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coreyhines

coreyhines/opnsense-mcp

mkfw_rule

Create a new firewall rule on OPNsense with configurable source, destination, protocol, and action, and optionally apply the changes immediately.

Instructions

Create a new firewall rule and optionally apply changes

Input Schema

TableJSON Schema
NameRequiredDescriptionDefault
descriptionYesDescription of the rule (required)
interfaceNoInterface name (default: 'lan')
actionNopass, block, or reject (default: 'pass')
protocolNoany, tcp, udp, icmp, etc. (default: 'any')
source_netNoSource network/IP (default: 'any')
source_portNoSource port (default: 'any')
destination_netNoDestination network/IP (default: 'any')
destination_portNoDestination port (default: 'any')
directionNoin or out (default: 'in')
ipprotocolNoinet or inet6 (default: 'inet')
enabledNotrue or false (default: true)
gatewayNoGateway to use (default: '')
applyNoWhether to apply changes immediately (default: true)
Behavior2/5

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

With no annotations, the description carries the full burden. It only mentions 'optionally apply changes', but does not disclose what happens after creation, such as rule ordering, validation, or permissions. Minimal behavioral info.

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?

Single sentence with no redundancy. The key action is front-loaded, making it efficient and easy to parse.

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 13 parameters, no output schema, and no annotations, the description lacks critical context such as return values, rule ordering, validation, and the 'apply' mechanism. It is incomplete for a tool of this complexity.

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?

Schema description coverage is 100% with clear parameter descriptions. The description does not add extra meaning beyond the schema, so baseline score of 3 is appropriate.

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 'Create a new firewall rule', which is a specific verb+resource combination. It distinguishes from sibling tools like set_fw_rule (modify) and rmfw_rule (delete).

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?

No guidance on when or when not to use this tool. It does not mention alternatives among sibling tools, such as using fw_rules to list rules or set_fw_rule to modify existing ones.

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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