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gensecaihq

pfSense MCP Server

by gensecaihq

create_nat_onetoone_mapping

Create a 1:1 NAT mapping on pfSense, translating a public external subnet to an internal source network, with options for destination filtering and immediate application.

Instructions

Create a 1:1 NAT mapping

Input Schema

TableJSON Schema
NameRequiredDescriptionDefault
typeNoNAT type (e.g., "binat")
descrNoOptional description
sourceYesInternal source network/address to map
disabledNoWhether the mapping starts disabled
externalYesExternal subnet (the public/translated address or subnet)
interfaceYesInterface for the mapping (wan, lan, opt1, etc.)
destinationNoDestination filter for the mapping
apply_immediatelyNoWhether to apply changes immediately

Output Schema

TableJSON Schema
NameRequiredDescriptionDefault

No arguments

Behavior2/5

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

Annotations indicate the tool is not read-only and not destructive, but the description adds no behavioral context beyond 'create'. It does not mention whether changes need to be applied separately, whether the mapping is created active, or any side effects.

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

Conciseness4/5

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

The description is a single, front-loaded sentence with no wasted words. It is concise, but the brevity comes at the cost of missing helpful usage and behavioral details.

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?

For an 8-parameter create operation, the description lacks operational context: no mention of when to use it relative to other NAT tools, no relationship to apply_nat_onetoone_changes, and no explanation of the apply_immediately parameter's role. The output schema does not compensate for this missing workflow guidance.

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%, so the baseline is 3. The description adds no parameter-specific details, but the schema adequately documents all eight parameters, so no significant gap 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 uses a specific verb ('Create') and resource ('1:1 NAT mapping'), clearly distinguishing this from sibling tools like create_nat_port_forward and create_nat_outbound_mapping. It effectively communicates the tool's core function.

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 is provided on when to use this tool versus alternatives such as create_nat_port_forward or create_nat_outbound_mapping. The phrase '1:1 NAT mapping' implies a use case but does not state exclusions or reference sibling tools.

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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