CVE MCP Server

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

With no annotations provided, the description carries the full burden. It discloses the tool's behavior by mentioning it returns specific data (verdicts, malicious flag, etc.) and uses URLScan.io, which implies external API usage. However, it doesn't cover important behavioral aspects like rate limits, authentication needs, error handling, or whether it performs active scanning vs. querying existing data. It adds some context but leaves gaps.

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

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

The description is appropriately sized and front-loaded: the first sentence states the core purpose and data source, the second lists return values, and the Args section efficiently explains the parameter. Every sentence earns its place with no wasted words, and the structure is clear and logical.

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

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

Given the tool's moderate complexity (single parameter, security-focused), no annotations, but with an output schema (which handles return values), the description is mostly complete. It covers purpose, parameter semantics, and data source well. However, it could be more complete by addressing behavioral aspects like rate limits or error cases, though the output schema mitigates some gaps.

Complex tools with many parameters or behaviors need more documentation. Simple tools need less. This dimension scales expectations accordingly.

Does the description clarify parameter syntax, constraints, interactions, or defaults beyond what the schema provides?

Schema description coverage is 0%, so the description must compensate fully. It does this excellently by explaining the single parameter 'url_or_domain' with clear semantics: it accepts either a full URL or a bare domain, and provides examples (https://example.com/path vs. example.com). This adds crucial meaning beyond the schema's basic string type.

Input schemas describe structure but not intent. Descriptions should explain non-obvious parameter relationships and valid value ranges.

Does the description clearly state what the tool does and how it differs from similar tools?

The description clearly states the tool's purpose with specific verb ('Check') and resource ('URL or domain'), and distinguishes it from siblings by specifying it uses URLScan.io for malicious activity detection. It explicitly mentions what it returns (scan verdicts, malicious flag, score, categories), which helps differentiate from other security tools like check_ip_reputation or get_domain_intel.

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

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

The description implies usage context by mentioning 'malicious activity' detection, suggesting when this tool would be appropriate. However, it doesn't explicitly state when to use this vs. alternatives like check_ip_reputation or get_domain_intel, nor does it provide exclusions or prerequisites. The guidance is present but not comprehensive.

Agents often have multiple tools that could apply. Explicit usage guidance like "use X instead of Y when Z" prevents misuse.