diff --git a/metagpt/const.py b/metagpt/const.py
index 9e7462da6..e792ff35a 100644
--- a/metagpt/const.py
+++ b/metagpt/const.py
@@ -14,9 +14,11 @@ def get_project_root():
     """逐级向上寻找项目根目录"""
     current_path = Path.cwd()
     while True:
-        if (current_path / '.git').exists() or \
-           (current_path / '.project_root').exists() or \
-           (current_path / '.gitignore').exists():
+        if (
+            (current_path / ".git").exists()
+            or (current_path / ".project_root").exists()
+            or (current_path / ".gitignore").exists()
+        ):
             return current_path
         parent_path = current_path.parent
         if parent_path == current_path:
@@ -25,15 +27,15 @@ def get_project_root():
 
 
 PROJECT_ROOT = get_project_root()
-DATA_PATH = PROJECT_ROOT / 'data'
-WORKSPACE_ROOT = PROJECT_ROOT / 'workspace'
-PROMPT_PATH = PROJECT_ROOT / 'metagpt/prompts'
-UT_PATH = PROJECT_ROOT / 'data/ut'
+DATA_PATH = PROJECT_ROOT / "data"
+WORKSPACE_ROOT = PROJECT_ROOT / "workspace"
+PROMPT_PATH = PROJECT_ROOT / "metagpt/prompts"
+UT_PATH = PROJECT_ROOT / "data/ut"
 SWAGGER_PATH = UT_PATH / "files/api/"
 UT_PY_PATH = UT_PATH / "files/ut/"
 API_QUESTIONS_PATH = UT_PATH / "files/question/"
 YAPI_URL = "http://yapi.deepwisdomai.com/"
-TMP = PROJECT_ROOT / 'tmp'
+TMP = PROJECT_ROOT / "tmp"
 RESEARCH_PATH = DATA_PATH / "research"
 
 MEM_TTL = 24 * 30 * 3600
@@ -43,4 +45,12 @@ DEFAULT_LANGUAGE = "English"
 DEFAULT_MAX_TOKENS = 1500
 COMMAND_TOKENS = 500
 BRAIN_MEMORY = "BRAIN_MEMORY"
-SKILL_PATH = "SKILL_PATH"
\ No newline at end of file
+SKILL_PATH = "SKILL_PATH"
+SERPER_API_KEY = "SERPER_API_KEY"
+
+# MetaGPT LLM key defines
+METAGPT_API_MODEL = "METAGPT_API_MODEL"
+METAGPT_API_KEY = "METAGPT_API_KEY"
+METAGPT_API_BASE = "METAGPT_API_BASE"
+METAGPT_API_TYPE = "METAGPT_API_TYPE"
+METAGPT_API_VERSION = "METAGPT_API_VERSION"