diff --git a/gateway/platforms/homeassistant.py b/gateway/platforms/homeassistant.py
index 746465594..0abebe42a 100644
--- a/gateway/platforms/homeassistant.py
+++ b/gateway/platforms/homeassistant.py
@@ -39,10 +39,12 @@ from gateway.platforms.base import (
 logger = logging.getLogger(__name__)
 
 
-def check_ha_requirements() -> bool:
+def check_ha_requirements(config: Optional[PlatformConfig] = None) -> bool:
     """Check if Home Assistant dependencies are available and configured."""
     if not AIOHTTP_AVAILABLE:
         return False
+    if config is not None and config.token:
+        return True
     if not os.getenv("HASS_TOKEN"):
         return False
     return True
diff --git a/gateway/platforms/mattermost.py b/gateway/platforms/mattermost.py
index 0e6c9631d..086305115 100644
--- a/gateway/platforms/mattermost.py
+++ b/gateway/platforms/mattermost.py
@@ -50,10 +50,11 @@ _RECONNECT_MAX_DELAY = 60.0
 _RECONNECT_JITTER = 0.2
 
 
-def check_mattermost_requirements() -> bool:
+def check_mattermost_requirements(config: Optional[PlatformConfig] = None) -> bool:
     """Return True if the Mattermost adapter can be used."""
-    token = os.getenv("MATTERMOST_TOKEN", "")
-    url = os.getenv("MATTERMOST_URL", "")
+    extra = getattr(config, "extra", {}) or {}
+    token = getattr(config, "token", None) or os.getenv("MATTERMOST_TOKEN", "")
+    url = extra.get("url", "") or os.getenv("MATTERMOST_URL", "")
     if not token:
         logger.debug("Mattermost: MATTERMOST_TOKEN not set")
         return False
@@ -736,4 +737,3 @@ class MattermostAdapter(BasePlatformAdapter):
 
         await self.handle_message(msg_event)
 
-
diff --git a/gateway/platforms/signal.py b/gateway/platforms/signal.py
index 9a0a6256a..4c141f994 100644
--- a/gateway/platforms/signal.py
+++ b/gateway/platforms/signal.py
@@ -149,9 +149,12 @@ def _looks_like_e164_number(value: str) -> bool:
     return digits.isdigit() and 7 <= len(digits) <= 15
 
 
-def check_signal_requirements() -> bool:
+def check_signal_requirements(config: Optional[PlatformConfig] = None) -> bool:
     """Check if Signal is configured (has URL and account)."""
-    return bool(os.getenv("SIGNAL_HTTP_URL") and os.getenv("SIGNAL_ACCOUNT"))
+    extra = getattr(config, "extra", {}) or {}
+    http_url = extra.get("http_url") or os.getenv("SIGNAL_HTTP_URL")
+    account = extra.get("account") or os.getenv("SIGNAL_ACCOUNT")
+    return bool(http_url and account)
 
 
 # ---------------------------------------------------------------------------
diff --git a/gateway/run.py b/gateway/run.py
index 14bd3ff0d..d07c2a294 100644
--- a/gateway/run.py
+++ b/gateway/run.py
@@ -2851,14 +2851,14 @@ class GatewayRunner:
 
         elif platform == Platform.SIGNAL:
             from gateway.platforms.signal import SignalAdapter, check_signal_requirements
-            if not check_signal_requirements():
+            if not check_signal_requirements(config):
                 logger.warning("Signal: SIGNAL_HTTP_URL or SIGNAL_ACCOUNT not configured")
                 return None
             return SignalAdapter(config)
 
         elif platform == Platform.HOMEASSISTANT:
             from gateway.platforms.homeassistant import HomeAssistantAdapter, check_ha_requirements
-            if not check_ha_requirements():
+            if not check_ha_requirements(config):
                 logger.warning("HomeAssistant: aiohttp not installed or HASS_TOKEN not set")
                 return None
             return HomeAssistantAdapter(config)
@@ -2917,7 +2917,7 @@ class GatewayRunner:
 
