diff --git a/metagpt/logs.py b/metagpt/logs.py
index c46041af8..f102c1be3 100644
--- a/metagpt/logs.py
+++ b/metagpt/logs.py
@@ -8,11 +8,9 @@
 
 from __future__ import annotations
 
-import json
 import sys
 from datetime import datetime
 from functools import partial
-from typing import List
 
 from loguru import logger as _logger
 from pydantic import BaseModel, Field
@@ -20,12 +18,17 @@ from pydantic import BaseModel, Field
 from metagpt.const import METAGPT_ROOT
 
 
-class ToolOutputItem(BaseModel):
+class ToolLogItem(BaseModel):
     type_: str = Field(alias="type", default="str", description="Data type of `value` field.")
     name: str
     value: str
 
 
+TOOL_LOG_END_MARKER = ToolLogItem(
+    type="str", name="end_marker", value="#END#"
+)  # A special log item to suggest the end of a stream log
+
+
 def define_log_level(print_level="INFO", logfile_level="DEBUG", name: str = None):
     """Adjust the log level to above level"""
     current_date = datetime.now()
@@ -45,13 +48,9 @@ def log_llm_stream(msg):
     _llm_stream_log(msg)
 
 
-def log_tool_output(output: ToolOutputItem | List[ToolOutputItem], tool_name: str = ""):
+def log_tool_output(output: ToolLogItem | list[ToolLogItem], tool_name: str = ""):
     """interface for logging tool output, can be set to log tool output in different ways to different places with set_tool_output_logfunc"""
-    if not _tool_output_log or not output:
-        return
-
-    outputs = output if isinstance(output, list) else [output]
-    _tool_output_log(output=json.dumps([i.model_dump() for i in outputs]), tool_name=tool_name)
+    _tool_output_log(output=output, tool_name=tool_name)
 
 
 def set_llm_stream_logfunc(func):
@@ -67,8 +66,4 @@ def set_tool_output_logfunc(func):
 _llm_stream_log = partial(print, end="")
 
 
-def _default_tool_output_log(*args, **kwargs):
-    print(*args, str(kwargs), end="")
-
-
-_tool_output_log = _default_tool_output_log
+_tool_output_log = lambda output, tool_name: print(output)
diff --git a/metagpt/schema.py b/metagpt/schema.py
index da9f55166..7bf924b97 100644
--- a/metagpt/schema.py
+++ b/metagpt/schema.py
@@ -46,6 +46,7 @@ from metagpt.const import (
     SYSTEM_DESIGN_FILE_REPO,
     TASK_FILE_REPO,
 )
+from metagpt.logs import ToolLogItem, log_tool_output, logger
 from metagpt.repo_parser import DotClassInfo
 from metagpt.utils.common import any_to_str, any_to_str_set, import_class
 from metagpt.utils.exceptions import handle_exception
@@ -433,10 +434,8 @@ class Plan(BaseModel):
             final_tasks = self.tasks[:prefix_length] + new_tasks[prefix_length:]
             self.tasks = final_tasks
 
-        from metagpt.logs import ToolOutputItem, log_tool_output
-
         log_tool_output(
-            ToolOutputItem(
+            ToolLogItem(
                 name="output", value="\n\n".join([f"Task {task.task_id}: {task.instruction}" for task in self.tasks])
             ),
             tool_name="Plan",
diff --git a/metagpt/tools/libs/software_development.py b/metagpt/tools/libs/software_development.py
index ab7806006..a75625702 100644
--- a/metagpt/tools/libs/software_development.py
+++ b/metagpt/tools/libs/software_development.py
@@ -6,7 +6,7 @@ from pathlib import Path
 from typing import Optional
 
 from metagpt.const import BUGFIX_FILENAME, REQUIREMENT_FILENAME
-from metagpt.logs import ToolOutputItem, log_tool_output
+from metagpt.logs import log_tool_output
 from metagpt.schema import BugFixContext, Message
 from metagpt.tools.tool_registry import register_tool
 from metagpt.utils.common import any_to_str
diff --git a/metagpt/tools/libs/terminal.py b/metagpt/tools/libs/terminal.py
index 2b1657bdd..a23ebb86a 100644
--- a/metagpt/tools/libs/terminal.py
+++ b/metagpt/tools/libs/terminal.py
@@ -1,6 +1,6 @@
 import subprocess
 
-from metagpt.logs import log_tool_output
+from metagpt.logs import TOOL_LOG_END_MARKER, ToolLogItem, log_tool_output
 from metagpt.tools.tool_registry import register_tool
 
 
@@ -11,7 +11,6 @@ class Terminal:
     def __init__(self):
         self.shell_command = ["bash"]  # FIXME: should consider windows support later
         self.command_terminator = "\n"
-        self.end_marker = "#END_MARKER#"
 
         # Start a persistent shell process
         self.process = subprocess.Popen(
@@ -40,17 +39,22 @@ class Terminal:
         # Send the command
         self.process.stdin.write(cmd + self.command_terminator)
         self.process.stdin.write(
-            f'echo "{self.end_marker}"' + self.command_terminator
+            f'echo "{TOOL_LOG_END_MARKER.value}"' + self.command_terminator
         )  # Unique marker to signal command end
         self.process.stdin.flush()
-        log_tool_output(output={"cmd": cmd + self.command_terminator}, tool_name="Terminal")  # log the command
+        log_tool_output(
+            output=ToolLogItem(name="cmd", value=cmd + self.command_terminator), tool_name="Terminal"
+        )  # log the command
 
         # Read the output until the unique marker is found
         while True:
             line = self.process.stdout.readline()
-            if line.strip() == self.end_marker:
+            if line.strip() == TOOL_LOG_END_MARKER.value:
+                log_tool_output(TOOL_LOG_END_MARKER)
                 break
-            log_tool_output(output={"output": line}, tool_name="Terminal")  # log stdout in real-time
+            log_tool_output(
+                output=ToolLogItem(name="output", value=line), tool_name="Terminal"
+            )  # log stdout in real-time
             cmd_output.append(line)
 
         return "".join(cmd_output)