caddy_add_site

THE RISK

Medium Risk

Why caddy_add_site needs a policy

This tool creates or modifies a persistent configuration file (Caddyfile) and reloads the service. While not destructive, it has Write semantics as it creates new site blocks. The severity is high because misconfigured reverse-proxy entries could redirect traffic, expose services, or cause availability issues.

From the tool's definition Tool name 'caddy_add_site' and description 'Add a reverse-proxy site block to the Caddyfile and reload' indicate creation of new configuration that modifies the Caddyfile and triggers a reload operation.

Documented attack patterns abuse exactly the kind of access caddy_add_site gives an agent:

POLICY

How to control caddy_add_site

PolicyLayer is an MCP gateway — it sits between your AI agents and Crow, and nothing reaches the server without passing your rules. This is the rule we recommend for caddy_add_site:

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "caddy_add_site": {
      "limits": [
        {
          "counter": "caddy_add_site_rate",
          "window": "minute",
          "max": 30,
          "scope": "grant"
        }
      ]
    }
  }
}

caddy_add_site stays usable, but capped — an agent stuck in a loop can't make hundreds of changes a minute. Everything else on the server is denied unless you say otherwise.

Create a free account and register Crow — nothing to install.
Add this policy — paste it, or build it visually.
Point your MCP client (Claude, Cursor, anything) at your gateway URL.

LIMIT THIS TOOL →

Free to start. No card required.

EXPLORE

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Go deeper

The MCP Attack Database → Documented attack patterns against MCP deployments — and the policies that stop them.
Argument validation → Checking tool call arguments against schema and policy before they run.
Scoped token → Per-person credentials that grant a defined subset of servers and tools.
Rate Limiting MCP Tool Calls: A Practical Guide →
MCP Security: Why Prompt Guardrails Aren't Enough →

FAQ

Questions about caddy_add_site

What does the caddy_add_site tool do? +

Add a reverse-proxy site block to the Caddyfile and reload. For anything beyond. It is categorised as a Write tool in the Crow MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.

How do I enforce a policy on caddy_add_site? +

Register the Crow MCP server in PolicyLayer and add a rule for caddy_add_site: allow, deny, rate-limit, or require approval. Point your MCP client at the PolicyLayer proxy URL and the rule is enforced on every call, before it reaches Crow. Nothing to install.

What risk level is caddy_add_site? +

caddy_add_site is a Write tool with medium risk. Write tools should be rate-limited to prevent accidental bulk modifications.

Can I rate-limit caddy_add_site? +

Yes. Add a rate_limit block to the caddy_add_site rule in your PolicyLayer policy. For example, setting max: 10 and window: 60 limits the tool to 10 calls per minute. Rate limits are tracked per agent session and reset automatically.

How do I block caddy_add_site completely? +

Set action: deny in the PolicyLayer policy for caddy_add_site. The AI agent will receive a policy violation error and cannot call the tool. You can also include a reason field to explain why the tool is blocked.

What MCP server provides caddy_add_site? +

caddy_add_site is provided by the Crow MCP server (kh0pper/crow). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

Enforce policy on every Crow tool call.

Start from Crow, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.

CHECK YOUR STACK →