diff --git a/nanobot/channels/base.py b/nanobot/channels/base.py
index 74c540a..e1b673f 100644
--- a/nanobot/channels/base.py
+++ b/nanobot/channels/base.py
@@ -24,6 +24,11 @@ class BaseChannel(ABC):
     display_name: str = "Base"
     transcription_api_key: str = ""
 
+    @classmethod
+    def default_config(cls) -> dict[str, Any] | None:
+        """Return the default config payload for onboarding, if the channel provides one."""
+        return None
+
     def __init__(self, config: Any, bus: MessageBus):
         """
         Initialize the channel.
diff --git a/nanobot/channels/dingtalk.py b/nanobot/channels/dingtalk.py
index 10b6b98..404f09d 100644
--- a/nanobot/channels/dingtalk.py
+++ b/nanobot/channels/dingtalk.py
@@ -162,6 +162,10 @@ class DingTalkChannel(BaseChannel):
     _AUDIO_EXTS = {".amr", ".mp3", ".wav", ".ogg", ".m4a", ".aac"}
     _VIDEO_EXTS = {".mp4", ".mov", ".avi", ".mkv", ".webm"}
 
+    @classmethod
+    def default_config(cls) -> dict[str, object]:
+        return DingTalkConfig().model_dump(by_alias=True)
+
     def __init__(self, config: DingTalkConfig | DingTalkInstanceConfig, bus: MessageBus):
         super().__init__(config, bus)
         self.config: DingTalkConfig | DingTalkInstanceConfig = config
@@ -262,9 +266,12 @@ class DingTalkChannel(BaseChannel):
 
     def _guess_upload_type(self, media_ref: str) -> str:
         ext = Path(urlparse(media_ref).path).suffix.lower()
-        if ext in self._IMAGE_EXTS: return "image"
-        if ext in self._AUDIO_EXTS: return "voice"
-        if ext in self._VIDEO_EXTS: return "video"
+        if ext in self._IMAGE_EXTS:
+            return "image"
+        if ext in self._AUDIO_EXTS:
+            return "voice"
+        if ext in self._VIDEO_EXTS:
+            return "video"
         return "file"
 
     def _guess_filename(self, media_ref: str, upload_type: str) -> str:
@@ -385,8 +392,10 @@ class DingTalkChannel(BaseChannel):
             if resp.status_code != 200:
                 logger.error("DingTalk send failed msgKey={} status={} body={}", msg_key, resp.status_code, body[:500])
                 return False
-            try: result = resp.json()
-            except Exception: result = {}
+            try:
+                result = resp.json()
+            except Exception:
+                result = {}
             errcode = result.get("errcode")
             if errcode not in (None, 0):
                 logger.error("DingTalk send api error msgKey={} errcode={} body={}", msg_key, errcode, body[:500])
diff --git a/nanobot/channels/discord.py b/nanobot/channels/discord.py
index a11101f..c72f7b0 100644
--- a/nanobot/channels/discord.py
+++ b/nanobot/channels/discord.py
@@ -27,6 +27,10 @@ class DiscordChannel(BaseChannel):
     name = "discord"
     display_name = "Discord"
 
+    @classmethod
+    def default_config(cls) -> dict[str, object]:
+        return DiscordConfig().model_dump(by_alias=True)
+
     def __init__(self, config: DiscordConfig | DiscordInstanceConfig, bus: MessageBus):
         super().__init__(config, bus)
         self.config: DiscordConfig | DiscordInstanceConfig = config
diff --git a/nanobot/channels/email.py b/nanobot/channels/email.py
index cc1e774..8070418 100644
--- a/nanobot/channels/email.py
+++ b/nanobot/channels/email.py
@@ -51,6 +51,10 @@ class EmailChannel(BaseChannel):
         "Dec",
     )
 
