Agent plugins

Skills and plugins for coding agents. One marketplace serves Claude Code, Codex and OpenCode.

Plugin	Skills	What it does
herdr-extensions	herdr-new-task	Starts a Herdr tab with an agent already primed on a task. Reads Linear or GitHub tickets, chat threads or a plain description.
summarizer	clickbait-announce, genz-announce, brainrot-announce, british-slang-announce	Turns shipped work into a Slack announcement in clickbait, Gen Z slang, meme brainrot or British slang style, built only from real commits, tickets and links.

Install

Claude Code

claude plugin marketplace add Geekfish/agent-plugins
claude plugin install herdr-extensions@geekfish
claude plugin install summarizer@geekfish

Codex

codex plugin marketplace add Geekfish/agent-plugins
codex plugin add herdr-extensions@geekfish
codex plugin add summarizer@geekfish

OpenCode

OpenCode reads the catalog in .opencode/marketplace.json through a separate plugin manager. It needs its own install process.

Layout

.claude-plugin/marketplace.json   Claude Code catalog
.agents/plugins/marketplace.json  Codex catalog
.opencode/marketplace.json        OpenCode catalog
plugins/<plugin>/
  .claude-plugin/plugin.json      Claude Code manifest
  .codex-plugin/plugin.json       Codex manifest
  skills/<skill>/SKILL.md

When a plugin changes, bump the version in both of its manifests. Keep them equal. Claude Code and Codex only pick up a change after a version bump.