diff --git a/reme_ai/core/__init__.py b/reme_ai/core/__init__.py
index e69de29b..f04f16ec 100644
--- a/reme_ai/core/__init__.py
+++ b/reme_ai/core/__init__.py
@@ -0,0 +1,19 @@
+"""Core module for ReMe AI framework."""
+
+# pylint: disable=wrong-import-position
+# flake8: noqa: F401
+
+from . import agent
+from . import config
+from . import context
+from . import embedding
+from . import enumeration
+from . import flow
+from . import llm
+from . import op
+from . import schema
+from . import service
+from . import token_counter
+from . import tool
+from . import utils
+from . import vector_store
diff --git a/reme_ai/core/agent/__init__.py b/reme_ai/core/agent/__init__.py
new file mode 100644
index 00000000..5ecdd48b
--- /dev/null
+++ b/reme_ai/core/agent/__init__.py
@@ -0,0 +1,9 @@
+"""Agent module providing chat operations."""
+
+from .simple_chat import SimpleChat
+from .stream_chat import StreamChat
+
+__all__ = [
+    "StreamChat",
+    "SimpleChat",
+]
diff --git a/reme_ai/core/agent/simple_chat.py b/reme_ai/core/agent/simple_chat.py
new file mode 100644
index 00000000..8dd1b8db
--- /dev/null
+++ b/reme_ai/core/agent/simple_chat.py
@@ -0,0 +1,62 @@
+"""Simple chat agent for non-streaming conversations."""
+
+from loguru import logger
+
+from ..context import C
+from ..enumeration import Role
+from ..op import BaseOp
+from ..schema import Message, ToolCall
+
+
+@C.register_op()
+class SimpleChat(BaseOp):
+    """Simple chat agent that handles non-streaming conversations."""
+
+    def _build_tool_call(self) -> ToolCall:
+        return ToolCall(
+            **{
+                "description": "simple chat agent",
+                "parameters": {
+                    "type": "object",
+                    "properties": {
+                        "query": {
+                            "type": "string",
+                            "description": "query",
+                        },
+                        "messages": {
+                            "type": "array",
+                            "items": {
+                                "type": "object",
+                                "properties": {
+                                    "role": {
+                                        "type": "string",
+                                        "description": "role",
+                                    },
+                                    "content": {
+                                        "type": "string",
+                                        "description": "content",
+                                    },
+                                },
+                                "required": ["role", "content"],
+                            },
+                        },
+                    },
+                    "required": [],
+                },
+            },
+        )
+
+    async def execute(self):
+        if "query" in self.context:
+            messages = [
+                Message(role=Role.SYSTEM, content="You are a helpful assistant."),
+                Message(role=Role.USER, content=self.context.query),
+            ]
+        elif "messages" in self.context:
+            messages = [Message(**m) if isinstance(m, dict) else m for m in self.context.messages if m]
+        else:
+            raise ValueError("query or messages must be provided!")
+        logger.info(f"messages={messages}")
+        assistant_message = await self.llm.chat(messages=messages)
+        logger.info(f"assistant_message={assistant_message.simple_dump()}")
+        self.output = assistant_message.content
diff --git a/reme_ai/core/agent/stream_chat.py b/reme_ai/core/agent/stream_chat.py
new file mode 100644
index 00000000..7676ed04
--- /dev/null
+++ b/reme_ai/core/agent/stream_chat.py
@@ -0,0 +1,64 @@
+"""Streaming chat agent for real-time conversation streaming."""
+
+from loguru import logger
+
+from ..context import C
+from ..enumeration import Role, ChunkEnum
+from ..op import BaseOp
+from ..schema import Message, ToolCall
+
+
+@C.register_op()
+class StreamChat(BaseOp):
+    """Streaming chat agent that handles real-time conversation streaming."""
+
+    def _build_tool_call(self) -> ToolCall:
+        return ToolCall(
+            **{
+                "description": "simple chat agent",
+                "parameters": {
+                    "type": "object",
+                    "properties": {
+                        "query": {
+                            "type": "string",
+                            "description": "query",
+                        },
+                        "messages": {
+                            "type": "array",
+                            "items": {
+                                "type": "object",
+                                "properties": {
+                                    "role": {
+                                        "type": "string",
+                                        "description": "role",
+                                    },
+                                    "content": {
+                                        "type": "string",
+                                        "description": "content",
+                                    },
+                                },
+                                "required": ["role", "content"],
+                            },
+                        },
+                    },
+                    "required": [],
+                },
+            },
+        )
+
+    async def execute(self):
+        """Execute streaming chat operation with query or messages."""
+        if "query" in self.context:
+            messages = [
+                Message(role=Role.SYSTEM, content="You are a helpful assistant."),
+                Message(role=Role.USER, content=self.context.query),
+            ]
+        elif "messages" in self.context:
+            messages = [Message(**m) if isinstance(m, dict) else m for m in self.context.messages if m]
+        else:
+            raise ValueError("query or messages must be provided!")
+        logger.info(f"messages={messages}")
+
+        async for stream_chunk in self.llm.stream_chat(messages):
+            if stream_chunk.chunk_type in [ChunkEnum.ANSWER, ChunkEnum.THINK, ChunkEnum.ERROR, ChunkEnum.TOOL]:
+                await self.context.add_stream_chunk(stream_chunk)
diff --git a/reme_ai/core/application.py b/reme_ai/core/application.py
index e15f4fcf..285fb78a 100644
--- a/reme_ai/core/application.py
+++ b/reme_ai/core/application.py
@@ -6,7 +6,7 @@ import os
 from .context import C
 from .flow import BaseFlow
 from .schema import ServiceConfig, Response
-from .utils import PydanticConfigParser, init_logger, execute_stream_task, run_coro_safely
+from .utils import PydanticConfigParser, init_logger, execute_stream_task, run_coro_safely, load_env
 
