diff --git a/astrbot/core/conversation_mgr.py b/astrbot/core/conversation_mgr.py
index 499e21994..210d0784f 100644
--- a/astrbot/core/conversation_mgr.py
+++ b/astrbot/core/conversation_mgr.py
@@ -7,6 +7,8 @@
 import json
 from collections.abc import Awaitable, Callable
 
+from deprecated import deprecated
+
 from astrbot.core import sp
 from astrbot.core.agent.message import AssistantMessageSegment, UserMessageSegment
 from astrbot.core.db import BaseDatabase
@@ -304,6 +306,7 @@ class ConversationManager:
                 token_usage=token_usage,
             )
 
+    @deprecated(reason="Use update_conversation() with the title parameter instead.")
     async def update_conversation_title(
         self,
         unified_msg_origin: str,
@@ -326,6 +329,9 @@ class ConversationManager:
             title=title,
         )
 
+    @deprecated(
+        reason="Use update_conversation() with the persona_id parameter instead."
+    )
     async def update_conversation_persona_id(
         self,
         unified_msg_origin: str,
diff --git a/astrbot/core/db/po.py b/astrbot/core/db/po.py
index 8a358440f..2a4a01380 100644
--- a/astrbot/core/db/po.py
+++ b/astrbot/core/db/po.py
@@ -3,6 +3,7 @@ from dataclasses import dataclass, field
 from datetime import datetime, timezone
 from typing import TypedDict
 
+from deprecated import deprecated
 from sqlalchemy import Index, desc
 from sqlmodel import JSON, Field, SQLModel, Text, UniqueConstraint
 
@@ -605,6 +606,7 @@ class Personality(TypedDict):
 # ====
 
 
+@deprecated(version="4.0.0", reason="Use PlatformStat instead.")
 @dataclass
 class Platform:
     """平台使用统计数据"""
@@ -614,6 +616,7 @@ class Platform:
     timestamp: int
 
 
+@deprecated(version="4.0.0", reason="Use get_platform_stats() instead.")
 @dataclass
 class Stats:
     platform: list[Platform] = field(default_factory=list)
diff --git a/astrbot/core/db/sqlite.py b/astrbot/core/db/sqlite.py
index ec35a6a5b..71940a05e 100644
--- a/astrbot/core/db/sqlite.py
+++ b/astrbot/core/db/sqlite.py
@@ -5,6 +5,7 @@ import typing as T
 from collections.abc import Awaitable, Callable
 from datetime import datetime, timedelta, timezone
 
+from deprecated import deprecated
 from sqlalchemy import CursorResult, Row, not_
 from sqlalchemy.dialects.sqlite import dialect as sqlite_dialect
 from sqlalchemy.ext.asyncio import AsyncSession
@@ -1646,6 +1647,7 @@ class SQLiteDatabase(BaseDatabase):
     # Deprecated Methods
     # ====
 
+    @deprecated(version="4.0.0", reason="Use get_platform_stats instead")
     def get_base_stats(self, offset_sec=86400):
         """Get base statistics within the specified offset in seconds."""
 
@@ -1680,6 +1682,7 @@ class SQLiteDatabase(BaseDatabase):
         t.join()
         return result
 
+    @deprecated(version="4.0.0", reason="Use get_platform_stats instead")
     def get_total_message_count(self):
         """Get the total message count from platform statistics."""
 
@@ -1703,6 +1706,7 @@ class SQLiteDatabase(BaseDatabase):
         t.join()
         return result
 
+    @deprecated(version="4.0.0", reason="Use get_platform_stats instead")
     def get_grouped_base_stats(self, offset_sec=86400):
         # group by platform_id
         async def _inner():
diff --git a/astrbot/core/message/components.py b/astrbot/core/message/components.py
index f0d0a8cbd..0916c1452 100644
--- a/astrbot/core/message/components.py
+++ b/astrbot/core/message/components.py
@@ -30,6 +30,8 @@ import uuid
 from enum import Enum
 from pathlib import Path, PurePosixPath
 
+from deprecated import deprecated
+
 if sys.version_info >= (3, 14):
     from pydantic import BaseModel
 else:
@@ -711,6 +713,7 @@ class Nodes(BaseMessageComponent):
     def __init__(self, nodes: list[Node], **_) -> None:
         super().__init__(nodes=nodes, **_)
 
