diff --git a/gateway/platforms/bluebubbles.py b/gateway/platforms/bluebubbles.py
index 1a28bbda68..c0f5fc458e 100644
--- a/gateway/platforms/bluebubbles.py
+++ b/gateway/platforms/bluebubbles.py
@@ -26,6 +26,7 @@ from gateway.platforms.base import (
     cache_image_from_bytes, cache_audio_from_bytes, cache_document_from_bytes)
 from .media_cache import ext_for_mime
 from gateway.platforms.helpers import compile_mention_patterns, strip_markdown
+from utils import TRUTHY_STRINGS
 
 # Historical BlueBubbles mime→ext maps, preserved verbatim as overrides for
 # the shared dispatch in gateway.platforms.media_cache. Both maps are
@@ -68,7 +69,6 @@ _ADDRESS_RE = re.compile(r"^\+\d+")
 
 _GUID_CACHE_SIZE = 500  # LRU cap for resolved chat-GUID lookups
 _LOCAL_HOSTS = {"0.0.0.0", "127.0.0.1", "localhost", "::"}
-_TRUTHY = {"true", "1", "yes", "on"}
 
 
 def _redact(text: str) -> str:
@@ -135,7 +135,7 @@ class BlueBubblesAdapter(BasePlatformAdapter):
         _require_mention = extra.get("require_mention")
         if _require_mention is None:
             _require_mention = os.getenv("BLUEBUBBLES_REQUIRE_MENTION")
-        self.require_mention = str(_require_mention).strip().lower() in _TRUTHY
+        self.require_mention = str(_require_mention).strip().lower() in TRUTHY_STRINGS
         self._mention_patterns = self._compile_mention_patterns(
             extra["mention_patterns"] if "mention_patterns" in extra else os.getenv("BLUEBUBBLES_MENTION_PATTERNS")
         )
diff --git a/gateway/platforms/signal.py b/gateway/platforms/signal.py
index 3fbcded8a2..7267c1189d 100644
--- a/gateway/platforms/signal.py
+++ b/gateway/platforms/signal.py
@@ -39,6 +39,7 @@ from gateway.platforms.signal_rate_limit import (
     SignalRateLimitError, _extract_retry_after_seconds, _format_wait, _is_signal_rate_limit_error,
     _signal_send_timeout, get_scheduler)
 from gateway.platforms._shared import get_scoped_secret as _sig_secret
+from utils import TRUTHY_STRINGS
 
 logger = logging.getLogger(__name__)
 
@@ -56,7 +57,6 @@ _MEDIA_TYPE_BY_MIME_PREFIX = (
 _OUTCOME_REACTION = {ProcessingOutcome.SUCCESS: "✅", ProcessingOutcome.FAILURE: "❌"}
 _QUOTE_AUTHOR_KEYS = (
     "author", "authorNumber", "authorUuid", "authorAci", "authorServiceId", "authorServiceIdString")
-_TRUTHY = ("true", "1", "yes", "on")
 
 
 def _parse_comma_list(value: str) -> List[str]:
@@ -195,7 +195,7 @@ class SignalAdapter(BasePlatformAdapter):
         _rm_cfg = extra.get("require_mention")
         self.require_mention = (
             bool(_rm_cfg) if _rm_cfg is not None
-            else os.getenv("SIGNAL_REQUIRE_MENTION", "false").lower() in _TRUTHY)
+            else os.getenv("SIGNAL_REQUIRE_MENTION", "false").lower() in TRUTHY_STRINGS)
         # DM allowlist mirrors run.py's SIGNAL_ALLOWED_USERS so reaction hooks (which fire
         # before run.py's auth gate) can skip unauthorized senders. "*" = open.
         self.dm_allow_from = set(_parse_comma_list(_sig_secret("SIGNAL_ALLOWED_USERS", "*")))