Capture network traffic on a VM. Args: vm_name: VM name to capture traffic from interface: Network interface to capture on duration: Capture duration in seconds filter: Optional BPF filter expression user_id: Optional user ID (admin only) Returns: Traffic capture result with download link
AI agents call capture_network_traffic to retrieve information from Ludus FastMCP without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
Network traffic capture is fundamentally a read operation that observes and retrieves data without altering system state. However, severity is medium rather than low because captured traffic may contain sensitive information (credentials, PII, proprietary data), and an AI agent with access to this tool could exfiltrate confidential data from monitored systems.
From the tool's definition Tool name 'capture_network_traffic' and description indicate retrieval of network traffic data. Returns 'traffic capture result with download link' — a data retrieval operation with no modification or deletion of target system state.
Risk signalsAdmin/system-level operation
Documented attack patterns abuse exactly the kind of access capture_network_traffic gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and Ludus FastMCP, and nothing reaches the server without passing your rules. This is the rule we recommend for capture_network_traffic:
{
"version": "1",
"default": "deny",
"tools": {
"capture_network_traffic": {}
}
}capture_network_traffic is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.
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Capture network traffic on a VM. Args: vm_name: VM name to capture traffic from interface: Network interface to capture on duration: Capture duration in seconds filter: Optional BPF filter expression user_id: Optional user ID (admin only) Returns: Traffic capture result with download link. It is categorised as a Read tool in the Ludus FastMCP MCP Server, which means it retrieves data without modifying state.
Register the Ludus Fast MCP server in PolicyLayer and add a rule for capture_network_traffic: 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 Ludus FastMCP. Nothing to install.
capture_network_traffic is a Read tool with low risk. Read-only tools are generally safe to allow by default.
Yes. Add a rate_limit block to the capture_network_traffic 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 capture_network_traffic. 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.
capture_network_traffic is provided by the Ludus Fast MCP server (tjnull/ludus-fastmcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Deterministic rules across all 201 Ludus FastMCP tools. Per-identity grants. Full audit log. Live in minutes. Nothing to install.
Free to start. No card required.
201 Ludus FastMCP tools catalogued and risk-classified — across an index of 42,500+ MCP servers.