+    @classmethod
+    def default_config(cls) -> dict[str, object]:
+        return EmailConfig().model_dump(by_alias=True)
+
     def __init__(self, config: EmailConfig | EmailInstanceConfig, bus: MessageBus):
         super().__init__(config, bus)
         self.config: EmailConfig | EmailInstanceConfig = config
diff --git a/nanobot/channels/feishu.py b/nanobot/channels/feishu.py
index 52f5eda..2876b48 100644
--- a/nanobot/channels/feishu.py
+++ b/nanobot/channels/feishu.py
@@ -1,12 +1,13 @@
 """Feishu/Lark channel implementation using lark-oapi SDK with WebSocket long connection."""
 
 import asyncio
+import importlib.util
 import json
 import os
 import re
 import threading
+import time
 from collections import OrderedDict
-from pathlib import Path
 from typing import Any
 
 from loguru import logger
@@ -17,8 +18,6 @@ from nanobot.channels.base import BaseChannel
 from nanobot.config.paths import get_media_dir
 from nanobot.config.schema import FeishuConfig, FeishuInstanceConfig
 
-import importlib.util
-
 FEISHU_AVAILABLE = importlib.util.find_spec("lark_oapi") is not None
 
 # Message type display mapping
@@ -246,6 +245,10 @@ class FeishuChannel(BaseChannel):
     name = "feishu"
     display_name = "Feishu"
 
+    @classmethod
+    def default_config(cls) -> dict[str, object]:
+        return FeishuConfig().model_dump(by_alias=True)
+
     def __init__(self, config: FeishuConfig | FeishuInstanceConfig, bus: MessageBus):
         super().__init__(config, bus)
         self.config: FeishuConfig | FeishuInstanceConfig = config
@@ -314,8 +317,8 @@ class FeishuChannel(BaseChannel):
         # instead of the already-running main asyncio loop, which would cause
         # "This event loop is already running" errors.
         def run_ws():
-            import time
             import lark_oapi.ws.client as _lark_ws_client
+
             ws_loop = asyncio.new_event_loop()
             asyncio.set_event_loop(ws_loop)
             # Patch the module-level loop used by lark's ws Client.start()
@@ -375,7 +378,12 @@ class FeishuChannel(BaseChannel):
 
     def _add_reaction_sync(self, message_id: str, emoji_type: str) -> None:
         """Sync helper for adding reaction (runs in thread pool)."""
-        from lark_oapi.api.im.v1 import CreateMessageReactionRequest, CreateMessageReactionRequestBody, Emoji
+        from lark_oapi.api.im.v1 import (
+            CreateMessageReactionRequest,
+            CreateMessageReactionRequestBody,
+            Emoji,
+        )
+
         try:
             request = CreateMessageReactionRequest.builder() \
                 .message_id(message_id) \
diff --git a/nanobot/channels/mochat.py b/nanobot/channels/mochat.py
index 79220b2..c1d0055 100644
--- a/nanobot/channels/mochat.py
+++ b/nanobot/channels/mochat.py
@@ -219,6 +219,10 @@ class MochatChannel(BaseChannel):
     name = "mochat"
     display_name = "Mochat"
 
+    @classmethod
+    def default_config(cls) -> dict[str, object]:
+        return MochatConfig().model_dump(by_alias=True)
+
     def __init__(self, config: MochatConfig | MochatInstanceConfig, bus: MessageBus):
         super().__init__(config, bus)
         self.config: MochatConfig | MochatInstanceConfig = config
diff --git a/nanobot/channels/qq.py b/nanobot/channels/qq.py
index 4b20d80..3d7c8e4 100644
--- a/nanobot/channels/qq.py
+++ b/nanobot/channels/qq.py
@@ -56,6 +56,10 @@ class QQChannel(BaseChannel):
     name = "qq"
     display_name = "QQ"
 
