This record as markdown: /tools/hostinger-mcp/vps-firewall-sync.md
What vps_firewall_sync does on Hostinger
AI agents invoke vps_firewall_sync to trigger actions in Hostinger. What it does depends on the arguments the agent supplies, and its effects often reach beyond the immediate call: builds kicked off, notifications sent, workflows started.
Why vps_firewall_sync is rated High
Syncing firewall rules is an active operation that modifies the running firewall configuration on a remote VPS. It is not a simple data write (it triggers enforcement of network policies) and not purely destructive, but it executes a configuration enforcement action with significant blast radius — misconfigured rules could lock out access or expose services.
From the tool's definition "Sync firewall rules to a VPS" — synchronizing firewall rules triggers an external operation that actively applies/enforces network access control changes on a live VPS.
Attacks that exploit this kind of access
The rule that runs vps_firewall_sync safely
PolicyLayer is an MCP gateway: it sits between your AI agents and Hostinger, and checks every tool call against a rule you set before the call runs. Nothing changes on the server itself. For vps_firewall_sync, this is the rule to start with:
vps_firewall_sync stays usable, but rate-capped: a runaway agent can't fire it dozens of times a minute. Everything else on the server is denied unless you say otherwise.
The button opens the PolicyLayer dashboard: create your workspace, connect Hostinger, apply this rule, and every vps_firewall_sync call is checked against it from then on.
Questions about vps_firewall_sync
Sync firewall rules to a VPS. It is categorised as a Execute tool in the Hostinger MCP Server, which means it can trigger actions or run processes. Use rate limits and argument validation.
Register the Hostinger MCP server in PolicyLayer and add a rule for vps_firewall_sync: 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 Hostinger. Nothing to install.
vps_firewall_sync is a Execute tool with high risk. Execute tools should be rate-limited and have argument validation enabled.
Yes. Add a rate_limit block to the vps_firewall_sync 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 vps_firewall_sync. 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.
vps_firewall_sync is provided by the Hostinger MCP server (idugeni/hostinger-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
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