Zebbern Kali MCP

by zebbern

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Python

Local

vpn_status

Queries WireGuard and OpenVPN to list active VPN tunnels, including assigned IP addresses and active count.

Instructions

Get status of all active VPN connections.

Queries both WireGuard (via wg show) and OpenVPN (via PID file) and returns a list of active tunnels with their assigned IP addresses.

Returns: Dictionary with connections list, count, and active_count.

Example: vpn_status()

Input Schema

TableJSON Schema

Name	Required	Description	Default
No arguments

Output Schema

TableJSON Schema

Name	Required	Description	Default
`result`	Yes

Schema Changelog

Changes observed during successful MCP inspections.

First observedv1.0.0Jul 12, 2026

TDQS

A4.3/5.0

Behavior4/5

Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?

No annotations are provided, so the description carries the full burden. It discloses the internal mechanism (wg show, PID file) and the return structure. It does not mention any side effects or authentication needs, but these are not critical for a read-only status check.

Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.

Conciseness5/5

Is the description appropriately sized, front-loaded, and free of redundancy?

The description is concise with three sentences plus an example. It front-loads the purpose and provides essential details without unnecessary words.

Shorter descriptions cost fewer tokens and are easier for agents to parse. Every sentence should earn its place.

Completeness5/5

Given the tool's complexity, does the description cover enough for an agent to succeed on first attempt?

The output schema exists, but the description still explains the return values. It covers the tool's functionality, sources, and output structure. For a simple zero-parameter tool, this is complete.

Complex tools with many parameters or behaviors need more documentation. Simple tools need less. This dimension scales expectations accordingly.

Parameters4/5

Does the description clarify parameter syntax, constraints, interactions, or defaults beyond what the schema provides?

The tool has zero parameters, and schema coverage is 100% trivially. According to guidelines, baseline score is 4. The description adds no parameter info because none exists.

Input schemas describe structure but not intent. Descriptions should explain non-obvious parameter relationships and valid value ranges.

Purpose5/5

Does the description clearly state what the tool does and how it differs from similar tools?

The description clearly states the tool retrieves status of all active VPN connections, specifying both WireGuard and OpenVPN sources. It distinguishes itself from sibling tools like vpn_connect and vpn_disconnect.

Agents choose between tools based on descriptions. A clear purpose with a specific verb and resource helps agents select the right tool.

Usage Guidelines3/5

Does the description explain when to use this tool, when not to, or what alternatives exist?

The description does not explicitly state when to use this tool versus alternatives. However, it is the only status-related VPN tool, so the context is clear. No exclusion criteria or prerequisites are mentioned.

Agents often have multiple tools that could apply. Explicit usage guidance like "use X instead of Y when Z" prevents misuse.

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