         elif platform == Platform.MATTERMOST:
             from gateway.platforms.mattermost import MattermostAdapter, check_mattermost_requirements
-            if not check_mattermost_requirements():
+            if not check_mattermost_requirements(config):
                 logger.warning("Mattermost: MATTERMOST_TOKEN or MATTERMOST_URL not set, or aiohttp missing")
                 return None
             return MattermostAdapter(config)
diff --git a/tests/gateway/test_runner_config_backed_adapters.py b/tests/gateway/test_runner_config_backed_adapters.py
new file mode 100644
index 000000000..5a15e717b
--- /dev/null
+++ b/tests/gateway/test_runner_config_backed_adapters.py
@@ -0,0 +1,86 @@
+from gateway.config import GatewayConfig, Platform, PlatformConfig
+from gateway.platforms.homeassistant import HomeAssistantAdapter, check_ha_requirements
+from gateway.platforms.mattermost import MattermostAdapter, check_mattermost_requirements
+from gateway.platforms.signal import SignalAdapter, check_signal_requirements
+from gateway.run import GatewayRunner
+
+
+def _clear_gateway_env(monkeypatch) -> None:
+    for key in (
+        "HASS_TOKEN",
+        "HASS_URL",
+        "MATTERMOST_TOKEN",
+        "MATTERMOST_URL",
+        "SIGNAL_HTTP_URL",
+        "SIGNAL_ACCOUNT",
+    ):
+        monkeypatch.delenv(key, raising=False)
+
+
+def test_homeassistant_requirements_accept_platform_config(monkeypatch):
+    _clear_gateway_env(monkeypatch)
+
+    config = PlatformConfig(enabled=True, token="tok", extra={"url": "http://ha.local"})
+
+    assert check_ha_requirements(config) is True
+
+
+def test_mattermost_requirements_accept_platform_config(monkeypatch):
+    _clear_gateway_env(monkeypatch)
+
+    config = PlatformConfig(enabled=True, token="tok", extra={"url": "https://mm.example.com"})
+
+    assert check_mattermost_requirements(config) is True
+
+
+def test_signal_requirements_accept_platform_config(monkeypatch):
+    _clear_gateway_env(monkeypatch)
+
+    config = PlatformConfig(
+        enabled=True,
+        extra={"http_url": "http://127.0.0.1:8080", "account": "+15551234567"},
+    )
+
+    assert check_signal_requirements(config) is True
+
+
+def test_runner_creates_config_backed_homeassistant_adapter_without_env(monkeypatch):
+    _clear_gateway_env(monkeypatch)
+
+    runner = GatewayRunner(GatewayConfig())
+    config = PlatformConfig(enabled=True, token="tok", extra={"url": "http://ha.local"})
+
+    adapter = runner._create_adapter(Platform.HOMEASSISTANT, config)
+
+    assert isinstance(adapter, HomeAssistantAdapter)
+    assert adapter._hass_token == "tok"
+    assert adapter._hass_url == "http://ha.local"
+
+
+def test_runner_creates_config_backed_mattermost_adapter_without_env(monkeypatch):
+    _clear_gateway_env(monkeypatch)
+
+    runner = GatewayRunner(GatewayConfig())
+    config = PlatformConfig(enabled=True, token="tok", extra={"url": "https://mm.example.com"})
+
+    adapter = runner._create_adapter(Platform.MATTERMOST, config)
+
+    assert isinstance(adapter, MattermostAdapter)
+    assert adapter._token == "tok"
+    assert adapter._base_url == "https://mm.example.com"
+
+
+def test_runner_creates_config_backed_signal_adapter_without_env(monkeypatch):
+    _clear_gateway_env(monkeypatch)
+
+    runner = GatewayRunner(GatewayConfig())
+    config = PlatformConfig(
+        enabled=True,
+        extra={"http_url": "http://127.0.0.1:8080", "account": "+15551234567"},
+    )
+
+    adapter = runner._create_adapter(Platform.SIGNAL, config)
+
+    assert isinstance(adapter, SignalAdapter)
+    assert adapter.http_url == "http://127.0.0.1:8080"
+    assert adapter.account == "+15551234567"