+    @deprecated(reason="Use to_dict instead.")
     def toDict(self):
         """Deprecated. Use to_dict instead"""
         ret = {
diff --git a/astrbot/core/platform/astr_message_event.py b/astrbot/core/platform/astr_message_event.py
index bd9ae48b2..0fbddf35f 100644
--- a/astrbot/core/platform/astr_message_event.py
+++ b/astrbot/core/platform/astr_message_event.py
@@ -8,6 +8,8 @@ from collections.abc import AsyncGenerator
 from time import time
 from typing import Any
 
+from deprecated import deprecated
+
 from astrbot import logger
 from astrbot.core.agent.tool import ToolSet
 from astrbot.core.db.po import Conversation
@@ -301,9 +303,11 @@ class AstrMessageEvent(abc.ABC):
         默认实现为空，由具体平台按需重写。
         """
 
+    @deprecated(version="3.5.18", reason="No longer invoked by the message scheduler.")
     async def _pre_send(self) -> None:
         """调度器会在执行 send() 前调用该方法 deprecated in v3.5.18"""
 
+    @deprecated(version="3.5.18", reason="No longer invoked by the message scheduler.")
     async def _post_send(self) -> None:
         """调度器会在执行 send() 后调用该方法 deprecated in v3.5.18"""
 
diff --git a/astrbot/core/platform/sources/misskey/misskey_utils.py b/astrbot/core/platform/sources/misskey/misskey_utils.py
index ab5b336bf..c8ec3a147 100644
--- a/astrbot/core/platform/sources/misskey/misskey_utils.py
+++ b/astrbot/core/platform/sources/misskey/misskey_utils.py
@@ -2,6 +2,8 @@
 
 from typing import Any
 
+from deprecated import deprecated
+
 import astrbot.api.message_components as Comp
 from astrbot.api.platform import AstrBotMessage, MessageMember, MessageType
 from astrbot.core.utils.media_utils import MediaResolver
@@ -174,6 +176,7 @@ def resolve_message_visibility(
 
 
 # 保留旧函数名作为向后兼容的别名
+@deprecated(reason="Use resolve_message_visibility instead.")
 def resolve_visibility_from_raw_message(
     raw_message: dict[str, Any],
     self_id: str | None = None,
diff --git a/astrbot/core/provider/entities.py b/astrbot/core/provider/entities.py
index 5d20ad65c..ee15434e5 100644
--- a/astrbot/core/provider/entities.py
+++ b/astrbot/core/provider/entities.py
@@ -6,6 +6,7 @@ from dataclasses import dataclass, field
 from typing import Any
 
 from anthropic.types import Message as AnthropicMessage
+from deprecated import deprecated
 from google.genai.types import GenerateContentResponse
 from openai.types.chat.chat_completion import ChatCompletion
 
@@ -400,6 +401,7 @@ class LLMResponse:
         else:
             self._completion_text = value
 
+    @deprecated(reason="Use to_openai_to_calls_model instead.")
     def to_openai_tool_calls(self) -> list[dict]:
         """Convert to OpenAI tool calls format. Deprecated, use to_openai_to_calls_model instead."""
         ret = []
diff --git a/astrbot/core/provider/func_tool_manager.py b/astrbot/core/provider/func_tool_manager.py
index f8ffbd4ab..216aa084c 100644
--- a/astrbot/core/provider/func_tool_manager.py
+++ b/astrbot/core/provider/func_tool_manager.py
@@ -12,6 +12,7 @@ from types import MappingProxyType
 from typing import Any
 
 import aiohttp
+from deprecated import deprecated
 
 from astrbot import logger
 from astrbot.core import sp
@@ -328,6 +329,7 @@ class FunctionToolManager:
         return self._mcp_server_runtime_view
 
     @property
+    @deprecated(reason="Use mcp_server_runtime_view instead.")
     def mcp_server_runtime(self) -> Mapping[str, _MCPServerRuntime]:
         """Backward-compatible read-only view (deprecated). Do not mutate.
 
diff --git a/astrbot/core/provider/manager.py b/astrbot/core/provider/manager.py
index b41c55c10..c72ad9880 100644
--- a/astrbot/core/provider/manager.py
+++ b/astrbot/core/provider/manager.py
@@ -5,6 +5,8 @@ import traceback
 from collections.abc import Callable
 from typing import Protocol, runtime_checkable
 
