Problem

The message tool (used by agents to send proactive messages) cannot route to plugin-registered channels. Specifically, telegram-userbot is registered via api.registerChannel() and appears in listPluginChannelIds(), but the message tool rejects sends with:

Unknown target "-1003812100686" for Telegram Userbot.

Expected Behavior

Plugin channels registered via api.registerChannel() should be discoverable by the message tool for proactive sends (not just in-session replies), including:

• action=send with text
• action=send with file attachments (filePath)

Current Behavior

• In-session reply delivery works perfectly (via dispatchReplyWithBufferedBlockDispatcher → deliver callback)
• The message tool's action=send with channel=telegram-userbot fails
• The error comes from resolveOutboundTarget — the plugin's outbound.resolveTarget is never called

Context

The telegram-userbot plugin (openclaw-channel-telegram-userbot) uses GramJS to connect as a regular Telegram user account. It registers with api.registerChannel({ plugin }) and has full outbound.sendText and outbound.sendMedia adapters. These work for reply delivery but not for proactive message tool sends.

Steps to Reproduce

1. Install and configure the telegram-userbot plugin
2. From an agent session, use the message tool:

   message(action='send', channel='telegram-userbot', target='-1003812100686', message='test')
   

3. Result: Unknown target error

Environment

• OpenClaw version: latest (March 2026)
• Plugin: openclaw-channel-telegram-userbot
• OS: macOS (Apple Silicon)