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

Annotations already declare read-only, idempotent, non-destructive and open-world behavior, so the safety profile is covered. The description adds genuinely useful context beyond that: a stated cost of $0.010, that payment instructions are returned, and that no provider account is required. It still omits failure modes or what happens if payment is not completed.

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 sentences, front-loaded with what is returned and its limit, with the commercial terms appended. Nothing is redundant, though 'the Saylor endpoint' is an unexplained internal name that costs a few words of clarity.

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?

With one parameter, no output schema, and no nested objects, the description does the necessary work: it describes the shape of the result set (up to five packages with named fields) and the non-obvious payment flow. A brief note on error or empty-result behavior would close the remaining gap.

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?

There is a single parameter with 100% schema description coverage ('Search terms, 2–160 characters'), so the schema already carries the constraint. The description adds no syntax, quoting, or scoping hints beyond the schema baseline.

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?

States a specific verb and resource ('Find npm packages') and enumerates the returned fields (versions, descriptions, ranking scores, source links) plus a result cap of five. It does not differentiate itself from the close sibling get_package_report, which an agent must still disambiguate on its own.

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 phrase 'for package discovery' implies a discovery use case, but there is no explicit when-to-use or when-not-to-use guidance, and no routing between this tool and get_package_report or verify_repository. Usage is inferable rather than stated.

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