+    @classmethod
+    def default_config(cls) -> dict[str, object]:
+        return QQConfig().model_dump(by_alias=True)
+
     def __init__(self, config: QQConfig | QQInstanceConfig, bus: MessageBus):
         super().__init__(config, bus)
         self.config: QQConfig | QQInstanceConfig = config
@@ -75,8 +79,8 @@ class QQChannel(BaseChannel):
             return
 
         self._running = True
-        BotClass = _make_bot_class(self)
-        self._client = BotClass()
+        bot_class = _make_bot_class(self)
+        self._client = bot_class()
         logger.info("QQ bot started (C2C & Group supported)")
         await self._run_bot()
 
diff --git a/nanobot/channels/slack.py b/nanobot/channels/slack.py
index a13620e..c1e8d6d 100644
--- a/nanobot/channels/slack.py
+++ b/nanobot/channels/slack.py
@@ -2,7 +2,6 @@
 
 import asyncio
 import re
-from typing import Any
 
 from loguru import logger
 from slack_sdk.socket_mode.request import SocketModeRequest
@@ -23,6 +22,10 @@ class SlackChannel(BaseChannel):
     name = "slack"
     display_name = "Slack"
 
+    @classmethod
+    def default_config(cls) -> dict[str, object]:
+        return SlackConfig().model_dump(by_alias=True)
+
     def __init__(self, config: SlackConfig | SlackInstanceConfig, bus: MessageBus):
         super().__init__(config, bus)
         self.config: SlackConfig | SlackInstanceConfig = config
diff --git a/nanobot/channels/telegram.py b/nanobot/channels/telegram.py
index b6f5433..594f23a 100644
--- a/nanobot/channels/telegram.py
+++ b/nanobot/channels/telegram.py
@@ -166,6 +166,10 @@ class TelegramChannel(BaseChannel):
 
     COMMAND_NAMES = ("start", "new", "lang", "persona", "skill", "stop", "help", "restart")
 
+    @classmethod
+    def default_config(cls) -> dict[str, object]:
+        return TelegramConfig().model_dump(by_alias=True)
+
     def __init__(self, config: TelegramConfig | TelegramInstanceConfig, bus: MessageBus):
         super().__init__(config, bus)
         self.config: TelegramConfig | TelegramInstanceConfig = config
diff --git a/nanobot/channels/wecom.py b/nanobot/channels/wecom.py
index 6c3e90b..73dcb9a 100644
--- a/nanobot/channels/wecom.py
+++ b/nanobot/channels/wecom.py
@@ -38,6 +38,10 @@ class WecomChannel(BaseChannel):
     name = "wecom"
     display_name = "WeCom"
 
+    @classmethod
+    def default_config(cls) -> dict[str, object]:
+        return WecomConfig().model_dump(by_alias=True)
+
     def __init__(self, config: WecomConfig | WecomInstanceConfig, bus: MessageBus):
         super().__init__(config, bus)
         self.config: WecomConfig | WecomInstanceConfig = config
diff --git a/nanobot/channels/whatsapp.py b/nanobot/channels/whatsapp.py
index 4360a9c..dc43b85 100644
--- a/nanobot/channels/whatsapp.py
+++ b/nanobot/channels/whatsapp.py
@@ -24,6 +24,10 @@ class WhatsAppChannel(BaseChannel):
     name = "whatsapp"
     display_name = "WhatsApp"
 
+    @classmethod
+    def default_config(cls) -> dict[str, object]:
+        return WhatsAppConfig().model_dump(by_alias=True)
+
     def __init__(self, config: WhatsAppConfig | WhatsAppInstanceConfig, bus: MessageBus):
         super().__init__(config, bus)
         self.config: WhatsAppConfig | WhatsAppInstanceConfig = config
diff --git a/nanobot/cli/commands.py b/nanobot/cli/commands.py
index 07b97a7..7ac8d0a 100644
--- a/nanobot/cli/commands.py
+++ b/nanobot/cli/commands.py
@@ -1,11 +1,11 @@
 """CLI commands for nanobot."""
 
