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gensecaihq

pfSense MCP Server

by gensecaihq

create_alias

Create a new firewall alias on pfSense by specifying name, type (host, network, or port), and initial addresses. Supports optional per-entry descriptions and immediate apply.

Instructions

Create a new firewall alias

Input Schema

TableJSON Schema
NameRequiredDescriptionDefault
nameYesAlias name (max 31 characters, alphanumeric and underscores)
detailsNoOptional per-entry descriptions (same length as addresses)
addressesYesList of initial entries (IPs, networks, or ports depending on type)
alias_typeYesType of alias (host, network, port)
descriptionNoOptional description of the alias
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?

The description adds no behavioral context beyond the inherent meaning of 'create.' Annotations only indicate non-read-only and non-destructive, but the description does not disclose side effects, application timing, or relationship to firewall rules.

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

Conciseness3/5

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

The description is a single, straightforward sentence with no wasted words. However, for a tool with six parameters and alias-specific semantics, the text is under-sized and does not convey enough information to be considered appropriately structured.

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?

The description lacks essential context about what a firewall alias is, how it is used in rules, and the implications of the apply_immediately parameter. Given the presence of an output schema and sibling tools, the description does not provide sufficient contextual grounding for an agent to use the tool confidently.

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 input schema already provides comprehensive descriptions for all 6 parameters (100% coverage). The description references none of them directly, so it adds no additional parameter semantics beyond what the schema offers, warranting the baseline score.

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 identifies the action (create) and resource (firewall alias), making the tool's purpose evident. However, it does not explicitly differentiate from sibling alias tools like update_alias or search_aliases, so it misses the top score.

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?

There is no guidance on when to use create_alias versus other alias-related tools. The description only states the action without any context or exclusion criteria, leaving the agent with no information about alternatives or prerequisites.

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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