[BUG] [Windows 11] Pasting >25 lines into CLI input is truncated intermittently

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?

Environment

• OS: Windows 11
• Claude Code version: (2.1.104)
• Terminal: (填你用的终端，如 Windows Terminal / CMD / PowerShell)

Bug Description

When pasting text longer than approximately 25 lines into the Claude Code CLI prompt, the content is truncated — Claude only receives a partial message.

The issue is intermittent: the same content, same terminal, same input method sometimes works and sometimes fails.

Steps to Reproduce

1. Open Claude Code CLI in any terminal on Windows 11
2. Paste a block of text that is 25+ lines long
3. Submit the message
4. Observe that Claude's response indicates it only received partial content

Expected Behavior

Full pasted content is received and processed by Claude.

Actual Behavior

Content is truncated. Claude receives only part of the pasted text (appears to cut off around 25 lines).

Additional Context

• Other AI CLI tools (e.g., Codex) in the same terminal with the same input method handle the same content without truncation
• The issue is not consistent — identical input sometimes passes, sometimes fails
• Workaround: writing content to a file and using the Read tool

What Should Happen?

Pasting any length of text into the Claude Code CLI prompt should be received in full by the model, consistent with the behavior of other AI CLI tools running in the same terminal environment.

Error Messages/Logs

Steps to Reproduce

1. Open any terminal on Windows 11 (e.g., Windows Terminal)
2. Start Claude Code CLI
3. Paste 25+ lines of text into the input prompt
4. Submit

Actual Result: Claude only receives partial content — truncated around 25 lines

Expected Result: Claude receives the full pasted text

Claude Model

None

Is this a regression?

Yes, this worked in a previous version

Last Working Version

_No response_

Claude Code Version

2.1.104

Platform

Anthropic API

Operating System

Windows

Terminal/Shell

Terminal.app (macOS)

Additional Information

_No response_