AI agents use hosts_update to create or update resources in Remnawave — usually the action step of a workflow, after the agent has gathered context. Every call changes real data in your Remnawave environment.
The tool modifies existing host configuration data but does not delete or destroy it (which would be Destructive). It does not execute arbitrary code or commands (which would be Execute). In a VPN panel context, updating hosts affects network infrastructure configuration, so the severity is medium—misuse could disrupt VPN services but changes are typically reversible via subsequent updates or rollback.
From the tool's definition Tool name 'hosts_update' and description 'Update an existing host' indicate modification of existing data in a VPN management system. This is a reversible Write operation.
Documented attack patterns abuse exactly the kind of access hosts_update gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and Remnawave, and nothing reaches the server without passing your rules. This is the rule we recommend for hosts_update:
{
"version": "1",
"default": "deny",
"tools": {
"hosts_update": {
"limits": [
{
"counter": "hosts_update_rate",
"window": "minute",
"max": 30,
"scope": "grant"
}
]
}
}
}hosts_update 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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Update an existing host. It is categorised as a Write tool in the Remnawave MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.
Register the Remnawave MCP server in PolicyLayer and add a rule for hosts_update: 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 Remnawave. Nothing to install.
hosts_update 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 hosts_update 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 hosts_update. 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.
hosts_update is provided by the Remnawave MCP server (trackline/mcp-remnawave). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Deterministic rules across all 153 Remnawave tools. Per-identity grants. Full audit log. Live in minutes. Nothing to install.
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153 Remnawave tools catalogued and risk-classified — across an index of 42,500+ MCP servers.