[BUG] 2.1. 88 --channels: "Input must be provided either through stdin or as a prompt argument when using --print"

Preflight Checklist

• [x] I have searched existing issues and this hasn't been reported yet
• [x] This is a single bug report (please file separate reports for different bugs)
• [x] I am using the latest version of Claude Code

What's Wrong?

Telegram channel notifications reach the MCP server correctly, but Claude Code fails to process them with this error since
~v2.1.87. and 2.1 .88

What Should Happen?

After upgrading to the latest version of Claude Code, the Telegram plugin is no longer working. Claude Code can receive my Telegram messages in the background, but it cannot reply to me.

Error Messages/Logs

After upgrading to the latest version of Claude Code, the Telegram plugin is no longer working. Claude Code can receive my Telegram messages in the background, but it cannot reply to me.

Steps to Reproduce

After upgrading to the latest version of Claude Code, the Telegram plugin is no longer working. Claude Code can receive my Telegram messages in the background, but it cannot reply to me.

Claude Model

None

Is this a regression?

Yes, this worked in a previous version

Last Working Version

_No response_

Claude Code Version

2.1.87 2.1.88

Platform

Anthropic API

Operating System

macOS

Terminal/Shell

Terminal.app (macOS)

Additional Information

_No response_