Discord threads use their own channel IDs, so allowChannels was blocking
thread replies unless each thread ID was listed explicitly.
- Include the thread parent channel ID as an allowlist candidate
- Enforce allow_channels on slash commands (previously bypassed)
- Show parent channel ID in runtime context, reply to the thread
- Fix subagent cancel key via effective_key propagation
- Detect bot mentions via raw_mentions and reply-to-bot references
- Cache seen thread channels for outbound delivery
- Ignore system messages that become empty prompts
Add `allow_channels` config option to DiscordConfig that restricts
bot responses to specific Discord channels. When the list is empty
(default), the bot responds in all channels (backward compatible).
- Add `allow_channels: list[str]` field to DiscordConfig schema
- Add channel ID check in _handle_message_create after user filtering
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
Bongjin Lee
