Enable a disabled interception rule.
AI agents use proxy_enable_rule to create or update resources in Proxy — usually the action step of a workflow, after the agent has gathered context. Every call changes real data in your Proxy environment.
This tool modifies the state of an existing interception rule by enabling it. This is a reversible state change (it can be disabled again), making it a Write operation. However, enabling a MITM interception rule could have significant security implications as it activates traffic interception/modification capabilities, warranting a medium severity rating.
From the tool's definition Enable a disabled interception rule
Documented attack patterns abuse exactly the kind of access proxy_enable_rule gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and Proxy, and nothing reaches the server without passing your rules. This is the rule we recommend for proxy_enable_rule:
{
"version": "1",
"default": "deny",
"tools": {
"proxy_enable_rule": {
"limits": [
{
"counter": "proxy_enable_rule_rate",
"window": "minute",
"max": 30,
"scope": "grant"
}
]
}
}
}proxy_enable_rule 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.
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Enable a disabled interception rule. It is categorised as a Write tool in the Proxy MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.
Register the Proxy MCP server in PolicyLayer and add a rule for proxy_enable_rule: 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 Proxy. Nothing to install.
proxy_enable_rule 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 proxy_enable_rule 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 proxy_enable_rule. 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.
proxy_enable_rule is provided by the Proxy MCP server (yfe404/proxy-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Start from Proxy, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.
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