 import asyncio
-from contextlib import contextmanager, nullcontext
 import os
 import select
 import signal
 import sys
+from contextlib import contextmanager, nullcontext
 from pathlib import Path
 from typing import Any
 
@@ -21,12 +21,11 @@ if sys.platform == "win32":
             pass
 
 import typer
-from prompt_toolkit import print_formatted_text
-from prompt_toolkit import PromptSession
+from prompt_toolkit import PromptSession, print_formatted_text
+from prompt_toolkit.application import run_in_terminal
 from prompt_toolkit.formatted_text import ANSI, HTML
 from prompt_toolkit.history import FileHistory
 from prompt_toolkit.patch_stdout import patch_stdout
-from prompt_toolkit.application import run_in_terminal
 from rich.console import Console
 from rich.markdown import Markdown
 from rich.table import Table
@@ -337,6 +336,30 @@ def _merge_missing_defaults(existing: Any, defaults: Any) -> Any:
     return merged
 
 
+def _resolve_channel_default_config(channel_cls: Any) -> dict[str, Any] | None:
+    """Return a channel's default config if it exposes a valid onboarding payload."""
+    from loguru import logger
+
+    default_config = getattr(channel_cls, "default_config", None)
+    if not callable(default_config):
+        return None
+    try:
+        payload = default_config()
+    except Exception as exc:
+        logger.warning("Skipping channel default_config for {}: {}", channel_cls, exc)
+        return None
+    if payload is None:
+        return None
+    if not isinstance(payload, dict):
+        logger.warning(
+            "Skipping channel default_config for {}: expected dict, got {}",
+            channel_cls,
+            type(payload).__name__,
+        )
+        return None
+    return payload
+
+
 def _onboard_plugins(config_path: Path) -> None:
     """Inject default config for all discovered channels (built-in + plugins)."""
     import json
@@ -352,13 +375,13 @@ def _onboard_plugins(config_path: Path) -> None:
 
     channels = data.setdefault("channels", {})
     for name, cls in all_channels.items():
-        default_config = getattr(cls, "default_config", None)
-        if not callable(default_config):
+        payload = _resolve_channel_default_config(cls)
+        if payload is None:
             continue
         if name not in channels:
-            channels[name] = default_config()
+            channels[name] = payload
         else:
-            channels[name] = _merge_missing_defaults(channels[name], default_config())
+            channels[name] = _merge_missing_defaults(channels[name], payload)
 
     with open(config_path, "w", encoding="utf-8") as f:
         json.dump(data, f, indent=2, ensure_ascii=False)
@@ -366,9 +389,9 @@ def _onboard_plugins(config_path: Path) -> None:
 
 def _make_provider(config: Config):
     """Create the appropriate LLM provider from config."""
+    from nanobot.providers.azure_openai_provider import AzureOpenAIProvider
     from nanobot.providers.base import GenerationSettings
     from nanobot.providers.openai_codex_provider import OpenAICodexProvider
-    from nanobot.providers.azure_openai_provider import AzureOpenAIProvider
 
     model = config.agents.defaults.model
     provider_name = config.get_provider_name(model)
diff --git a/tests/test_base_channel.py b/tests/test_base_channel.py
index 5d10d4e..aeb7ea8 100644
--- a/tests/test_base_channel.py
+++ b/tests/test_base_channel.py
@@ -23,3 +23,7 @@ def test_is_allowed_requires_exact_match() -> None:
 
