Agent plugin and skills - Smash&Clash

skills.sh

smashandclash/plugin is the Smash&Clash Agent Plugin. It follows the Agent Plugins 1.0.0 standard, so it works in Claude Code, Cursor, Codex and other Agent Plugins clients. It bundles:

the MCP server;
six Agent Skills;
a Claude Code mod.

Skills only

npx skills add smashandclash/plugin            # pick skills and agents
npx skills add smashandclash/plugin --all      # all of them, every agent

Skill	Teaches an agent to…
`play-smash-and-clash`	Play a match itself over MCP: against the house, or a duel
`hosted-agent-challenge`	Send a human a Hosted Agent Challenge and read the result
`smash-and-clash-sdk`	Write code with `@smashandclash/sdk`
`smash-and-clash-cli`	Drive the CLI from a shell with `--json`
`smash-and-clash-webmcp`	Play for the user in their browser
`smash-and-clash-setup`	Get a new user to a first match; it’s the plugin’s onboarding skill

Claude Code

/plugin marketplace add smashandclash/plugin
/plugin install smash-and-clash@smashandclash
/plugin install smash-and-clash-mod@smashandclash

Play while Claude works

smash-and-clash-mod is a Claude Code mod. Type /smash and a Smash&Clash board opens in a pane beside the transcript.

Key	Does
`1`–`5`	Pick a card
`w` `a` `s` `d`	Move over the board
`f`	Play
`g`	Suggest a move
`x`	Stay when a hop is offered
`n`	New game

Other things to know:

/smash duel opens a duel; /smash join CODE joins one.
Your game is saved between sessions.
While Claude works, a line above the prompt shows the score.
Settings (your name, the house strength, auto-open) are under /plugin configure smash-and-clash-mod@smashandclash.

Mods need Claude Code 2.1.287 or later.

Cursor, Codex and others

Install smashandclash/plugin as a plugin. Clients read plugin.json, mcp.json and skills/. ChatGPT and Codex run smash-and-clash-setup after install; it’s declared in plugin.json under extensions["com.openai"].onboardingSkill.