[BUG] Hook failed to pass input,

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?

I use Notification hook completes the notification function, however when I use the sh script as an entry to pass the hook input in, it never succeeds, I tried the pipeline, stdin, script parameters, they all read as empty, even though I read them correctly in the sh script

What Should Happen?

Correct reading

Error Messages/Logs

2026-01-17T08:52:15.896Z [DEBUG] Notification:permission_prompt [$CLAUDE_PROJECT_DIR/.claude/hooks/notify.sh] completed with status 1
2026-01-17T08:52:15.896Z [DEBUG] Hook output does not start with {, treating as plain text

Steps to Reproduce

#!/bin/bash

set -e

# 从 stdin 一次性读取所有输入，并存入变量
#payload=$(cat)

# 切换到 hooks 目录
cd "$CLAUDE_PROJECT_DIR/.claude/hooks"

#echo "$payload" >> console.log

# 将读取的内容重新作为 参数 传给 notify.ts
cat | npx tsx notify.ts   >> notify.log 2>&1

import TelegramBot from 'node-telegram-bot-api';
import { HttpsProxyAgent } from 'https-proxy-agent';
import { readFileSync } from 'fs';

const token = 'xxxxx';
const agent = new HttpsProxyAgent('http://127.0.0.1:10808');

interface HookInput {
  session_id: string;
  transcript_path: string;
  cwd: string;
  message: string;
  hook_event_name: string;
  notification_type: string;
}

const bot = new TelegramBot(token, {
  polling: false,
  request: {
    agent,
  },
});

async function readStdin(): Promise<string> {
  return new Promise((resolve, reject) => {
    let data = '';
    process.stdin
      .setEncoding('utf8')
      .on('data', (chunk) => {
        data += chunk;
      })
      .on('end', () => {
        resolve(data);
      })
      .on('error', (err) => {
        reject(err);
      });

    // 防止卡住
    setTimeout(() => {
      reject(new Error('Stdin read timeout'));
    }, 5000);
  });
}

async function main() {
  try {
    // 👇 使用异步安全读取
    const input = await readStdin();

    console.error('📥 Raw stdin:', JSON.stringify(input)); // 调试用

    if (!input.trim()) {
      throw new Error('No input received via stdin');
    }

    let data: HookInput;
    try {
      data = JSON.parse(input);
    } catch (err) {
      throw new Error(`Failed to parse JSON: ${err instanceof Error ? err.message : String(err)}\nReceived: ${input}`);
    }

    const message = `🔔 Claude 

${data.hook_event_name}

${data.message}

${data.cwd}

🔄 Session ID:
${data.session_id}
`;

    await bot.sendMessage(6550266873, message);

    console.log('✅ success');
    process.exit(0);
  } catch (err: any) {
    console.error('❌ error:', err?.message || err);
    process.exit(1);
  }
}

main();

Claude Model

Other

Is this a regression?

I don't know

Last Working Version

_No response_

Claude Code Version

2.1.11 (Claude Code)

Platform

Other

Operating System

Windows

Terminal/Shell

WSL (Windows Subsystem for Linux)

Additional Information

_No response_