diff --git a/README.md b/README.md
index b3473a12c..b0faf85c7 100644
--- a/README.md
+++ b/README.md
@@ -33,7 +33,8 @@ # MetaGPT: The Multi-Agent Framework
 
 <p align="center">Software Company Multi-Role Schematic (Gradually Implementing)</p>
 
-
+## News
+- Dec 15: v0.5.0 is released! We introduce **incremental development**, facilitating agents to build up larger projects on top of their previous efforts or exisiting human codebase. We also launch a whole collection of important features, including multilingual support (experimental), multiple programming languages support (experimental), incremental development (experimental), CLI support, pip support, enhanced code review, documentation mechanism, and optimized messaging mechanism!
 
 ## Install
 
diff --git a/config/config.yaml b/config/config.yaml
index 496167e13..d38240ae6 100644
--- a/config/config.yaml
+++ b/config/config.yaml
@@ -1,6 +1,9 @@
 # DO NOT MODIFY THIS FILE, create a new key.yaml, define OPENAI_API_KEY.
 # The configuration of key.yaml has a higher priority and will not enter git
 
+#### Project Path Setting
+# WORKSPACE_PATH: "Path for placing output files"
+
 #### if OpenAI
 ## The official OPENAI_API_BASE is https://api.openai.com/v1
 ## If the official OPENAI_API_BASE is not available, we recommend using the [openai-forward](https://github.com/beidongjiedeguang/openai-forward).
diff --git a/metagpt/actions/role_run.py b/metagpt/actions/role_run.py
new file mode 100644
index 000000000..9f0c626b8
--- /dev/null
+++ b/metagpt/actions/role_run.py
@@ -0,0 +1,16 @@
+#!/usr/bin/env python
+# -*- coding: utf-8 -*-
+"""
+@Time    : 2023/12/18
+@Author  : mashenquan
+@File    : role_run.py
+@Desc    : Message type caused by `Role.run()` invocation.
+"""
+from metagpt.actions import Action
+
+
+class RoleRun(Action):
+    """Message type caused by `Role.run` invocation"""
+
+    async def run(self, *args, **kwargs):
+        raise NotImplementedError
diff --git a/metagpt/const.py b/metagpt/const.py
index 03f3d8fe3..fcb3a2b3e 100644
--- a/metagpt/const.py
+++ b/metagpt/const.py
@@ -17,12 +17,18 @@ from loguru import logger
 
 import metagpt
 
-OPTIONS = contextvars.ContextVar("OPTIONS")
+OPTIONS = contextvars.ContextVar("OPTIONS", default={})
 
 
 def get_metagpt_package_root():
     """Get the root directory of the installed package."""
     package_root = Path(metagpt.__file__).parent.parent
+    for i in (".git", ".project_root", ".gitignore"):
+        if (package_root / i).exists():
+            break
+    else:
+        package_root = Path.cwd()
+
     logger.info(f"Package root set to {str(package_root)}")
     return package_root
 
diff --git a/metagpt/roles/role.py b/metagpt/roles/role.py
index 06c00a670..ad5ee89c0 100644
--- a/metagpt/roles/role.py
+++ b/metagpt/roles/role.py
@@ -28,6 +28,7 @@ from pydantic import BaseModel, Field
 
 from metagpt.actions import Action, ActionOutput
 from metagpt.actions.action_node import ActionNode
+from metagpt.actions.role_run import RoleRun
 from metagpt.llm import LLM, HumanProvider
 from metagpt.logs import logger
 from metagpt.memory import Memory
@@ -317,7 +318,9 @@ class Role:
         old_messages = [] if ignore_memory else self._rc.memory.get()
         self._rc.memory.add_batch(news)
         # Filter out messages of interest.
-        self._rc.news = [n for n in news if n.cause_by in self._rc.watch and n not in old_messages]
+        watch = self._rc.watch or set()
+        watch.add(any_to_str(RoleRun))
+        self._rc.news = [n for n in news if n.cause_by in watch and n not in old_messages]
 
         # Design Rules:
         # If you need to further categorize Message objects, you can do so using the Message.set_meta function.
@@ -397,6 +400,8 @@ class Role:
                 msg = with_message
             elif isinstance(with_message, list):
                 msg = Message("\n".join(with_message))
+            if not msg.cause_by:
+                msg.cause_by = RoleRun
             self.put_message(msg)
 
         if not await self._observe():
diff --git a/metagpt/team.py b/metagpt/team.py
index ed406ee4c..d613a04ef 100644
--- a/metagpt/team.py
+++ b/metagpt/team.py
@@ -3,10 +3,12 @@
 """
 @Time    : 2023/5/12 00:30
 @Author  : alexanderwu
-@File    : software_company.py
+@File    : team.py
 @Modified By: mashenquan, 2023/11/27. Add an archiving operation after completing the project, as specified in
         Section 2.2.3.3 of RFC 135.
 """
+import warnings
+
 from pydantic import BaseModel, Field
 
 from metagpt.actions import UserRequirement
@@ -50,7 +52,7 @@ class Team(BaseModel):
             )
 
     def run_project(self, idea, send_to: str = ""):
-        """Start a project from publishing user requirement."""
+        """Run a project from publishing user requirement."""
         self.idea = idea
 
         # Human requirement.
@@ -59,6 +61,19 @@ class Team(BaseModel):
             peekable=False,
         )
 
+    def start_project(self, idea, send_to: str = ""):
+        """
+        Deprecated: This method will be removed in the future.
+        Please use the `run_project` method instead.
+        """
+        warnings.warn(
+            "The 'start_project' method is deprecated and will be removed in the future. "
+            "Please use the 'run_project' method instead.",
+            DeprecationWarning,
+            stacklevel=2,
+        )
+        return self.run_project(idea=idea, send_to=send_to)
+
     def _save(self):
         logger.info(self.json(ensure_ascii=False))
 
diff --git a/setup.py b/setup.py
index 4dd453b3d..73a05eeae 100644
--- a/setup.py
+++ b/setup.py
@@ -30,7 +30,7 @@ with open(path.join(here, "requirements.txt"), encoding="utf-8") as f:
 
 setup(
     name="metagpt",
-    version="0.4.0",
+    version="0.5.1",
     description="The Multi-Role Meta Programming Framework",
     long_description=long_description,
     long_description_content_type="text/markdown",