -3781,7 +3783,11 @@ async function switchToProfile(name) {
   // Determine whether the current session has any messages.
   // A session with messages is "in progress" and belongs to the current profile —
   // we must not retag it.  We'll start a fresh session for the new profile instead.
-  const sessionInProgress = S.session && S.messages && S.messages.length > 0;
+  const sessionInProgress = S.session && (
+    (S.messages && S.messages.length > 0) ||
+    S.session.active_stream_id ||
+    S.session.pending_user_message
+  );
 
   try {
     const data = await api('/api/profile/switch', { method: 'POST', body: JSON.stringify({ name }) });
diff --git a/tests/test_issue1700_parallel_profile_switch.py b/tests/test_issue1700_parallel_profile_switch.py
new file mode 100644
index 00000000..7928b9a7
--- /dev/null
+++ b/tests/test_issue1700_parallel_profile_switch.py
@@ -0,0 +1,95 @@
+"""Regression coverage for issue #1700 parallel profile switching.
+
+A WebUI profile switch uses cookie/thread-local profile state, so it should be
+allowed while another session is streaming. Only process-wide profile switches
+must remain blocked because they mutate global Hermes runtime state.
+"""
+from pathlib import Path
+
+import pytest
+
+REPO_ROOT = Path(__file__).parent.parent.resolve()
+PANELS_JS = (REPO_ROOT / "static" / "panels.js").read_text(encoding="utf-8")
+
+
+def _extract_switch_to_profile() -> str:
+    marker = "async function switchToProfile(name) {"
+    idx = PANELS_JS.find(marker)
+    assert idx != -1, "switchToProfile() not found in static/panels.js"
+    depth = 0
+    for i, ch in enumerate(PANELS_JS[idx:], idx):
+        if ch == "{":
+            depth += 1
+        elif ch == "}":
+            depth -= 1
+            if depth == 0:
+                return PANELS_JS[idx : i + 1]
+    raise AssertionError("Could not extract switchToProfile() body")
+
+
+def _prepare_profile_tree(tmp_path, monkeypatch):
+    import api.profiles as profiles
+
+    default_home = tmp_path / ".hermes"
+    target_home = default_home / "profiles" / "writer"
+    target_workspace = tmp_path / "writer-workspace"
+    target_workspace.mkdir(parents=True)
+    target_home.mkdir(parents=True)
+    (target_home / "config.yaml").write_text(
+        f"model:\n  provider: openai-codex\n  default: gpt-5.5\n"
+        f"terminal:\n  cwd: {target_workspace}\n",
+        encoding="utf-8",
+    )
+
+    monkeypatch.setattr(profiles, "_DEFAULT_HERMES_HOME", default_home)
+    monkeypatch.setattr(profiles, "_active_profile", "default")
+    monkeypatch.setattr(profiles, "list_profiles_api", lambda: [{"name": "default"}, {"name": "writer"}])
+    profiles._tls.profile = None
+    return profiles
+
+
+def test_process_wide_switch_still_blocks_when_stream_is_active(tmp_path, monkeypatch):
+    profiles = _prepare_profile_tree(tmp_path, monkeypatch)
+    from api.config import STREAMS
+
+    STREAMS.clear()
+    STREAMS["stream-default"] = object()
+    try:
+        with pytest.raises(RuntimeError, match="Cannot switch profiles while an agent is running"):
+            profiles.switch_profile("writer", process_wide=True)
+    finally:
+        STREAMS.clear()
+        profiles._tls.profile = None
+
+
+def test_per_client_switch_allowed_when_stream_is_active(tmp_path, monkeypatch):
+    profiles = _prepare_profile_tree(tmp_path, monkeypatch)
+    from api.config import STREAMS
+
+    STREAMS.clear()
+    STREAMS["stream-default"] = object()
+    try:
+        result = profiles.switch_profile("writer", process_wide=False)
+    finally:
+        STREAMS.clear()
+        profiles._tls.profile = None
+
+    assert result["active"] == "writer"
+    assert result["default_model"] == "gpt-5.5"
+
+
+def test_frontend_profile_switch_no_longer_blocks_on_busy_state():
+    fn = _extract_switch_to_profile()
+
+    assert "profiles_busy_switch" not in fn
+    assert "if (S.busy)" not in fn
+    assert "Profile switches are per-client cookie/TLS scoped" in fn
+
+
+def test_frontend_treats_active_or_pending_session_as_in_progress():
+    fn = _extract_switch_to_profile()
+    session_block = fn[fn.find("const sessionInProgress") : fn.find("try {", fn.find("const sessionInProgress"))]
+
+    assert "S.session.active_stream_id" in session_block
+    assert "S.session.pending_user_message" in session_block
+    assert "S.messages.length > 0" in session_block
diff --git a/tests/test_scheduled_jobs_profile_isolation.py b/tests/test_scheduled_jobs_profile_isolation.py
index 0d05cc4d..04f69224 100644
--- a/tests/test_scheduled_jobs_profile_isolation.py
+++ b/tests/test_scheduled_jobs_profile_isolation.py
@@ -199,6 +199,94 @@ def test_cron_run_does_not_silently_swallow_profile_resolution_errors():
     )
 
 
+def test_webui_installs_profile_context_on_in_process_scheduler_run_job(tmp_path, monkeypatch):
+    """If WebUI ever runs cron.scheduler.tick in-process, scheduled run_job calls
+    must execute under the job's selected profile home, not the process-global
+    HERMES_HOME that happened to be active when the scheduler thread fired.