 
 class Application:
@@ -52,6 +52,8 @@ class Application:
             token_counter: Token counter configuration dictionary
             **kwargs: Additional configuration arguments
         """
+
+        load_env()
         self._update_env("REME_LLM_API_KEY", llm_api_key)
         self._update_env("REME_LLM_BASE_URL", llm_api_base)
         self._update_env("REME_EMBEDDING_API_KEY", embedding_api_key)
@@ -195,9 +197,9 @@ class Application:
         task = asyncio.create_task(flow.call(stream_queue=stream_queue, **kwargs))
 
         async for chunk in execute_stream_task(
-            queue=stream_queue,
+            stream_queue=stream_queue,
             task=task,
-            flow_name=name,
+            task_name=name,
             as_bytes=False,
         ):
             yield chunk
diff --git a/reme_ai/core/config/default.yaml b/reme_ai/core/config/default.yaml
index cd04da1d..8209216d 100644
--- a/reme_ai/core/config/default.yaml
+++ b/reme_ai/core/config/default.yaml
@@ -16,6 +16,10 @@ llm:
   default:
     backend: openai
     model_name: qwen3-30b-a3b-instruct-2507
+
+  qwen3_max_instruct:
+    backend: openai
+    model_name: qwen3-max
     temperature: 0.6
 
 embedding_model:
@@ -32,3 +36,8 @@ vector_store:
 token_counter:
   default:
     backend: base
+
+  hf:
+    backend: hf
+    model_name: Qwen/Qwen3-Coder-30B-A3B-Instruct
+    use_mirror: true
diff --git a/reme_ai/core/main.py b/reme_ai/core/main.py
new file mode 100644
index 00000000..81811c1f
--- /dev/null
+++ b/reme_ai/core/main.py
@@ -0,0 +1,48 @@
+"""ReMe application classes for simplified configuration and execution."""
+
+import sys
+
+from .application import Application
+from .config import ReMeConfigParser
+
+
+class ReMeApp(Application):
+    """ReMe application with config file support and flow execution methods."""
+
+    def __init__(
+        self,
+        *args,
+        llm_api_key: str | None = None,
+        llm_api_base: str | None = None,
+        embedding_api_key: str | None = None,
+        embedding_api_base: str | None = None,
+        config_path: str | None = None,
+        enable_logo: bool = True,
+        **kwargs,
+    ):
+        super().__init__(
+            *args,
+            llm_api_key=llm_api_key,
+            llm_api_base=llm_api_base,
+            embedding_api_key=embedding_api_key,
+            embedding_api_base=embedding_api_base,
+            service_config=None,
+            parser=ReMeConfigParser,
+            config_path=config_path,
+            enable_logo=enable_logo,
+            **kwargs,
+        )
+
+    async def async_execute(self, name: str, **kwargs) -> dict:
+        """Execute a flow asynchronously and return the result as a dictionary."""
+        return (await self.execute_flow(name=name, **kwargs)).model_dump()
+
+
+def main():
+    """Main entry point for running ReMe application from command line."""
+    with ReMeApp(*sys.argv[1:]) as app:
+        app.run_service()
+
+
+if __name__ == "__main__":
+    main()
diff --git a/reme_ai/core/op/base_op.py b/reme_ai/core/op/base_op.py
index 7eeb5fbd..bc62be87 100644
--- a/reme_ai/core/op/base_op.py
+++ b/reme_ai/core/op/base_op.py
@@ -40,6 +40,7 @@ class BaseOp:
         token_counter: str | BaseTokenCounter = "default",
         enable_cache: bool = False,
         cache_path: str = "cache/op",
+        cache_expire_hours: float = 0.1,
         sub_ops: dict[str, "BaseOp"] | list["BaseOp"] | Optional["BaseOp"] = None,
         input_mapping: dict[str, str] | None = None,
         output_mapping: dict[str, str] | None = None,
@@ -62,6 +63,7 @@ class BaseOp:
 
         self.enable_cache = enable_cache
         self.cache_path = cache_path
+        self.cache_expire_hours = cache_expire_hours
         self.sub_ops: list[BaseOp] = []
         self.add_sub_ops(sub_ops)
 
@@ -156,7 +158,10 @@ class BaseOp:
             return None
 
         keys = list(output_properties.keys())
-        return self.context[keys[0]]
+        if len(keys) >= 1 and keys[0] in self.context:
+            return self.context[keys[0]]
+        else:
+            return None
 
     @output.setter
     def output(self, value: Any):
diff --git a/reme_ai/core/reme.py b/reme_ai/core/reme.py
index d1240cb6..552a526b 100644
--- a/reme_ai/core/reme.py
+++ b/reme_ai/core/reme.py
@@ -1,6 +1,4 @@
-"""ReMe application classes for simplified configuration and execution."""
-
-import sys
+"""ReMe classes for simplified configuration and execution."""
 
