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fin_scan

Perform a stealth FIN scan to identify open ports on a target IP or hostname, with support for custom Nmap arguments. Use for firewall evasion when SYN scans are blocked.

Instructions

Perform a FIN scan on the specified target with optional custom arguments.

Args: target (str): The target IP address or hostname. args (str): Additional Nmap command-line arguments.

Returns: dict: The FIN scan results.

Input Schema

TableJSON Schema
NameRequiredDescriptionDefault
targetYes
argsNo
Behavior2/5

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

No annotations provided; description does not disclose important behavioral traits such as stealth level, required privileges, or potential network impact of a FIN scan.

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?

Concise docstring format with clear purpose and parameter descriptions, though the Returns line is somewhat redundant given no output schema.

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 no annotations, no output schema, and minimal parameter info, the description lacks context on use cases, prerequisites, and expected behavior beyond the basic operation.

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?

With 0% schema coverage, description adds value by defining parameter types and roles (target as IP/hostname, args as additional Nmap arguments), compensating for schema gaps.

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?

Description clearly states the action ('Perform a FIN scan') and the target resource, distinguishing it from sibling tools which are other scan types.

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 to use a FIN scan versus alternatives like SYN scan or TCP scan. The agent lacks context to choose correctly.

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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