Feature Description

Discord currently supports mention-gating globally (discord.require_mention) and channel-level free-response exemptions (discord.free_response_channels). It would be useful to also support guild-level free-response exemptions, so a bot can respond to every message in specific low-noise/private guilds while still requiring @mentions in all other guilds.

Motivation

Some users run Hermes in multiple Discord guilds:

• Personal/private guilds where Hermes is the only or primary participant and should behave like a resident assistant.
• Shared/team/community guilds where Hermes should stay quiet unless explicitly @mentioned.

Today, users must either:

1. Disable discord.require_mention globally, which is too noisy/risky across all guilds.
2. Maintain every channel ID in discord.free_response_channels, which is brittle when channels/threads are added.

Proposed Solution

Add a new Discord config key:

discord:
  require_mention: true
  free_response_guilds:
    - "1476256146980606197"

Behavior:

• If discord.require_mention is true and the incoming message's guild ID is listed in discord.free_response_guilds, skip the @mention requirement.
• Other guilds keep the existing mention-gated behavior.
• Existing discord.free_response_channels, DMs, thread participation, ignored channels, and allowed channels behavior remains unchanged.

Alternatives Considered

• Use discord.free_response_channels for every channel in a guild. This works but requires ongoing manual maintenance and misses new channels.
• Set discord.require_mention: false globally. This is too broad when the bot is installed in multiple guilds.