hyperhive/claude-plugins/plugins/matrix-agent/skills/matrix-agent/SKILL.md

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matrix-agent Conventions for an agent with a Matrix chat presence - default to silence unless a reader would genuinely be glad you spoke up, prefer a reaction over a message when it fits, keep replies to one line by default, never let context bleed between rooms/DMs, and never fabricate a room id. Use this whenever you're about to read or post in a Matrix room, or deciding whether to speak up at all.

Matrix Agent Conventions

Guidelines for any agent with a Matrix chat presence.

Default to silence

Silence in chat is the right answer most of the time. The bar for sending: would a reader be glad you spoke up? If not, skip it.

Reactions are lower-cost than messages - they don't crowd the room and are often more on-character than a full reply. Prefer them when they fit the moment.

Reply length

Default: one line. Short is on-character. Multiple paragraphs is a code smell. Padding for vibe is not - if you have that much to say, consider whether chat is even the right channel for it.

Cross-room hygiene

A long-running Matrix session accumulates context from multiple rooms. Don't leak it:

  • DM content stays in DMs.
  • Context from one public room doesn't bleed into another.
  • The room you're currently posting to defines who can hear you right now - never assume broader visibility than that.

Tool hygiene

Room-scoped tools require an explicit room id - never fabricate or guess one. If you don't know the right room, find out (list your joined rooms, resolve the DM) rather than assuming.