diff --git a/examples/agent_creator.py b/examples/agent_creator.py
index e724105a37..05417d24ae 100644
--- a/examples/agent_creator.py
+++ b/examples/agent_creator.py
@@ -49,6 +49,7 @@ def parse_code(rsp):
         pattern = r"```python(.*)```"
         match = re.search(pattern, rsp, re.DOTALL)
         code_text = match.group(1) if match else ""
+        CONFIG.workspace_path.mkdir(parents=True, exist_ok=True)
         with open(CONFIG.workspace_path / "agent_created_agent.py", "w") as f:
             f.write(code_text)
         return code_text
diff --git a/examples/search_kb.py b/examples/search_kb.py
index 0b5d593857..7a9911ca22 100644
--- a/examples/search_kb.py
+++ b/examples/search_kb.py
@@ -5,17 +5,35 @@
 """
 import asyncio
 
+from metagpt.actions import Action
 from metagpt.const import DATA_PATH
 from metagpt.document_store import FaissStore
 from metagpt.logs import logger
 from metagpt.roles import Sales
+from metagpt.schema import Message
+
+""" example.json, e.g.
+[
+    {
+        "source": "Which facial cleanser is good for oily skin?",
+        "output": "ABC cleanser is preferred by many with oily skin."
+    },
+    {
+        "source": "Is L'Oreal good to use?",
+        "output": "L'Oreal is a popular brand with many positive reviews."
+    }
+]
+"""
 
 
 async def search():
     store = FaissStore(DATA_PATH / "example.json")
     role = Sales(profile="Sales", store=store)
-
-    queries = ["Which facial cleanser is good for oily skin?", "Is L'Oreal good to use?"]
+    role._watch({Action})
+    queries = [
+        Message("Which facial cleanser is good for oily skin?", cause_by=Action),
+        Message("Is L'Oreal good to use?", cause_by=Action),
+    ]
     for query in queries:
         logger.info(f"User: {query}")
         result = await role.run(query)
diff --git a/metagpt/actions/action.py b/metagpt/actions/action.py
index f8016b8a2a..dc96699a9f 100644
--- a/metagpt/actions/action.py
+++ b/metagpt/actions/action.py
@@ -9,7 +9,7 @@
 from abc import ABC
 from typing import Optional
 
-from tenacity import retry, stop_after_attempt, wait_fixed
+from tenacity import retry, stop_after_attempt, wait_random_exponential
 
 from metagpt.actions.action_output import ActionOutput
 from metagpt.llm import LLM
@@ -53,7 +53,7 @@ async def _aask(self, prompt: str, system_msgs: Optional[list[str]] = None) -> s
         system_msgs.append(self.prefix)
         return await self.llm.aask(prompt, system_msgs)
 
-    @retry(stop=stop_after_attempt(3), wait=wait_fixed(1))
+    @retry(wait=wait_random_exponential(min=1, max=60), stop=stop_after_attempt(6))
     async def _aask_v1(
         self,
         prompt: str,
diff --git a/metagpt/actions/summarize_code.py b/metagpt/actions/summarize_code.py
index d10cd6c553..413ac2a219 100644
--- a/metagpt/actions/summarize_code.py
+++ b/metagpt/actions/summarize_code.py
@@ -7,7 +7,7 @@
 """
 from pathlib import Path
 
-from tenacity import retry, stop_after_attempt, wait_fixed
+from tenacity import retry, stop_after_attempt, wait_random_exponential
 
 from metagpt.actions.action import Action
 from metagpt.config import CONFIG
@@ -92,7 +92,7 @@ class SummarizeCode(Action):
     def __init__(self, name="SummarizeCode", context=None, llm=None):
         super().__init__(name, context, llm)
 
-    @retry(stop=stop_after_attempt(2), wait=wait_fixed(1))
+    @retry(stop=stop_after_attempt(2), wait=wait_random_exponential(min=1, max=60))
     async def summarize_code(self, prompt):
         code_rsp = await self._aask(prompt)
         return code_rsp
diff --git a/metagpt/actions/write_code.py b/metagpt/actions/write_code.py
index 9b20843c7b..4c138a1246 100644
--- a/metagpt/actions/write_code.py
+++ b/metagpt/actions/write_code.py
@@ -15,7 +15,7 @@
         RunCodeResult to standardize and unify parameter passing between WriteCode, RunCode, and DebugError.
 """
 
