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fix: redirect stdio banner to stderr to prevent MCP protocol pollution #1209

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fix: redirect stdio banner to stderr to prevent MCP protocol pollution #1209

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9 changes: 8 additions & 1 deletion mcp_server/server.py
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Original file line number Diff line number Diff line change
Expand Up @@ -1132,7 +1132,12 @@ def run_server(
# 初始化工具实例
_get_tools(project_root)

# 打印启动信息
# 打印启动信息（stdio 模式下 stdout 是 JSON-RPC 通道，banner 必须走 stderr）
import sys
_banner_stdout = sys.stdout
if transport == 'stdio':
sys.stdout = sys.stderr

print()
print("=" * 60)
print(" TrendRadar MCP Server - FastMCP 2.0")
Expand Down Expand Up @@ -1199,6 +1204,8 @@ def run_server(
print(" 26. send_notification - 向通知渠道发送消息（自动适配格式）")
print("=" * 60)
print()

sys.stdout = _banner_stdout

# 根据传输模式运行服务器
if transport == 'stdio':
Expand Down