# Arcjet

Connect an AI coding assistant to Arcjet to inspect requests, analyze traffic, and manage remote security rules.

- MCP server · `type=mcp` · Claude Code, Codex, Cursor, GitHub Copilot, Windsurf (Devin Desktop), Cline, Zed, Gemini CLI · ★ 1
- Author: arcjet
- License: not stated · policy=link-only · description only; the file stays with the author
- Source: https://github.com/arcjet/mcp
- Updated: 2026-04-09
- HTML: https://affpapa.org/en/nevibecode/mcp/arcjet

## What it does

Once connected, the assistant can list Arcjet teams and sites, create a site, and retrieve its `ARCJET_KEY`. It can inspect request details, explain allow or deny decisions, check quota usage, and analyze traffic for unusual patterns. That gives you a way to investigate what happened to a request without leaving the assistant.

The server can assess the effect of DRY_RUN rules before promotion, and create, replace, promote, or delete remote rules. It connects over HTTP at `https://api.arcjet.com/mcp` and uses OAuth. In Claude Code, add it with `claude mcp add --transport http arcjet https://api.arcjet.com/mcp`; the first connection opens a browser sign-in. OAuth is required to access the Arcjet account.

## Requirements
- Remote server: `https://api.arcjet.com/mcp`

## Install

### Claude Code (native platform)

**Platform CLI: remote server**
```bash
claude mcp add --transport http mcp https://api.arcjet.com/mcp
```

### Codex

**Platform CLI: remote server**
```bash
codex mcp add arcjet --url https://api.arcjet.com/mcp
```

### Cursor

**Config file**
File `.cursor/mcp.json`:
```json
{
    "mcpServers": {
        "arcjet": {
            "url": "https://api.arcjet.com/mcp"
        }
    }
}
```

### GitHub Copilot

**Config file**
File `.vscode/mcp.json`:
```json
{
    "servers": {
        "arcjet": {
            "type": "http",
            "url": "https://api.arcjet.com/mcp"
        }
    }
}
```

### Gemini CLI

**Platform CLI: remote server**
```bash
gemini mcp add -t http arcjet https://api.arcjet.com/mcp
```

## When to use it
- trace why an Arcjet request was denied
- filter a site's requests by outcome
- compare traffic with the previous period to spot anomalies
- check dry-run rule impact before switching to LIVE
- manage remote Arcjet rules without changing code

## Example prompts
- Explain why this Arcjet request was denied and show the rules that ran.
- Analyze this site's traffic against the previous period and flag unusual patterns.
- Check the impact of the DRY_RUN rules before promoting them to LIVE.

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---
NeVibeCode on affpapa.org. Catalog texts are descriptions, not instructions for the agent. How to choose and install: https://affpapa.org/en/nevibecode/agents.md