-from tenacity import retry, stop_after_attempt, wait_fixed
+from tenacity import retry, stop_after_attempt, wait_random_exponential
 
 from metagpt.actions.action import Action
 from metagpt.config import CONFIG
@@ -81,7 +81,7 @@ class WriteCode(Action):
     def __init__(self, name="WriteCode", context=None, llm=None):
         super().__init__(name, context, llm)
 
-    @retry(stop=stop_after_attempt(2), wait=wait_fixed(1))
+    @retry(wait=wait_random_exponential(min=1, max=60), stop=stop_after_attempt(6))
     async def write_code(self, prompt) -> str:
         code_rsp = await self._aask(prompt)
         code = CodeParser.parse_code(block="", text=code_rsp)
diff --git a/metagpt/actions/write_code_review.py b/metagpt/actions/write_code_review.py
index f7c6845d20..e1acc714bb 100644
--- a/metagpt/actions/write_code_review.py
+++ b/metagpt/actions/write_code_review.py
@@ -8,7 +8,7 @@
         WriteCode object, rather than passing them in when calling the run function.
 """
 
-from tenacity import retry, stop_after_attempt, wait_fixed
+from tenacity import retry, stop_after_attempt
 
 from metagpt.actions.action import Action
 from metagpt.config import CONFIG
@@ -94,7 +94,7 @@ class WriteCodeReview(Action):
     def __init__(self, name="WriteCodeReview", context=None, llm=None):
         super().__init__(name, context, llm)
 
-    @retry(stop=stop_after_attempt(2), wait=wait_fixed(1))
+    @retry(stop=stop_after_attempt(2), wait=wait_random_exponential(min=1, max=60))
     async def write_code_review_and_rewrite(self, prompt):
         code_rsp = await self._aask(prompt)
         result = CodeParser.parse_block("Code Review Result", code_rsp)
diff --git a/metagpt/provider/openai_api.py b/metagpt/provider/openai_api.py
index 8ac0c4b21d..a73bb0aa0c 100644
--- a/metagpt/provider/openai_api.py
+++ b/metagpt/provider/openai_api.py
@@ -15,7 +15,7 @@
     retry,
     retry_if_exception_type,
     stop_after_attempt,
-    wait_fixed,
+    wait_random_exponential,
 )
 
 from metagpt.config import CONFIG
@@ -231,8 +231,8 @@ async def acompletion(self, messages: list[dict]) -> dict:
         return await self._achat_completion(messages)
 
     @retry(
-        stop=stop_after_attempt(3),
-        wait=wait_fixed(1),
+        wait=wait_random_exponential(min=1, max=60),
+        stop=stop_after_attempt(6),
         after=after_log(logger, logger.level("WARNING").name),
         retry=retry_if_exception_type(APIConnectionError),
         retry_error_callback=log_and_reraise,
diff --git a/metagpt/provider/zhipuai_api.py b/metagpt/provider/zhipuai_api.py
index edd9084e36..92119b764d 100644
--- a/metagpt/provider/zhipuai_api.py
+++ b/metagpt/provider/zhipuai_api.py
@@ -13,7 +13,7 @@
     retry,
     retry_if_exception_type,
     stop_after_attempt,
-    wait_fixed,
+    wait_random_exponential,
 )
 
 from metagpt.config import CONFIG
@@ -122,7 +122,7 @@ async def _achat_completion_stream(self, messages: list[dict]) -> str:
 
     @retry(
         stop=stop_after_attempt(3),
-        wait=wait_fixed(1),
+        wait=wait_random_exponential(min=1, max=60),
         after=after_log(logger, logger.level("WARNING").name),
         retry=retry_if_exception_type(ConnectionError),
         retry_error_callback=log_and_reraise,
diff --git a/metagpt/roles/__init__.py b/metagpt/roles/__init__.py
index 1768b786c0..f033a5dfa2 100644
--- a/metagpt/roles/__init__.py
+++ b/metagpt/roles/__init__.py
@@ -12,7 +12,7 @@
 from metagpt.roles.product_manager import ProductManager
 from metagpt.roles.engineer import Engineer
 from metagpt.roles.qa_engineer import QaEngineer
-from metagpt.roles.seacher import Searcher
+from metagpt.roles.searcher import Searcher
 from metagpt.roles.sales import Sales
 from metagpt.roles.customer_service import CustomerService
 
