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Give your agent FastCAC’s skill and it knows the API before it writes a line: keys and test mode, errors, idempotency, webhooks, the wallet, registrations and business data.

Add the skill

The skills CLI installs it for Claude Code, Cursor, Codex, OpenCode and other agents. Add -g to install it for every project. It’s served here too: npx skills add https://docs.fastcac.com. The skill’s main file covers what every call needs. It points the agent to a reference for registering a business name, and one for searching, looking up, verifying and monitoring businesses, which it reads only when it needs them. Source and changes: github.com/devgenix/fastcac-skills.

Claude Code plugin

Installs the skill and connects the docs MCP server below:

Search these docs from your agent

The docs MCP server, https://docs.fastcac.com/mcp, lets an agent search and read these pages.
The Claude Code plugin above already adds it. For other agents, add it as a remote MCP server with that URL. Every page is also Markdown (add .md to its URL), and llms.txt lists them all.
Building for business owners who use ChatGPT or Claude themselves? FastCAC’s own MCP server lets their AI app check names and register a business with FastCAC. See fastcac.com/ai.