Coding agents

This guide installs the Instant plugin in Claude Code, Codex, Grok Build, or Cursor. The plugin connects your agent to Instant's hosted MCP server, and adds skills and slash commands so the agent knows when to search, when to verify, and how to read the results.

Requirements

The plugin is free. No account, no API key. You need one of these agents installed:

• Claude Code
• Codex
• Grok Build
• Cursor or Grok Bot

What the plugin adds

The plugin is a hosted MCP pointer plus Markdown. Nothing runs code on your machine.

• MCP server — https://mcp.instant.ai/mcp, with the tools listed below.
• Skills — instant tells the agent when to call the tools and how to interpret results. domain-brainstorm generates name ideas and checks them as it goes.
• Commands — /domain <name> [tld ...] checks a name across extensions, or a list of full domain names. /domain-variations <name> builds prefix and suffix alternatives for a taken name. Claude Code namespaces both as /instant:domain and /instant:domain-variations.

Tools

• search_domains — Checks one name across many extensions. Takes a name without an extension and returns the registration status for each extension you choose, or for the popular ones by default, from an index rebuilt daily.
• generate_domain_variations — Alternatives when your first choice is taken. Adds common prefixes and suffixes to a name and returns the .com for each, sorted by how common the added word is.
• check_domain_availability — Check registration status for up to 50 full domain names from the daily index. Uncovered extensions have unknown status. Each result links to the domain’s research page; confirm availability with the registrar before purchase.
• search_trademarks — Search indexed USPTO trademark records with exact, prefix, fuzzy, or phonetic matches. Filter by status, class, or owner, and return up to 100 matches. Results include the snapshot freshness.
• get_trademark_details — Look up a trademark by its eight-digit USPTO serial number. Get its status, dates, owners, classes, goods and services, filing flags, and snapshot freshness.

Install

Pick your agent and run the commands in a terminal. The first command registers the instant-labs/agent-plugins marketplace; the second installs the plugin from it.

Cursor and Grok Bot install from the marketplace instead of the terminal: open Settings → Plugins and search for Instant. The Cursor guide covers adding the MCP server on its own, without the skills.

Use the plugin

Start a new session so the agent loads the plugin, then ask in plain language:

Is acme.dev available?

I need a name for a coffee subscription app. Check what's free.

Or run a command directly:

/domain acme
/domain acme.com acme.io acme.dev
/domain-variations acme

Every result links to the domain's research page, with its registration status, registrar prices, and WHOIS details.

Troubleshooting

instant not found Run the marketplace command first. The install command reads the plugin from the instant-marketplace catalog it registers.

You already installed instantdomainsearch That is the plugin's old id. Uninstall it, update the marketplace, and install instant; the repository README has the commands for each agent.

The tools do not appear Start a new session. Agents load plugins at startup.

Connection errors Verify the server URL in the plugin is exactly https://mcp.instant.ai/mcp.

Need help?

Contact our team at hello@instant.ai, or open an issue on instant-labs/agent-plugins.