 from .application import Application
 from .config import ReMeConfigParser
@@ -48,45 +46,3 @@ class ReMe(Application):
 
     async def retrieve(self):
         """Execute retrieve operations."""
-
-
-class ReMeApp(Application):
-    """ReMe application with config file support and flow execution methods."""
-
-    def __init__(
-        self,
-        *args,
-        llm_api_key: str | None = None,
-        llm_api_base: str | None = None,
-        embedding_api_key: str | None = None,
-        embedding_api_base: str | None = None,
-        config_path: str | None = None,
-        enable_logo: bool = True,
-        **kwargs,
-    ):
-        super().__init__(
-            *args,
-            llm_api_key=llm_api_key,
-            llm_api_base=llm_api_base,
-            embedding_api_key=embedding_api_key,
-            embedding_api_base=embedding_api_base,
-            service_config=None,
-            parser=ReMeConfigParser,
-            config_path=config_path,
-            enable_logo=enable_logo,
-            **kwargs,
-        )
-
-    async def async_execute(self, name: str, **kwargs) -> dict:
-        """Execute a flow asynchronously and return the result as a dictionary."""
-        return (await self.execute_flow(name=name, **kwargs)).model_dump()
-
-
-def main():
-    """Main entry point for running ReMe application from command line."""
-    with ReMeApp(*sys.argv[1:]) as app:
-        app.run_service()
-
-
-if __name__ == "__main__":
-    main()
diff --git a/reme_ai/core/service/http_service.py b/reme_ai/core/service/http_service.py
index f63d7333..8ef5d4ce 100644
--- a/reme_ai/core/service/http_service.py
+++ b/reme_ai/core/service/http_service.py
@@ -51,15 +51,14 @@ class HttpService(BaseService):
         tool_call, request_model = self._prepare_route(flow)
 
         async def execute_stream_endpoint(request: request_model) -> StreamingResponse:
-            queue = asyncio.Queue()
-            # Start flow as a background task
-            task = asyncio.create_task(flow.call(stream_queue=queue, **request.model_dump(exclude_none=True)))
+            stream_queue = asyncio.Queue()
+            task = asyncio.create_task(flow.call(stream_queue=stream_queue, **request.model_dump(exclude_none=True)))
 
             async def generate_stream() -> AsyncGenerator[bytes, None]:
                 async for chunk in execute_stream_task(
-                    queue=queue,
+                    stream_queue=stream_queue,
                     task=task,
-                    flow_name=tool_call.name,
+                    task_name=tool_call.name,
                     as_bytes=True,
                 ):
                     yield chunk
diff --git a/reme_ai/core/tool/__init__.py b/reme_ai/core/tool/__init__.py
index 02dbd468..2b6bf84b 100644
--- a/reme_ai/core/tool/__init__.py
+++ b/reme_ai/core/tool/__init__.py
@@ -1,7 +1,9 @@
 """tool"""
 
