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osint-mcp-server

by badchars

censys_hosts

Search Censys to discover hosts matching your query. Get IP addresses, services, ports, location, and ASN for threat intelligence and attack surface mapping.

Instructions

Search Censys for hosts matching a query. Returns IPs, services, ports, location, ASN. Requires CENSYS_API_ID + CENSYS_API_SECRET.

Input Schema

TableJSON Schema
NameRequiredDescriptionDefault
queryYesCensys search query
per_pageNoResults per page (max 100, default: 25)
Behavior3/5

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

No annotations provided, so description carries full burden. It mentions required API keys but does not disclose rate limits, pagination behavior, or whether results are live or cached. This is adequate but incomplete.

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 two concise sentences with no redundancy. It front-loads the main action and key details, but could be slightly more structured with a clear outcome statement.

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

Completeness4/5

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

For a simple tool with two parameters and no output schema, the description covers purpose, return fields, and authentication. It is mostly complete but missing details on result format or pagination.

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% with descriptions for both parameters. The description does not add additional context beyond the schema, such as query syntax requirements or the impact of per_page on results.

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 the tool searches for hosts, specifies the data returned (IPs, services, ports, location, ASN), and differentiates from sibling tools like censys_host_details which likely focus on single host details.

Agents choose between tools based on descriptions. A clear purpose with a specific verb and resource helps agents select the right tool.

Usage Guidelines3/5

Does the description explain when to use this tool, when not to, or what alternatives exist?

The description does not explicitly state when to use this tool versus alternatives like censys_host_details or other search tools. The purpose is clear but no direct comparison or usage guidance is provided.

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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