     assert channel.is_allowed("allow@email.com") is True
     assert channel.is_allowed("attacker|allow@email.com") is False
+
+
+def test_default_config_returns_none_by_default() -> None:
+    assert _DummyChannel.default_config() is None
diff --git a/tests/test_channel_default_config.py b/tests/test_channel_default_config.py
new file mode 100644
index 0000000..31171fb
--- /dev/null
+++ b/tests/test_channel_default_config.py
@@ -0,0 +1,9 @@
+from nanobot.channels.registry import discover_channel_names, load_channel_class
+
+
+def test_builtin_channels_expose_default_config_dicts() -> None:
+    for module_name in sorted(discover_channel_names()):
+        channel_cls = load_channel_class(module_name)
+        payload = channel_cls.default_config()
+        assert isinstance(payload, dict), module_name
+        assert "enabled" in payload, module_name
diff --git a/tests/test_config_migration.py b/tests/test_config_migration.py
index 2a446b7..86e08aa 100644
--- a/tests/test_config_migration.py
+++ b/tests/test_config_migration.py
@@ -1,9 +1,10 @@
 import json
 from types import SimpleNamespace
 
+import pytest
 from typer.testing import CliRunner
 
-from nanobot.cli.commands import app
+from nanobot.cli.commands import _resolve_channel_default_config, app
 from nanobot.config.loader import load_config, save_config
 
 runner = CliRunner()
@@ -130,3 +131,66 @@ def test_onboard_refresh_backfills_missing_channel_fields(tmp_path, monkeypatch)
     assert result.exit_code == 0
     saved = json.loads(config_path.read_text(encoding="utf-8"))
     assert saved["channels"]["qq"]["msgFormat"] == "plain"
+
+
+@pytest.mark.parametrize(
+    ("channel_cls", "expected"),
+    [
+        (SimpleNamespace(), None),
+        (SimpleNamespace(default_config="invalid"), None),
+        (SimpleNamespace(default_config=lambda: None), None),
+        (SimpleNamespace(default_config=lambda: ["invalid"]), None),
+        (SimpleNamespace(default_config=lambda: {"enabled": False}), {"enabled": False}),
+    ],
+)
+def test_resolve_channel_default_config_validates_payload(channel_cls, expected) -> None:
+    assert _resolve_channel_default_config(channel_cls) == expected
+
+
+def test_resolve_channel_default_config_skips_exceptions() -> None:
+    def _raise() -> dict[str, object]:
+        raise RuntimeError("boom")
+
+    assert _resolve_channel_default_config(SimpleNamespace(default_config=_raise)) is None
+
+
+def test_onboard_refresh_skips_invalid_channel_default_configs(tmp_path, monkeypatch) -> None:
+    config_path = tmp_path / "config.json"
+    workspace = tmp_path / "workspace"
+    config_path.write_text(json.dumps({"channels": {}}), encoding="utf-8")
+
+    def _raise() -> dict[str, object]:
+        raise RuntimeError("boom")
+
+    monkeypatch.setattr("nanobot.config.loader.get_config_path", lambda: config_path)
+    monkeypatch.setattr("nanobot.cli.commands.get_workspace_path", lambda _workspace=None: workspace)
+    monkeypatch.setattr(
+        "nanobot.channels.registry.discover_all",
+        lambda: {
+            "missing": SimpleNamespace(),
+            "noncallable": SimpleNamespace(default_config="invalid"),
+            "none": SimpleNamespace(default_config=lambda: None),
+            "wrong_type": SimpleNamespace(default_config=lambda: ["invalid"]),
+            "raises": SimpleNamespace(default_config=_raise),
+            "qq": SimpleNamespace(
+                default_config=lambda: {
+                    "enabled": False,
+                    "appId": "",
+                    "secret": "",
+                    "allowFrom": [],
+                    "msgFormat": "plain",
+                }
+            ),
+        },
+    )
+
+    result = runner.invoke(app, ["onboard"], input="n\n")
+
+    assert result.exit_code == 0
+    saved = json.loads(config_path.read_text(encoding="utf-8"))
+    assert "missing" not in saved["channels"]
+    assert "noncallable" not in saved["channels"]
+    assert "none" not in saved["channels"]
+    assert "wrong_type" not in saved["channels"]
+    assert "raises" not in saved["channels"]
+    assert saved["channels"]["qq"]["msgFormat"] == "plain"