 from .mcp_tool import MCPTool
+from . import search
 
 __all__ = [
     "MCPTool",
+    "search",
 ]
diff --git a/reme_ai/core/tool/execute/__init__.py b/reme_ai/core/tool/execute/__init__.py
new file mode 100644
index 00000000..f78a73ac
--- /dev/null
+++ b/reme_ai/core/tool/execute/__init__.py
@@ -0,0 +1,9 @@
+"""execute tool"""
+
+from .execute_code import ExecuteCode
+from .execute_shell import ExecuteShell
+
+__all__ = [
+    "ExecuteCode",
+    "ExecuteShell",
+]
diff --git a/reme_ai/core/tool/execute/execute_code.py b/reme_ai/core/tool/execute/execute_code.py
new file mode 100644
index 00000000..02dc01a3
--- /dev/null
+++ b/reme_ai/core/tool/execute/execute_code.py
@@ -0,0 +1,43 @@
+"""Code execution tool for running Python code dynamically.
+
+This module provides an operation that can execute Python code strings
+and return the output or error messages.
+"""
+
+from ...context import C
+from ...op import BaseOp
+from ...schema import ToolCall
+
+from ...utils import exec_code
+
+
+@C.register_op()
+class ExecuteCode(BaseOp):
+    """Operation for executing Python code dynamically.
+
+    This operation takes Python code as input, executes it in a safe context,
+    and returns the output or any error messages that occur during execution.
+    """
+
+    def _build_tool_call(self) -> ToolCall:
+        return ToolCall(
+            **{
+                "description": self.get_prompt("tool"),
+                "parameters": {
+                    "type": "object",
+                    "properties": {
+                        "code": {
+                            "type": "string",
+                            "description": "code",
+                        },
+                    },
+                    "required": ["code"],
+                },
+            },
+        )
+
+    async def execute(self):
+        self.execute_sync()
+
+    def execute_sync(self):
+        self.output = exec_code(self.context.code)
diff --git a/reme_ai/core/tool/execute/execute_code.yaml b/reme_ai/core/tool/execute/execute_code.yaml
new file mode 100644
index 00000000..fdaef055
--- /dev/null
+++ b/reme_ai/core/tool/execute/execute_code.yaml
@@ -0,0 +1,5 @@
+tool: |
+  Execute python code can be used in scenarios such as analysis or calculation, and the final result can be printed using the `print` function.
+
+tool_zh: |
+  执行 Python 代码可用于分析或计算等场景，最终结果可以使用 print 函数输出。
\ No newline at end of file
diff --git a/reme_ai/core/tool/execute/execute_shell.py b/reme_ai/core/tool/execute/execute_shell.py
new file mode 100644
index 00000000..63a31e2d
--- /dev/null
+++ b/reme_ai/core/tool/execute/execute_shell.py
@@ -0,0 +1,49 @@
+"""Shell command execution tool.
+
+This module provides an operation that can execute shell commands
+asynchronously and return the output, error, and exit code.
+"""
+
+from ...context import C
+from ...op import BaseOp
+from ...schema import ToolCall
+
+from ...utils import run_shell_command
+
+
+@C.register_op()
+class ExecuteShell(BaseOp):
+    """Operation for executing shell commands asynchronously.
+
+    This operation takes a shell command as input, executes it asynchronously,
+    and returns the stdout, stderr, and exit code in a formatted result.
+    """
+
+    def _build_tool_call(self) -> ToolCall:
+        return ToolCall(
+            **{
+                "description": self.get_prompt("tool"),
+                "parameters": {
+                    "type": "object",
+                    "properties": {
+                        "command": {
+                            "type": "string",
+                            "description": "command",
+                        },
+                    },
+                    "required": ["command"],
+                },
+            },
+        )
+
+    async def execute(self):
+        command: str = self.context.command
+        stdout, stderr, return_code = await run_shell_command(command)
+        result_parts = [
+            f"Command: {command}",
+            f"Output: {stdout if stdout else '(empty)'}",
+            f"Error: {stderr if stderr else '(none)'}",
+            f"Exit Code: {return_code if return_code is not None else '(none)'}",
+        ]
+
+        self.output = "\n".join(result_parts)
diff --git a/reme_ai/core/tool/execute/execute_shell.yaml b/reme_ai/core/tool/execute/execute_shell.yaml
new file mode 100644
index 00000000..6261bd8b
--- /dev/null
+++ b/reme_ai/core/tool/execute/execute_shell.yaml
@@ -0,0 +1,7 @@
+tool: |
+  A tool capable of executing shell commands can use `pwd` to check the current location, `cd` to navigate to a new directory, `ls` to view the contents of a directory, and execute scripts.
+  Note that the starting directory is always the same each time the tool is invoked. If you need to perform multiple operations within a specific directory, you must include the full path in each command, for example: `cd aa/bb && bash xxx`.
+
+tool_zh: |
+  一个能够执行 Shell 命令的工具可以使用 pwd 查看当前所在位置，使用 cd 切换到新目录，使用 ls 查看目录内容，并可执行脚本。
+  请注意，每次调用该工具时，起始目录始终相同。如果你需要在某个特定目录中执行多个操作，必须在每条命令中包含完整路径，例如：cd aa/bb && bash xxx。
\ No newline at end of file
diff --git a/reme_ai/core/tool/search/__init__.py b/reme_ai/core/tool/search/__init__.py
new file mode 100644
index 00000000..d213ee70
--- /dev/null
+++ b/reme_ai/core/tool/search/__init__.py
@@ -0,0 +1,11 @@
+"""search tool"""
+
+from .dashscope_search import DashscopeSearch
+from .mock_search import MockSearch
+from .tavily_search import TavilySearch
+
+__all__ = [
+    "DashscopeSearch",
+    "TavilySearch",
+    "MockSearch",
+]
diff --git a/reme_ai/core/tool/search/dashscope_search.py b/reme_ai/core/tool/search/dashscope_search.py
new file mode 100644
index 00000000..ec27e60c
--- /dev/null
+++ b/reme_ai/core/tool/search/dashscope_search.py
@@ -0,0 +1,111 @@
+"""Dashscope web search tool.
+
+This module provides an operation that uses Alibaba Cloud's Dashscope API
+to perform web searches with various search strategies.
+"""
+
+import os
+from typing import Literal
+
+from loguru import logger
+
+from ...context import C
+from ...op import BaseOp
+from ...schema import ToolCall
+
+
+@C.register_op()
+class DashscopeSearch(BaseOp):
+    """Operation for performing web searches using Dashscope API.
+
+    This operation uses Alibaba Cloud's Dashscope service to search the web
+    with support for different search strategies (turbo, max, agent) and
+    optional role-based prompting.
+    """
+
+    def __init__(
+        self,
+        model: str = "qwen-plus",  # qwen-flash
+        search_strategy: Literal["turbo", "max", "agent"] = "turbo",  # agent only for qwen3-max
+        enable_role_prompt: bool = True,
+        **kwargs,
+    ):
+
+        super().__init__(**kwargs)
+        self.model: str = model
+        self.search_strategy: Literal["turbo", "max", "agent"] = search_strategy
+        self.enable_role_prompt: bool = enable_role_prompt
