Matrix Skill — Development skill for Claude Code

Matrix Skill

An Agentic Skill for Matrix chat communication, distributed as a Claude Code plugin.

Overview

This skill enables AI coding agents to send messages to Matrix chat rooms on behalf of users. Messages are sent using the user's own access token, so they appear as coming from the user. Works with any Matrix homeserver.

**What is an Agentic Skill?** Platform-agnostic instructions and tools that AI coding agents can use. This skill is packaged as a Claude Code plugin but follows the open [Agentic Skills specification](https://github.com/anthropics/agentic-skills).

Features

• Send messages to any joined Matrix room
• Rich formatting - bold, italic, code, strikethrough, spoilers, lists, blockquotes
• Smart link shortening - Jira, GitHub, GitLab URLs become readable links
• Matrix mentions - @user:server becomes clickable user pill
• Room links - #room:server becomes clickable room link
• Code blocks - Syntax-highlighted multi-line code
• Emotes - /me style action messages (--emote)
• Thread replies - Keep discussions organized (--thread)
• Reactions - Add emoji reactions to messages (✅ 👍 🚀)
• Edit messages - Modify sent messages
• Redact messages - Delete messages from rooms
• Visual effects - Confetti 🎉, fireworks 🎆, snowfall ❄️ (Element clients)
• List rooms to find the right destination
• Read messages - both unencrypted and E2EE decryption
• Bot prefix - optional 🤖 prefix for automated messages
• Device verification - SAS emoji verification for E2EE

Installation

Marketplace (Recommended)

Add the [Netresearch marketplace](https://github.com/netresearch/claude-code-marketplace) once, then browse and install skills:

# Claude Code
/plugin marketplace add netresearch/claude-code-marketplace

npx ([skills.sh](https://skills.sh))

Install with any [Agent Skills](https://agentskills.io)-compatible agent:

...