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

No annotations are provided, so the description carries the full behavioral burden, and it discloses nothing: not the criteria used to select alternatives, whether results are ranked, how many are returned, or whether an unknown package yields an error. Only 'read-only-ish list' is inferable from the verb.

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?

One short, front-loaded sentence with no filler. However, its brevity comes at the cost of substance rather than being tight-but-complete, so it falls short of a 5.

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 no annotations and no output schema, the description must explain what an 'alternative' result contains and how it is chosen. It omits both, leaving the tool's core semantics undefined for a caller who must decide between it and 23 siblings.

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% and the single parameter ('name', hex.pm package name) is fully documented in the schema. The description adds no format, case-sensitivity, or qualification details, so the baseline 3 applies.

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 verb ('Find') and resource ('alternative packages'), which is more than a tautology, but never says what makes a package 'alternative' (same category, similar features, comparable downloads) or that the input names the package being substituted. An agent cannot distinguish it cleanly from siblings like 'compare' or 'search'.

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?

No when-to-use guidance at all. It does not say whether to call this when a package is deprecated, unmaintained, or being replaced, nor does it point to any sibling (e.g. 'compare') for a different need.

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