Instant agent plugins

Plugins from instant.ai for Claude, ChatGPT, and coding agents. Each plugin bundles an MCP server pointer, skills that teach the agent when and how to use it, and slash commands. The same plugin directory installs into Claude chat, Cowork, Claude Code, ChatGPT, Codex, Cursor, Grok Bot, and Grok Build; only the manifest file differs per client.

Plugin	What it does	MCP server
instant	Domain availability across hundreds of extensions, bulk checks, alternatives when a name is taken, and USPTO trademark search	https://mcp.instant.ai/mcp, no auth

Nothing here runs code on your machine. Every plugin is a hosted MCP pointer plus markdown. See each plugin's README for the endpoints it calls.

Install

The marketplace name is instant-marketplace; plugin ids are the directory names under plugins/.

Claude Code

claude plugin marketplace add instant-labs/agent-plugins
claude plugin install instant@instant-marketplace

Claude chat and Cowork

Install Instant from the Claude directory.

To install from this repository instead:

1. Open Customize → Plugins → Add → Add marketplace and enter https://github.com/instant-labs/agent-plugins.
2. Install Instant from instant-marketplace.
3. Open the plugin's Connectors tab and add or connect the Instant server at https://mcp.instant.ai/mcp. No account or sign-in is needed for Instant. On Claude Team and Enterprise, an Owner first adds the connector for the organization.
4. Try "Check shipwright across .com, .dev, .io, and .ai" or "Brainstorm five names for a matcha cafe and check their .com registration status."

Skills and commands work in chat and Cowork; chat treats commands as skills. If you already added the Instant connector, use the same server URL so Claude can reuse that connection.

ChatGPT

Install Instant from the ChatGPT plugin directory. No account or sign-in is needed for Instant.

Codex

codex plugin marketplace add https://github.com/instant-labs/agent-plugins
codex plugin add instant@instant-marketplace

Cursor and Grok Bot

Search for Instant under Settings → Plugins. If it is not listed yet, click Import under Team Marketplaces and paste https://github.com/instant-labs/agent-plugins, then install it from there.

Grok Build

grok plugin marketplace add instant-labs/agent-plugins
grok plugin install instant --trust

Skills only

npx skills add instant-labs/agent-plugins

This installs the skills without the MCP server. Add the server yourself from instant.ai/mcp.

Upgrading from instantdomainsearch

We renamed this plugin. The plugin id, its main skill, and its MCP server are now instant instead of instantdomainsearch, and the server lives at https://mcp.instant.ai/mcp. The marketplace name is still instant-marketplace.

Your client treats the new id as a different plugin, so an existing install keeps running the old one until you replace it. The old endpoint stays online, so nothing breaks in the meantime. To switch:

Claude Code:

claude plugin uninstall instantdomainsearch@instant-marketplace
claude plugin marketplace update instant-marketplace
claude plugin install instant@instant-marketplace

Codex:

codex plugin remove instantdomainsearch@instant-marketplace
codex plugin marketplace upgrade
codex plugin add instant@instant-marketplace

Grok Build:

grok plugin uninstall instantdomainsearch
grok plugin marketplace update
grok plugin install instant --trust

Cursor and Grok Bot: remove Instant Domain Search under Settings → Plugins, refresh the marketplace, and install Instant.

Start a new session afterwards so the renamed skills and tools load. In Claude Code the commands are now /instant:domain and /instant:domain-variations. If you installed the skills only, remove the old instantdomainsearch skill and run npx skills add instant-labs/agent-plugins again. If you added the MCP server by hand, replace its entry with instant at https://mcp.instant.ai/mcp.

Layout

.grok-plugin/marketplace.json      catalog read by Grok Build
.claude-plugin/marketplace.json    catalog read by Claude and Claude Code
.cursor-plugin/marketplace.json    catalog read by Cursor and Grok Bot
.agents/plugins/marketplace.json   catalog read by Codex
plugins/<name>/
  .grok-plugin/plugin.json         one manifest per client, same content
  .claude-plugin/plugin.json
  .cursor-plugin/plugin.json
  .codex-plugin/plugin.json        adds the `interface` block Codex shows in its directory
  .mcp.json                        MCP servers, `type: http`
  .cursor-mcp.json                 the same servers in Cursor's format (no `type`)
  skills/<skill>/SKILL.md
  commands/<command>.md
  assets/
  README.md
scripts/validate.py                checks manifests and catalogs agree

Skills refer to tools by their MCP name (search_domains) and the server (instant), never a client's prefixed form, so one skill file serves every client.

Checks

Run python3 scripts/validate.py before you push; CI runs the same check.

License

MIT. See LICENSE.