+from deprecated import deprecated
+
 from astrbot.core import astrbot_config, logger, sp
 from astrbot.core.astrbot_config_mgr import AstrBotConfigManager
 from astrbot.core.db import BaseDatabase
@@ -136,6 +138,7 @@ class ProviderManager:
         return self.persona_mgr.personas_v3
 
     @property
+    @deprecated(reason="Use persona_mgr.get_default_persona_v3() instead.")
     def selected_default_persona(self):
         """动态获取最新的默认选中 persona。已弃用，请使用 context.persona_mgr.get_default_persona_v3()"""
         return self.persona_mgr.selected_default_persona_v3
diff --git a/astrbot/core/star/context.py b/astrbot/core/star/context.py
index 856b349bc..3feae2461 100644
--- a/astrbot/core/star/context.py
+++ b/astrbot/core/star/context.py
@@ -684,6 +684,7 @@ class Context:
         """
         self.provider_manager.provider_insts.append(provider)
 
+    @deprecated(reason="Use decorator-based tool registration instead.")
     def register_llm_tool(
         self,
         name: str,
@@ -716,6 +717,7 @@ class Context:
         star_handlers_registry.append(md)
         self.provider_manager.llm_tools.add_func(name, func_args, desc, func_obj)
 
+    @deprecated(reason="Use deactivate_llm_tool() to disable a tool instead.")
     def unregister_llm_tool(self, name: str) -> None:
         """[DEPRECATED]删除一个函数调用工具。
 
@@ -728,6 +730,7 @@ class Context:
         """
         self.provider_manager.llm_tools.remove_func(name)
 
+    @deprecated(reason="Use the command decorator (@filter.command) instead.")
     def register_commands(
         self,
         star_name: str,
@@ -769,6 +772,9 @@ class Context:
             )
         star_handlers_registry.append(md)
 
+    @deprecated(
+        reason="Start background tasks in the plugin's initialize() method instead."
+    )
     def register_task(self, task: Awaitable, desc: str) -> None:
         """[DEPRECATED]注册一个异步任务。
 
diff --git a/astrbot/core/utils/shared_preferences.py b/astrbot/core/utils/shared_preferences.py
index 344808cbd..e35987a3a 100644
--- a/astrbot/core/utils/shared_preferences.py
+++ b/astrbot/core/utils/shared_preferences.py
@@ -5,6 +5,7 @@ from collections import defaultdict
 from typing import Any, TypeVar, overload
 
 from apscheduler.schedulers.background import BackgroundScheduler
+from deprecated import deprecated
 
 from astrbot.core.db import BaseDatabase
 from astrbot.core.db.po import Preference
@@ -166,6 +167,10 @@ class SharedPreferences:
     # DEPRECATED METHODS
     # ====
 
+    @deprecated(
+        version="4.0.0",
+        reason="Use get_async() instead. Plugins: use PluginKVStoreMixin.get_kv_data().",
+    )
     def get(
         self,
         key: str,
@@ -188,6 +193,7 @@ class SharedPreferences:
 
         return result if result is not None else default
 
+    @deprecated(version="4.0.0", reason="Use range_get_async() instead.")
     def range_get(
         self,
         scope: str,
@@ -202,6 +208,10 @@ class SharedPreferences:
 
         return result
 
+    @deprecated(
+        version="4.0.0",
+        reason="Use put_async() instead. Plugins: use PluginKVStoreMixin.put_kv_data().",
+    )
     def put(
         self, key, value, scope: str | None = None, scope_id: str | None = None
     ) -> None:
@@ -211,6 +221,10 @@ class SharedPreferences:
             self._sync_loop,
         ).result()
 
+    @deprecated(
+        version="4.0.0",
+        reason="Use remove_async() instead. Plugins: use PluginKVStoreMixin.delete_kv_data().",
+    )
     def remove(
         self, key, scope: str | None = None, scope_id: str | None = None
     ) -> None:
@@ -220,6 +234,7 @@ class SharedPreferences:
             self._sync_loop,
         ).result()
 
+    @deprecated(version="4.0.0", reason="Use clear_async() instead.")
     def clear(self, scope: str | None = None, scope_id: str | None = None) -> None:
         """清空偏好设置（已弃用）"""
         asyncio.run_coroutine_threadsafe(