+
+        # see ref: https://help.aliyun.com/zh/model-studio/web-search
+        self.api_key = os.getenv("DASHSCOPE_API_KEY", "")
+
+    def _build_tool_call(self) -> ToolCall:
+        return ToolCall(
+            **{
+                "description": self.get_prompt("tool"),
+                "parameters": {
+                    "type": "object",
+                    "properties": {
+                        "query": {
+                            "type": "string",
+                            "description": "query",
+                        },
+                    },
+                    "required": ["query"],
+                },
+            },
+        )
+
+    async def execute(self):
+        query: str = self.context.query
+        if self.enable_cache:
+            cached_result = self.cache.load(query)
+            if cached_result:
+                self.output = cached_result["response_content"]
+                return
+
+        if self.enable_role_prompt:
+            user_query = self.prompt_format("role_prompt", query=query)
+        else:
+            user_query = query
+        logger.info(f"user_query={user_query}")
+        messages: list = [{"role": "user", "content": user_query}]
+
+        import dashscope
+
+        response = await dashscope.AioGeneration.call(
+            api_key=self.api_key,
+            model=self.model,
+            messages=messages,
+            enable_search=True,
+            search_options={
+                "forced_search": True,
+                "enable_source": True,
+                "enable_citation": False,
+                "search_strategy": self.search_strategy,
+            },
+            result_format="message",
+        )
+
+        search_results = []
+        response_content = ""
+
+        if response.output:
+            if response.output.search_info:
+                search_results = response.output.search_info.get("search_results", [])
+
+            if response.output.choices and len(response.output.choices) > 0:
+                response_content = response.output.choices[0].message.content
+
+        final_result = {
+            "query": query,
+            "search_results": search_results,
+            "response_content": response_content,
+            "model": self.model,
+            "search_strategy": self.search_strategy,
+        }
+
+        if self.enable_cache:
+            self.cache.save(query, final_result, expire_hours=self.cache_expire_hours)
+
+        self.output = final_result["response_content"]
diff --git a/reme_ai/core/tool/search/dashscope_search.yaml b/reme_ai/core/tool/search/dashscope_search.yaml
new file mode 100644
index 00000000..0dcef347
--- /dev/null
+++ b/reme_ai/core/tool/search/dashscope_search.yaml
@@ -0,0 +1,20 @@
+tool: |
+  Use search keywords to retrieve relevant information from the internet.
+  If you have multiple keywords, please call this tool separately for each one.
+
+tool_zh: |
+  使用搜索关键词从互联网检索相关信息。如果您有多个关键词，请分别为每个关键词单独调用此工具。
+
+role_prompt: |
+  # user's question
+  {query}
+
+  # task
+  Extract the original content related to the user's query directly from the context, maintain accuracy, and avoid excessive processing.
+
+role_prompt_zh: |
+  # 用户问题
+  {query}
+
+  # task
+  直接从上下文中提取与用户问题相关的原始内容，保持准确性，避免过度处理。
\ No newline at end of file
diff --git a/reme_ai/core/tool/search/mock_search.py b/reme_ai/core/tool/search/mock_search.py
new file mode 100644
index 00000000..b08956c0
--- /dev/null
+++ b/reme_ai/core/tool/search/mock_search.py
@@ -0,0 +1,64 @@
+"""Mock search tool for testing purposes.
+
+This module provides a mock search operation that generates simulated
+search results using an LLM, useful for testing without making actual API calls.
+"""
+
+import json
+import random
+
+from loguru import logger
+
+from ...context import C
+from ...enumeration import Role
+from ...op import BaseOp
+from ...schema import ToolCall, Message
+from ...utils import extract_content
+
+
+@C.register_op()
+class MockSearch(BaseOp):
+    """Operation for generating mock search results.
+
+    This operation generates simulated search results using an LLM,
+    useful for testing and development without requiring actual search API access.
+    """
+
+    def _build_tool_call(self) -> ToolCall:
+        return ToolCall(
+            **{
+                "description": self.get_prompt("tool"),
+                "parameters": {
+                    "type": "object",
+                    "properties": {
+                        "query": {
+                            "type": "string",
+                            "description": "query",
+                        },
+                    },
+                    "required": ["query"],
+                },
+            },
+        )
+
+    async def execute(self):
+        query: str = self.context.query
+        num_results: int = random.randint(0, 5)
+        messages = [
+            Message(
+                role=Role.SYSTEM,
+                content="You are a helpful assistant that generates realistic search results in JSON format.",
+            ),
+            Message(
+                role=Role.USER,
+                content=self.prompt_format("mock_search_prompt", query=query, num_results=num_results),
+            ),
+        ]
+
+        logger.info(f"messages={messages}")
+
+        def callback_fn(message: Message):
+            return extract_content(message.content, "json")
+
+        search_results: str = await self.llm.chat(messages=messages, callback_fn=callback_fn)
+        self.output = json.dumps(search_results, ensure_ascii=False, indent=2)
diff --git a/reme_ai/core/tool/search/mock_search.yaml b/reme_ai/core/tool/search/mock_search.yaml
new file mode 100644
index 00000000..c952ff20
--- /dev/null
+++ b/reme_ai/core/tool/search/mock_search.yaml
@@ -0,0 +1,81 @@
+tool: |
+  Use search keywords to retrieve relevant information from the internet.
+  If you have multiple keywords, please call this tool separately for each one.
+
+tool_zh: |
+  使用搜索关键词从互联网检索相关信息。如果您有多个关键词，请分别为每个关键词单独调用此工具。
+
+
+mock_search_prompt: |
+  # Task
+  Generate {num_results} realistic search results for the query: "{query}".
+
+  # Fields per item
+  Each result must be a JSON object with fields:
+  - snippet: 2-3 sentence summary
+  - title: page title
+  - url: realistic URL (e.g., https://example.com/article/title)
+  - hostname: domain (e.g., example.com)
+  - hostlogo: logo URL (e.g., https://example.com/logo.png) or empty string
+
+  # Requirements
+  - Ensure relevance to the query
+  - Use diverse, realistic sources
+  - Ensure well-formed URLs
+  - If no relevant results, return an empty array
+
+  # Output Format
+  First, think briefly about good sources and angles:
+  ``` think
+  your brief reasoning here
+  ```
+
+  Then output ONLY the JSON array wrapped in a json code block, nothing else:
+  ``` json
+  [
