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OPNSense MCP Server

OPNSense MCP Server

by vespo92
OverviewSchemaSourceRelated ServersDiscussionsAdmin
TypeScript
Hybrid

list_dhcp_leases

Retrieve and filter all DHCP leases on an OPNSense firewall by interface using the MCP server. Simplify network management by accessing active lease details for troubleshooting and monitoring.

Instructions

List all DHCP leases

Tool call template

This tool declares no required parameters. Add optional parameters from the input schema as needed.

{
  "id": 1,
  "jsonrpc": "2.0",
  "method": "tools/call",
  "params": {
    "arguments": {},
    "name": "list_dhcp_leases"
  }
}

Input Schema

NameRequiredDescriptionDefault
interfaceNoFilter by interface (optional)

Schema Changelog

Changes observed during successful MCP inspections.

  1. First observedv1.0.0

TDQS

C2.9/5.0
Behavior2/5

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

No annotations are provided, so the description carries full responsibility for behavioral disclosure. 'List all DHCP leases' implies a read-only operation, but it doesn't specify whether this requires authentication, what format the output takes, if there are rate limits, or how many results are returned. For a network tool with zero annotation coverage, this leaves significant gaps.

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 a single, efficient sentence with no wasted words. It's front-loaded with the core purpose ('List all DHCP leases'), making it immediately clear what the tool does.

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

Completeness2/5

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

Given the lack of annotations and output schema, the description is incomplete for a network tool. It doesn't explain what DHCP leases are, what data is returned, or any behavioral aspects like permissions or limitations. For a tool in a complex networking context with many siblings, this minimal description leaves too much undefined.

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

Parameters3/5

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

The schema description coverage is 100%, with the single parameter 'interface' documented as an optional filter. The description mentions 'all DHCP leases' but doesn't add meaning beyond what the schema provides about filtering. With high schema coverage, the baseline score of 3 is appropriate.

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

Purpose4/5

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

The description clearly states the action ('List') and resource ('DHCP leases'), making the purpose immediately understandable. However, it doesn't differentiate this tool from other list tools in the sibling set (like list_arp_entries, list_backups, list_vlans), which would require specifying what makes DHCP leases distinct.

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

Usage Guidelines2/5

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

The description provides no guidance on when to use this tool versus alternatives. With many sibling tools available (including other list operations and network-related tools), there's no indication of context, prerequisites, or comparisons to help an agent choose appropriately.

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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