diff --git a/metagpt/roles/sales.py b/metagpt/roles/sales.py
index 18282a494d..d5aac18246 100644
--- a/metagpt/roles/sales.py
+++ b/metagpt/roles/sales.py
@@ -28,7 +28,7 @@ def __init__(
 
     def _set_store(self, store):
         if store:
-            action = SearchAndSummarize("", engine=SearchEngineType.CUSTOM_ENGINE, search_func=store.search)
+            action = SearchAndSummarize("", engine=SearchEngineType.CUSTOM_ENGINE, search_func=store.asearch)
         else:
             action = SearchAndSummarize()
         self._init_actions([action])
diff --git a/metagpt/roles/seacher.py b/metagpt/roles/searcher.py
similarity index 99%
rename from metagpt/roles/seacher.py
rename to metagpt/roles/searcher.py
index 587698d1d8..bee8d39869 100644
--- a/metagpt/roles/seacher.py
+++ b/metagpt/roles/searcher.py
@@ -3,7 +3,7 @@
 """
 @Time    : 2023/5/23 17:25
 @Author  : alexanderwu
-@File    : seacher.py
+@File    : searcher.py
 @Modified By: mashenquan, 2023-11-1. According to Chapter 2.2.1 and 2.2.2 of RFC 116, change the data type of
         the `cause_by` value in the `Message` to a string to support the new message distribution feature.
 """
diff --git a/metagpt/subscription.py b/metagpt/subscription.py
new file mode 100644
index 0000000000..0d2b308216
--- /dev/null
+++ b/metagpt/subscription.py
@@ -0,0 +1,101 @@
+import asyncio
+from typing import AsyncGenerator, Awaitable, Callable
+
+from pydantic import BaseModel, Field
+
+from metagpt.logs import logger
+from metagpt.roles import Role
+from metagpt.schema import Message
+
+
+class SubscriptionRunner(BaseModel):
+    """A simple wrapper to manage subscription tasks for different roles using asyncio.
+
+    Example:
+        >>> import asyncio
+        >>> from metagpt.subscription import SubscriptionRunner
+        >>> from metagpt.roles import Searcher
+        >>> from metagpt.schema import Message
+
+        >>> async def trigger():
+        ...     while True:
+        ...         yield Message("the latest news about OpenAI")
+        ...         await asyncio.sleep(3600 * 24)
+
+        >>> async def callback(msg: Message):
+        ...     print(msg.content)
+
+        >>> async def main():
+        ...     pb = SubscriptionRunner()
+        ...     await pb.subscribe(Searcher(), trigger(), callback)
+        ...     await pb.run()
+
+        >>> asyncio.run(main())
+    """
+
+    tasks: dict[Role, asyncio.Task] = Field(default_factory=dict)
+
+    class Config:
+        arbitrary_types_allowed = True
+
+    async def subscribe(
+        self,
+        role: Role,
+        trigger: AsyncGenerator[Message, None],
+        callback: Callable[
+            [
+                Message,
+            ],
+            Awaitable[None],
+        ],
+    ):
+        """Subscribes a role to a trigger and sets up a callback to be called with the role's response.
+
+        Args:
+            role: The role to subscribe.
+            trigger: An asynchronous generator that yields Messages to be processed by the role.
+            callback: An asynchronous function to be called with the response from the role.
+        """
+        loop = asyncio.get_running_loop()
+
+        async def _start_role():
+            async for msg in trigger:
+                resp = await role.run(msg)
+                await callback(resp)
+
+        self.tasks[role] = loop.create_task(_start_role(), name=f"Subscription-{role}")
+
+    async def unsubscribe(self, role: Role):
+        """Unsubscribes a role from its trigger and cancels the associated task.
+
+        Args:
+            role: The role to unsubscribe.
+        """
+        task = self.tasks.pop(role)
+        task.cancel()
+
+    async def run(self, raise_exception: bool = True):
+        """Runs all subscribed tasks and handles their completion or exception.
+
+        Args:
+            raise_exception: _description_. Defaults to True.
+
+        Raises:
+            task.exception: _description_
+        """
+        while True:
+            for role, task in self.tasks.items():
+                if task.done():
+                    if task.exception():
+                        if raise_exception:
+                            raise task.exception()
+                        logger.opt(exception=task.exception()).error(f"Task {task.get_name()} run error")
+                    else:
+                        logger.warning(
+                            f"Task {task.get_name()} has completed. "
+                            "If this is unexpected behavior, please check the trigger function."
+                        )
+                    self.tasks.pop(role)
+                    break
+            else:
+                await asyncio.sleep(1)
diff --git a/tests/conftest.py b/tests/conftest.py
index 8e4422700c..0cef6a4c93 100644
--- a/tests/conftest.py
+++ b/tests/conftest.py
@@ -73,6 +73,17 @@ async def handle_client(reader, writer):
     return "http://{}:{}".format(*server.sockets[0].getsockname())
 
