discord.py does not apply a default AllowedMentions to the client, so any
reply whose content contains @everyone/@here or a role mention would ping
the whole server — including verbatim echoes of user input or LLM output
that happens to contain those tokens.
Set a safe default on commands.Bot: everyone=False, roles=False,
users=True, replied_user=True. Operators can opt back in via four
DISCORD_ALLOW_MENTION_* env vars or discord.allow_mentions.* in
config.yaml. No behavior change for normal user/reply pings.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
