Telegram MCP plugin: channel notifications not surfaced in conversation

Description

The Telegram MCP plugin (plugin:telegram) sends notifications/claude/channel via the MCP stdio transport, but Claude Code does not surface these notifications in the conversation. This means the bot can send messages to Telegram (via the reply tool) but cannot receive incoming user messages.

Evidence

Using strace on the bun process running the Telegram MCP server, I confirmed that:

1. The bot receives Telegram messages via long polling (grammy bot.start()) ✅
2. The access gate passes the message (user is in allowFrom) ✅
3. mcp.notification() writes the JSON-RPC notification to stdout (fd 1 → Unix socket connected to Claude Code) ✅
4. The write succeeds (208 bytes written, no error) ✅

Example captured notification:

{"method":"notifications/claude/channel","params":{"content":"1","meta":{"chat_id":"7747504063","message_id":"26","user":"7747504063","user_id":"7747504063","ts":"2026-03-20T12:56:27.000Z"}},"jsonrpc":"2.0"}

The Unix socket between the MCP server and Claude Code is established and healthy:

• stdin: socket connected to Claude (pid's fd 27)
• stdout: socket connected to Claude (pid's fd 32)

Expected behavior

Incoming Telegram messages should appear in the Claude Code conversation as <channel source="telegram" ...> blocks, as described in the MCP server's instructions.

Actual behavior

Nothing appears. The notification is written to the socket but Claude Code does not display or process it.

Environment

• Claude Code version: 2.1.80
• OS: Linux (RHEL 8, kernel 4.18.0-553.111.1.el8_10.x86_64)
• Telegram plugin: claude-plugins-official/telegram v0.0.1
• MCP transport: stdio (bun → Unix socket → claude)
• The plugin is enabled in settings.json under enabledPlugins

Steps to reproduce

1. Install and configure the Telegram plugin (/telegram:configure)
2. Pair a Telegram user (/telegram:access)
3. Send a message from Claude Code to Telegram via the reply tool → works
4. Send a message from Telegram to the bot → nothing appears in Claude Code

Workaround

None currently. The bot can only be used for one-way outbound messaging.