+    """
+    import types
+
+    from api import profiles as p
+
+    default_home = tmp_path / "home"
+    research_home = default_home / "profiles" / "research"
+    research_home.mkdir(parents=True)
+    events = []
+
+    class Ctx:
+        def __init__(self, home):
+            self.home = str(home)
+
+        def __enter__(self):
+            events.append(("enter", self.home))
+            return self
+
+        def __exit__(self, exc_type, exc, tb):
+            events.append(("exit", self.home))
+            return False
+
+    cron_pkg = types.ModuleType("cron")
+    cron_pkg.__path__ = []
+    cron_scheduler = types.ModuleType("cron.scheduler")
+    cron_scheduler.run_job = lambda job: events.append(("run", job["id"])) or "ok"
+
+    monkeypatch.setitem(sys.modules, "cron", cron_pkg)
+    monkeypatch.setitem(sys.modules, "cron.scheduler", cron_scheduler)
+    monkeypatch.setattr(p, "_DEFAULT_HERMES_HOME", default_home)
+    monkeypatch.setattr(p, "cron_profile_context_for_home", Ctx)
+
+    p.install_cron_scheduler_profile_isolation()
+
+    assert cron_scheduler.run_job({"id": "job1575", "profile": "research"}) == "ok"
+    assert events == [
+        ("enter", str(research_home)),
+        ("run", "job1575"),
+        ("exit", str(research_home)),
+    ]
+
+
+def test_scheduler_run_job_wrapper_does_not_reenter_manual_cron_context(tmp_path, monkeypatch):
+    """Manual /api/crons/run already pins run_job before calling it.
+
+    The scheduler safety wrapper must detect that existing context and delegate
+    directly, otherwise the non-reentrant env lock would deadlock or override the
+    manual execution profile.
+    """
+    import types
+
+    from api import profiles as p
+
+    events = []
+
+    class Ctx:
+        def __init__(self, home):
+            self.home = str(home)
+
+        def __enter__(self):
+            events.append(("unexpected-enter", self.home))
+            return self
+
+        def __exit__(self, exc_type, exc, tb):
+            events.append(("unexpected-exit", self.home))
+            return False
+
+    cron_pkg = types.ModuleType("cron")
+    cron_pkg.__path__ = []
+    cron_scheduler = types.ModuleType("cron.scheduler")
+    cron_scheduler.run_job = lambda job: events.append(("run", job["id"])) or "ok"
+
+    monkeypatch.setitem(sys.modules, "cron", cron_pkg)
+    monkeypatch.setitem(sys.modules, "cron.scheduler", cron_scheduler)
+    monkeypatch.setattr(p, "_DEFAULT_HERMES_HOME", tmp_path / "home")
+    monkeypatch.setattr(p, "cron_profile_context_for_home", Ctx)
+    monkeypatch.setattr(p._tls, "cron_profile_depth", 1, raising=False)
+
+    p.install_cron_scheduler_profile_isolation()
+
+    assert cron_scheduler.run_job({"id": "manual1575", "profile": "research"}) == "ok"
+    assert events == [("run", "manual1575")]
+
+
 def test_cron_worker_does_not_silently_fall_back_on_profile_context_failure():
     """_run_cron_tracked must NOT silently set ctx=None when
     cron_profile_context_for_home(...).__enter__() raises.