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schwarztim

theHarvester MCP Server

by schwarztim

theharvester_shodan

Retrieve detailed host information, including open ports and banners, by combining theHarvester with Shodan integration for a target domain.

Instructions

Run theHarvester with Shodan integration to get detailed host information including open ports and banners.

Input Schema

TableJSON Schema
NameRequiredDescriptionDefault
domainYesTarget domain
sourcesNoAdditional sources to combine with Shodan
Behavior2/5

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

With no annotations, the description must disclose behavioral traits. It only mentions output content (open ports, banners) but does not describe authorization needs, rate limits, or any side effects. The tool is likely read-only, but this is not explicitly stated.

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 sentence of 17 words that front-loads the verb and key information. Every word is necessary; there is no redundancy or clutter.

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

Completeness3/5

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

For a tool with no output schema, the description provides minimal output details (open ports, banners). It does not explain the format or other return values, but it is adequate for a simple reconnaissance tool. The presence of many sibling tools suggests a need for more distinction, which is partially met by the Shodan mention.

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 coverage is 100%, so the schema already documents both parameters. The description adds no additional meaning about the parameters beyond the schema fields, achieving 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 states the tool runs theHarvester with Shodan integration to obtain detailed host information including open ports and banners. This distinguishes it from sibling tools like theharvester_hosts or theharvester_emails, though it does not explicitly contrast them.

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 theharvester_search or theharvester_full_recon. The description only implies usage when Shodan-specific data is needed.

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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