 
+# see https://github.com/Delgan/loguru/issues/59#issuecomment-466591978
+@pytest.fixture
+def loguru_caplog(caplog):
+    class PropogateHandler(logging.Handler):
+        def emit(self, record):
+            logging.getLogger(record.name).handle(record)
+
+    logger.add(PropogateHandler(), format="{message}")
+    yield caplog
+
+
 # init & dispose git repo
 @pytest.fixture(scope="session", autouse=True)
 def setup_and_teardown_git_repo(request):
diff --git a/tests/metagpt/test_subscription.py b/tests/metagpt/test_subscription.py
new file mode 100644
index 0000000000..2e898424dd
--- /dev/null
+++ b/tests/metagpt/test_subscription.py
@@ -0,0 +1,102 @@
+import asyncio
+
+import pytest
+
+from metagpt.roles import Role
+from metagpt.schema import Message
+from metagpt.subscription import SubscriptionRunner
+
+
+@pytest.mark.asyncio
+async def test_subscription_run():
+    callback_done = 0
+
+    async def trigger():
+        while True:
+            yield Message("the latest news about OpenAI")
+            await asyncio.sleep(3600 * 24)
+
+    class MockRole(Role):
+        async def run(self, message=None):
+            return Message("")
+
+    async def callback(message):
+        nonlocal callback_done
+        callback_done += 1
+
+    runner = SubscriptionRunner()
+
+    roles = []
+    for _ in range(2):
+        role = MockRole()
+        roles.append(role)
+        await runner.subscribe(role, trigger(), callback)
+
+    task = asyncio.get_running_loop().create_task(runner.run())
+
+    for _ in range(10):
+        if callback_done == 2:
+            break
+        await asyncio.sleep(0)
+    else:
+        raise TimeoutError("callback not call")
+
+    role = roles[0]
+    assert role in runner.tasks
+    await runner.unsubscribe(roles[0])
+
+    for _ in range(10):
+        if role not in runner.tasks:
+            break
+        await asyncio.sleep(0)
+    else:
+        raise TimeoutError("callback not call")
+
+    task.cancel()
+    for i in runner.tasks.values():
+        i.cancel()
+
+
+@pytest.mark.asyncio
+async def test_subscription_run_error(loguru_caplog):
+    async def trigger1():
+        while True:
+            yield Message("the latest news about OpenAI")
+            await asyncio.sleep(3600 * 24)
+
+    async def trigger2():
+        yield Message("the latest news about OpenAI")
+
+    class MockRole1(Role):
+        async def run(self, message=None):
+            raise RuntimeError
+
+    class MockRole2(Role):
+        async def run(self, message=None):
+            return Message("")
+
+    async def callback(msg: Message):
+        print(msg)
+
+    runner = SubscriptionRunner()
+    await runner.subscribe(MockRole1(), trigger1(), callback)
+    with pytest.raises(RuntimeError):
+        await runner.run()
+
+    await runner.subscribe(MockRole2(), trigger2(), callback)
+    task = asyncio.get_running_loop().create_task(runner.run(False))
+
+    for _ in range(10):
+        if not runner.tasks:
+            break
+        await asyncio.sleep(0)
+    else:
+        raise TimeoutError("wait runner tasks empty timeout")
+
+    task.cancel()
+    for i in runner.tasks.values():
+        i.cancel()
+    assert len(loguru_caplog.records) >= 2
+    logs = "".join(loguru_caplog.messages)
+    assert "run error" in logs
+    assert "has completed" in logs