Add a reverse proxy route. The most common operation — just specify where traffic comes from and where it goes. Example: from=
AI agents use caddy_reverse_proxy to create or update resources in Caddy — usually the action step of a workflow, after the agent has gathered context. Every call changes real data in your Caddy environment.
Adding a reverse proxy route creates new network traffic routing rules and modifies the server's configuration reversibly. This is a Write operation (creates/modifies data) rather than Execute because it configures infrastructure rather than triggering arbitrary code execution.
From the tool's definition Tool description states 'Add a reverse proxy route' — an explicit create/modify operation. The server manages Caddy web servers and this tool modifies routing configuration by specifying traffic source and destination.
Documented attack patterns abuse exactly the kind of access caddy_reverse_proxy gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and Caddy, and nothing reaches the server without passing your rules. This is the rule we recommend for caddy_reverse_proxy:
{
"version": "1",
"default": "deny",
"tools": {
"caddy_reverse_proxy": {
"limits": [
{
"counter": "caddy_reverse_proxy_rate",
"window": "minute",
"max": 30,
"scope": "grant"
}
]
}
}
}caddy_reverse_proxy 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.
Free to start. No card required.
Add a reverse proxy route. The most common operation — just specify where traffic comes from and where it goes. Example: from=. It is categorised as a Write tool in the Caddy MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.
Register the Caddy MCP server in PolicyLayer and add a rule for caddy_reverse_proxy: 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 Caddy. Nothing to install.
caddy_reverse_proxy is a Write tool with medium risk. Write tools should be rate-limited to prevent accidental bulk modifications.
Yes. Add a rate_limit block to the caddy_reverse_proxy 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.
Set action: deny in the PolicyLayer policy for caddy_reverse_proxy. 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.
caddy_reverse_proxy is provided by the Caddy MCP server (yawlabs/caddy-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Start from Caddy, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.
Free to start. No card required.
18 Caddy tools catalogued and risk-classified — across an index of 43,000+ MCP servers.