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

With no annotations provided, the description carries the full burden of behavioral disclosure. It usefully states what the tool returns (host, scheme, HTTP status) and adds a meaningful retention detail ('Page content is not stored'). However, it does not mention whether the request follows redirects, what errors or edge cases occur (invalid URLs, non-HTTPS), or any rate-limit or authorization constraints, leaving notable behavioral gaps for an unannotated tool.

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?

Two short sentences with zero filler. The primary outcome is front-loaded ('Return host, scheme, and HTTP status for a URL'), and the non-storage disclaimer is a concise secondary clause. Every word earns its place, and the structure is easy to scan.

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?

For a tool with four parameters, no annotations, and no output schema, the description is too sparse. It does not explain how host, json, and zone relate to the stated URL-status purpose, what inputs are required or optional in practice, or what the caller should expect in terms of return structure or failure modes. The 'Page content is not stored' note is useful, but the overall context is incomplete for confident invocation.

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 100%, so the baseline is 3 per the rubric. The description adds no meaning beyond the schema; it only references 'a URL,' while the schema already documents the url, host, json, and zone parameters individually. It does not clarify why an HTTP-status checker would accept a timezone or JSON text, which would have been valuable extra semantics.

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 states a specific verb and resource: 'Return host, scheme, and HTTP status for a URL.' This clearly conveys what the tool does and distinguishes it from content-fetching tools by adding 'Page content is not stored.' However, it does not explicitly differentiate it from sibling citation-related tools, and the name 'citation' is broader than the HTTP-status behavior described, causing slight ambiguity.

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 provides no guidance on when to use this tool versus alternatives, no conditions, and no exclusions. It implies usage through the stated behavior but never says 'use this when you need X' or 'instead of Y.' An agent would have to infer the appropriate context from the parameter schema and description alone.

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