> ## Documentation Index
> Fetch the complete documentation index at: https://docs.fastcac.com/llms.txt
> Use this file to discover all available pages before exploring further.

# AI coding agents

> Teach Claude Code, Cursor, Codex and other agents to build on the FastCAC API.

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

```bash theme={null}
npx skills add devgenix/fastcac-skills --skill fastcac-api
```

The [skills CLI](https://github.com/vercel-labs/skills) 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](https://github.com/devgenix/fastcac-skills).

## Claude Code plugin

Installs the skill and connects the docs MCP server below:

```text theme={null}
/plugin marketplace add devgenix/fastcac-skills
/plugin install fastcac-developers@fastcac
```

## Search these docs from your agent

The docs MCP server, `https://docs.fastcac.com/mcp`, lets an agent search and read these pages.

```bash theme={null}
claude mcp add --transport http fastcac-docs https://docs.fastcac.com/mcp
```

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](https://docs.fastcac.com/llms.txt) lists them all.

> [!NOTE]
>
> 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](https://fastcac.com/ai).


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