+    {{
+      "snippet": "核心内容",
+      "title": "...",
+      "url": "...",
+      "hostname": "...",
+      "hostlogo": "..."
+    }}
+  ]
+  ```
+
+mock_search_prompt_zh: |
+  # 任务
+  为查询“{query}”生成 {num_results} 条逼真的搜索结果。
+
+  # 每条结果的字段
+  每条结果必须是一个包含以下字段的 JSON 对象：
+  - snippet：2–3 句话的摘要
+  - title：网页标题
+  - url：逼真的 URL（例如：https://example.com/article/title）
+  - hostname：域名（例如：example.com）
+  - hostlogo：网站 logo 的 URL（例如：https://example.com/logo.png），若无则为空字符串
+
+  # 要求
+  - 确保结果与查询相关
+  - 使用多样且真实的来源
+  - 确保 URL 格式正确
+  - 若无相关结果，则返回空数组
+
+  # 输出格式
+  首先，简要思考合适的来源和角度：
+  ``` think
+  你的简要推理写在这里
+  ```
+
+  然后仅输出一个 JSON 数组，并用 json 代码块包裹，不要包含其他任何内容：
+  ``` json
+  [
+    {
+      "snippet": "核心内容",
+      "title": "...",
+      "url": "...",
+      "hostname": "...",
+      "hostlogo": "..."
+    }
+  ]
+  ```
\ No newline at end of file
diff --git a/reme_ai/core/tool/search/tavily_search.py b/reme_ai/core/tool/search/tavily_search.py
new file mode 100644
index 00000000..8feda12e
--- /dev/null
+++ b/reme_ai/core/tool/search/tavily_search.py
@@ -0,0 +1,119 @@
+"""Tavily web search tool.
+
+This module provides an operation that uses the Tavily API to perform
+web searches and optionally extract content from search results.
+"""
+
+import json
+import os
+
+from loguru import logger
+
+from ...context import C
+from ...op import BaseOp
+from ...schema import ToolCall
+
+
+@C.register_op()
+class TavilySearch(BaseOp):
+    """Operation for performing web searches using Tavily API.
+
+    This operation uses the Tavily search service to find web content
+    and optionally extract raw content from the results, with configurable
+    character limits for individual items and total content.
+    """
+
+    def __init__(
+        self,
+        enable_extract: bool = True,
+        item_max_char_count: int = 20000,
+        all_max_char_count: int = 50000,
+        **kwargs,
+    ):
+        super().__init__(**kwargs)
+        self.enable_extract: bool = enable_extract
+        self.item_max_char_count: int = item_max_char_count
+        self.all_max_char_count: int = all_max_char_count
+        self._client = None
+
+    def _build_tool_call(self) -> ToolCall:
+        return ToolCall(
+            **{
+                "description": self.get_prompt("tool"),
+                "parameters": {
+                    "type": "object",
+                    "properties": {
+                        "query": {
+                            "type": "string",
+                            "description": "query",
+                        },
+                    },
+                    "required": ["query"],
+                },
+            },
+        )
+
+    @property
+    def client(self):
+        """Get or create the Tavily async client instance.
+
+        Returns:
+            AsyncTavilyClient: The Tavily client instance, lazily initialized.
+        """
+        if self._client is None:
+            from tavily import AsyncTavilyClient
+
+            self._client = AsyncTavilyClient(api_key=os.environ.get("TAVILY_API_KEY", ""))
+        return self._client
+
+    async def execute(self):
+        query: str = self.context.query
+        logger.info(f"tavily_search query={query}")
+
+        if self.enable_cache:
+            cached_result = self.cache.load(query)
+            if cached_result:
+                self.output = json.dumps(cached_result, ensure_ascii=False, indent=2)
+                return
+
+        response = await self.client.search(query=query)
+        logger.info(f"tavily_search response={response}")
+
+        if not self.enable_extract:
+            if not response.get("results"):
+                raise RuntimeError("tavily return empty result")
+
+            final_result = {item["url"]: item for item in response["results"]}
+
+            if self.enable_cache and final_result:
+                self.cache.save(query, final_result, expire_hours=self.cache_expire_hours)
+
+            self.output = json.dumps(final_result, ensure_ascii=False, indent=2)
+            return
+
+        url_info_dict = {item["url"]: item for item in response["results"]}
+        response_extract = await self.client.extract(urls=[item["url"] for item in response["results"]])
+        logger.info(f"tavily.response_extract: {response_extract}")
+
+        final_result = {}
+        all_char_count = 0
+        for item in response_extract["results"]:
+            url = item["url"]
+            raw_content: str = item["raw_content"]
+            if len(raw_content) > self.item_max_char_count:
+                raw_content = raw_content[: self.item_max_char_count]
+            if all_char_count + len(raw_content) > self.all_max_char_count:
+                raw_content = raw_content[: self.all_max_char_count - all_char_count]
+
+            if raw_content:
+                final_result[url] = url_info_dict[url]
+                final_result[url]["raw_content"] = raw_content
+                all_char_count += len(raw_content)
+
+        if not final_result:
+            raise RuntimeError("tavily return empty result")
+
+        if self.enable_cache and final_result:
+            self.cache.save(query, final_result, expire_hours=self.cache_expire_hours)
+
+        self.output = json.dumps(final_result, ensure_ascii=False, indent=2)
diff --git a/reme_ai/core/tool/search/tavily_search.yaml b/reme_ai/core/tool/search/tavily_search.yaml
new file mode 100644
index 00000000..2499cedb
--- /dev/null
+++ b/reme_ai/core/tool/search/tavily_search.yaml
@@ -0,0 +1,6 @@
+tool: |
+  Use search keywords to retrieve relevant information from the internet.
+  If you have multiple keywords, please call this tool separately for each one.
+
+tool_zh: |
+  使用搜索关键词从互联网检索相关信息。如果您有多个关键词，请分别为每个关键词单独调用此工具。
\ No newline at end of file
diff --git a/reme_ai/core/utils/__init__.py b/reme_ai/core/utils/__init__.py
index 87e01299..3d3bdf9a 100644
--- a/reme_ai/core/utils/__init__.py
+++ b/reme_ai/core/utils/__init__.py
@@ -4,6 +4,7 @@ from .cache_handler import CacheHandler
 from .case_converter import snake_to_camel, camel_to_snake
 from .common_utils import run_coro_safely, execute_stream_task
 from .env_utils import load_env
+from .execute_tuils import exec_code, run_shell_command
 from .http_client import HttpClient
 from .llm_utils import extract_content, format_messages
 from .logger_utils import init_logger
@@ -21,6 +22,8 @@ __all__ = [
     "run_coro_safely",
     "execute_stream_task",
     "load_env",
+    "exec_code",
+    "run_shell_command",
     "HttpClient",
     "extract_content",
     "format_messages",
diff --git a/reme_ai/core/utils/common_utils.py b/reme_ai/core/utils/common_utils.py
index d370064d..3f171f64 100644
--- a/reme_ai/core/utils/common_utils.py
+++ b/reme_ai/core/utils/common_utils.py
@@ -26,9 +26,9 @@ def run_coro_safely(coro: Coroutine[Any, Any, Any]) -> Any | asyncio.Task[Any]:
 
