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

Annotations already declare readOnly, idempotent, non-destructive and closed-world, so the safety profile is covered. The description adds one genuinely useful behavioral detail — that the deprecation message is null when there is none — but says nothing about lookup failures (unknown slug/package) or the shape of the response, and there is no output schema to fall back on.

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?

A single tight sentence with no filler, and the most important element (deprecation status) is front-loaded. It is a fragment rather than a complete sentence, which slightly hurts readability but costs nothing in length.

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 one-parameter read lookup this is close to sufficient, and the annotations carry the safety profile. However, with no output schema the description is the only source of return-value information, and it only names the fields without indicating whether status is boolean/string or how the verification date is formatted.

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?

With 100% schema description coverage and a single required parameter whose description already explains 'slug or npm package name' with an example, the schema does the work. The tool description adds no extra meaning about accepted forms or precedence when the string is ambiguous between a slug and a package name.

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 names the specific resource (deprecation status, npm deprecation message, verification date), so an agent can tell this is a deprecation-lookup tool. It is a noun-phrase fragment with no verb and never distinguishes itself from siblings like get_replacement, so it stops short of a 5.

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?

There is no guidance on when to call this versus get_replacement (the obvious follow-up for a deprecated server) or get_score. Nothing states prerequisites, e.g. that a slug or npm package name must already be known.

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