Arcjet - MCP Server

Arcjet is the runtime security platform that ships with your code. Enforce budgets, stop prompt injection, detect bots, and protect personal information with Arcjet's AI security building blocks.

The Arcjet MCP server gives AI coding assistants the skills of a security engineer. By connecting to the Arcjet MCP server, your AI coding tools can:

• List teams you belong to.
• List sites within a team.
• Create new sites within a team.
• Get site keys (ARCJET_KEY) for use in your projects.
• List requests received by a site with optional filtering.
• Explain decisions to understand why requests were allowed or denied.
• Get request details including headers, rules executed, and decision info.
• Get site quota usage and limits for the current billing window.
• Analyze traffic patterns, denial rates, top paths, and top IPs.
• Detect anomalies by comparing current traffic to the previous period.
• Investigate IPs with geo, threat intelligence, and request activity.
• Get dry-run impact analysis before promoting rules to live.
• Get a security briefing combining traffic, threats, anomalies, and recommendations.
• List remote rules configured for a site.
• Create remote rules with DRY_RUN or LIVE mode — configure rules with no code changes needed.
• Update remote rules by replacing the full rule configuration.
• Delete remote rules to immediately stop evaluation.
• Promote remote rules from DRY_RUN to LIVE after verification.

The MCP server is available at:

https://api.arcjet.com/mcp

It implements the latest MCP Authorization and Streamable HTTP specifications with OAuth-based authentication.

Supported clients

Any client that supports the latest MCP specification with Streamable HTTP transport and OAuth authorization is supported. This includes:

• ChatGPT
• Claude Code
• Claude Desktop
• Cursor
• VS Code with Copilot
• Windsurf
• Many others that implement the MCP specification.

Setup

ChatGPT

1. In ChatGPT, go to Settings.
2. Navigate to Connectors and select Add connection.
3. Enter https://api.arcjet.com/mcp as the server URL.
4. Select OAuth for authentication.
5. Click Create.

ChatGPT handles the OAuth flow automatically.

Claude Code

claude mcp add arcjet --transport http https://api.arcjet.com/mcp

Claude Code will open a browser for OAuth authentication on first connection. Once authenticated, you can use the /mcp command to verify the connection.

Claude Desktop

Remote MCP connections are available on Claude Desktop for users on [Pro, Max, Team, and Enterprise plans](https://support.anthropic.com/en/articles/11175166-getting-started-with-custom-connectors-using-remote-mcp).

1. Open Settings in the sidebar.
2. Navigate to Connectors and select Add custom connector.
3. Configure the connector:
   • Name: Arcjet
   • URL: https://api.arcjet.com/mcp

Cursor

Add to .cursor/mcp.json in your project:

{
  "mcpServers": {
    "arcjet": {
      "type": 

... [View full README on GitHub](https://github.com/arcjet/mcp#readme)