 
 async def execute_stream_task(
-    queue: asyncio.Queue,
+    stream_queue: asyncio.Queue,
     task: asyncio.Task,
-    flow_name: str | None = None,
+    task_name: str | None = None,
     as_bytes: bool = False,
 ) -> AsyncGenerator[str | bytes, None]:
     """
@@ -38,9 +38,9 @@ async def execute_stream_task(
     Properly manages errors and resource cleanup.
 
     Args:
-        queue: Queue to receive StreamChunk objects from
+        stream_queue: Queue to receive StreamChunk objects from
         task: Background task executing the flow
-        flow_name: Optional flow name for logging purposes
+        task_name: Optional flow name for logging purposes
         as_bytes: If True, yield bytes for HTTP responses; if False, yield strings
 
     Yields:
@@ -51,7 +51,7 @@ async def execute_stream_task(
     try:
         while True:
             # Wait for next chunk or check if task failed
-            get_chunk = asyncio.create_task(queue.get())
+            get_chunk = asyncio.create_task(stream_queue.get())
             done, _ = await asyncio.wait({get_chunk, task}, return_when=asyncio.FIRST_COMPLETED)
 
             if get_chunk in done:
@@ -69,7 +69,7 @@ async def execute_stream_task(
                 break
 
     except Exception as e:
-        log_msg = f"Stream error in {flow_name}: {e}" if flow_name else f"Stream error: {e}"
+        log_msg = f"Stream error in {task_name}: {e}" if task_name else f"Stream error: {e}"
         logger.exception(log_msg)
 
