[BUG] Telegram plugin: inbound MCP notifications (notifications/claude/channel) not injected into conversation

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

• Claude Code: 2.1.89
• OS: Linux
• Plugin: telegram@claude-plugins-official (official marketplace)
• MCP SDK: @modelcontextprotocol/sdk 1.27.1

## Problem
Inbound Telegram messages are never injected into the Claude Code conversation as <channel source="telegram"> tags, even though the MCP
connection is established and notifications are being sent.

## Diagnosis

• Bot process (PID bun/server.ts) is running and connected to Claude Code via Unix socket pair
• ss -p confirms: claude process (fd 45) is connected to the bot's stdout (fd 1/13)
• strace confirms: when an allowed user DMs the bot, the MCP notification IS sent:

write(13, "{\"method\":\"notifications/claude/channel\"...", 214) = 214

• The outbound direction works: using the reply tool successfully sends messages to Telegram
• Allowlist is configured correctly (user ID in allowFrom, dmPolicy: allowlist)

## Expected behavior
Telegram messages from allowed users should appear as <channel source="telegram" ...> in the conversation context.

## Actual behavior
Nothing appears. The notification is sent by the MCP server but never injected into the conversation by Claude Code.

What Should Happen?

Telegram messages from allowed users should appear as <channel source="telegram" ...> in the conversation context.

Error Messages/Logs

Steps to Reproduce

1. Install the Telegram plugin from the official Claude Code marketplace
2. Configure bot token: /telegram:configure <token>
3. Add your Telegram user ID to the allowlist in ~/.claude/channels/telegram/access.json
4. Send a DM to the bot from the allowed Telegram account
5. Observe that no <channel source="telegram"> tag appears in the Claude Code conversation

Verification (confirms the issue is on Claude Code side, not the plugin):

• strace on the bot process shows the notification IS sent: write(13, "{\"method\":\"notifications/claude/channel\"...", 214)
• ss -p confirms Claude Code process is connected to the bot via Unix socket
• The reply tool works correctly (outbound direction functional)

Claude Model

Sonnet (default)

Is this a regression?

I don't know

Last Working Version

_No response_

Claude Code Version

2.1.89

Platform

Anthropic API

Operating System

Ubuntu/Debian Linux

Terminal/Shell

Terminal.app (macOS)

Additional Information

_No response_