         err = StreamChunk(chunk_type=ChunkEnum.ERROR, chunk=str(e), done=True)
diff --git a/reme_ai/core/utils/execute_tuils.py b/reme_ai/core/utils/execute_tuils.py
new file mode 100644
index 00000000..a4d680ab
--- /dev/null
+++ b/reme_ai/core/utils/execute_tuils.py
@@ -0,0 +1,60 @@
+"""Utility functions for executing code and shell commands.
+
+This module provides helper functions for running Python code and shell commands,
+with support for async execution and output capture.
+"""
+
+import asyncio
+import contextlib
+from io import StringIO
+
+
+async def run_shell_command(cmd: str, timeout: float | None = 30) -> tuple[str, str, int]:
+    """Execute a shell command asynchronously.
+
+    Args:
+        cmd: The shell command to execute.
+        timeout: Maximum time to wait for command completion in seconds. None for no timeout.
+
+    Returns:
+        A tuple containing (stdout, stderr, return_code) as strings and integer.
+    """
+    process = await asyncio.create_subprocess_shell(
+        cmd,
+        stdout=asyncio.subprocess.PIPE,
+        stderr=asyncio.subprocess.PIPE,
+    )
+
+    if timeout:
+        stdout, stderr = await asyncio.wait_for(process.communicate(), timeout=timeout)
+    else:
+        stdout, stderr = await process.communicate()
+
+    return (
+        stdout.decode("utf-8", errors="ignore"),
+        stderr.decode("utf-8", errors="ignore"),
+        process.returncode,
+    )
+
+
+def exec_code(code: str) -> str:
+    """Execute Python code and capture the output.
+
+    Args:
+        code: The Python code string to execute.
+
+    Returns:
+        The captured stdout output, or the error message if execution fails.
+    """
+    try:
+        redirected_output = StringIO()
+        with contextlib.redirect_stdout(redirected_output):
+            exec(code)
+
+        return redirected_output.getvalue()
+
+    except Exception as e:
+        return str(e)
+
+    except BaseException as e:
+        return str(e)
diff --git a/tests/test_tool.py b/tests/test_tool.py
new file mode 100644
index 00000000..e35caef8
--- /dev/null
+++ b/tests/test_tool.py
@@ -0,0 +1,196 @@
+"""Tests for tool operations including search and execution tools.
+
+This module contains test functions for various tool operations such as
+search tools (Dashscope, Mock, Tavily) and execution tools (Code, Shell).
+"""
+
+# pylint: disable=too-many-statements
+
+import asyncio
+
+from reme_ai.core.reme import ReMe
+
+ReMe()
+
+
+def test_search():
+    """Test search tool operations.
+
+    Tests DashscopeSearch, MockSearch, and TavilySearch operations
+    with a sample query to verify they work correctly.
+    """
+    from reme_ai.core.tool.search import DashscopeSearch, MockSearch, TavilySearch
+
+    query = "今天杭州的天气如何？"
+
+    for op in [
+        DashscopeSearch(),
+        MockSearch(),
+        TavilySearch(),
+    ]:
+        print("\n" + "=" * 60)
+        print(f"Testing {op.__class__.__name__}")
+        print("=" * 60)
+        print(f"Query: {query}")
+        asyncio.run(op.call(query=query))
+        print(f"Output:\n{op.output}")
+
+
+def test_execute():
+    """Test code and shell execution tool operations.
+
+    Tests ExecuteCode and ExecuteShell operations with various scenarios
+    including successful execution, syntax errors, runtime errors, and
+    invalid commands to verify error handling.
+    """
+    from reme_ai.core.tool.execute import ExecuteCode, ExecuteShell
+
+    # Test ExecuteCode
+    print("\n" + "=" * 60)
+    print("Testing ExecuteCode")
+    print("=" * 60)
+
+    op = ExecuteCode()
+    code_to_execute = "print('hello world')"
+    print(f"Executing Python code: {code_to_execute}")
+    asyncio.run(op.call(code=code_to_execute))
+    print(f"Output:\n{op.output}")
+
+    # Test ExecuteCode with more complex code
+    print("\n" + "=" * 60)
+    print("Testing ExecuteCode with calculation")
+    print("=" * 60)
+
+    op = ExecuteCode()
+    code_to_execute = "result = sum(range(1, 11))\nprint(f'Sum of 1-10: {result}')"
+    print(f"Executing Python code:\n{code_to_execute}")
+    asyncio.run(op.call(code=code_to_execute))
+    print(f"Output:\n{op.output}")
+
+    # Test ExecuteShell
+    print("\n" + "=" * 60)
+    print("Testing ExecuteShell")
+    print("=" * 60)
+
+    op = ExecuteShell()
+    command = "ls"
+    print(f"Executing shell command: {command}")
+    asyncio.run(op.call(command=command))
+    print(f"Output:\n{op.output}")
+
+    # Test ExecuteShell with echo
+    print("\n" + "=" * 60)
+    print("Testing ExecuteShell with echo")
+    print("=" * 60)
+
+    op = ExecuteShell()
+    command = "echo 'Hello from shell!'"
+    print(f"Executing shell command: {command}")
+    asyncio.run(op.call(command=command))
+    print(f"Output:\n{op.output}")
+
+    # Test ExecuteCode with error (syntax error)
+    print("\n" + "=" * 60)
+    print("Testing ExecuteCode with syntax error (expected to fail)")
+    print("=" * 60)
+
+    op = ExecuteCode()
+    code_to_execute = "print('missing closing quote)"
+    print(f"Executing Python code with syntax error:\n{code_to_execute}")
+    asyncio.run(op.call(code=code_to_execute))
+    print(f"Output:\n{op.output}")
+
+    # Test ExecuteCode with runtime error
+    print("\n" + "=" * 60)
+    print("Testing ExecuteCode with runtime error (expected to fail)")
+    print("=" * 60)
+
+    op = ExecuteCode()
+    code_to_execute = "x = 1 / 0"
+    print(f"Executing Python code with runtime error:\n{code_to_execute}")
+    asyncio.run(op.call(code=code_to_execute))
+    print(f"Output:\n{op.output}")
+
+    # Test ExecuteCode with undefined variable
+    print("\n" + "=" * 60)
+    print("Testing ExecuteCode with undefined variable (expected to fail)")
+    print("=" * 60)
+
+    op = ExecuteCode()
+    code_to_execute = "print(undefined_variable)"
+    print(f"Executing Python code with undefined variable:\n{code_to_execute}")
+    asyncio.run(op.call(code=code_to_execute))
+    print(f"Output:\n{op.output}")
+
+    # Test ExecuteShell with invalid command
+    print("\n" + "=" * 60)
+    print("Testing ExecuteShell with invalid command (expected to fail)")
+    print("=" * 60)
+
+    op = ExecuteShell()
+    command = "this_command_does_not_exist"
+    print(f"Executing invalid shell command: {command}")
+    asyncio.run(op.call(command=command))
+    print(f"Output:\n{op.output}")
+
+    # Test ExecuteShell with command that returns non-zero exit code
+    print("\n" + "=" * 60)
+    print("Testing ExecuteShell with failing command (expected to fail)")
+    print("=" * 60)
+
+    op = ExecuteShell()
+    command = "ls /nonexistent_directory_12345"
+    print(f"Executing shell command that should fail: {command}")
+    asyncio.run(op.call(command=command))
+    print(f"Output:\n{op.output}")
+
+    print("\n" + "=" * 60)
+    print("All tests completed!")
+    print("=" * 60)
+
+
+def test_simple_chat():
+    """Test simple chat operation.
+
+    Tests the SimpleChat agent with a basic query to verify
+    it can process and respond to user input.
+    """
+    from reme_ai.core.agent import SimpleChat
+
+    op = SimpleChat()
+    asyncio.run(op.call(query="你好"))
+    print(op.output)
+
+
+async def test_stream_chat():
+    """Test streaming chat operation.
+
+    Tests the StreamChat agent with a query to verify it can
+    process and stream responses in real-time using async operations.
+    """
+    from reme_ai.core.agent import StreamChat
+    from reme_ai.core.utils import execute_stream_task
+    from reme_ai.core.context import RuntimeContext
+    from asyncio import Queue
+
+    op = StreamChat()
+    context = RuntimeContext(query="你好，详细介绍一下自己", stream_queue=Queue())
+
+    async def task():
+        await op.call(context)
+        await op.context.add_stream_done()
+
+    async for chunk in execute_stream_task(
+        stream_queue=context.stream_queue,
+        task=asyncio.create_task(task()),
+        task_name="test_stream_chat",
+        as_bytes=False,
+    ):
+        print(chunk, end="")
+
+
+if __name__ == "__main__":
+    # test_search()
+    # test_execute()
+    # test_simple_chat()
+    asyncio.run(test_stream_chat())