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 says nothing about what happens on an invalid id, whether the call errors or returns empty, or what a package record contains. Listing the valid ids is the only behavioral content and it merely restates the schema.

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 front-loaded sentence with no filler. The enumerated values, however, are redundant with the schema and consume most of the sentence's 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?

The tool is trivial (one enum parameter, no nesting) and no output schema exists, so the description should say something about what a package record returns or how the distinct package types differ. It is minimally sufficient to invoke, but leaves the agent guessing about the response.

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%, but the single parameter is a fully enumerated required string, so there is little semantic ambiguity to resolve. The description repeats the seven allowed values without adding meaning such as whether ids are case-sensitive or how they map to packages.

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: fetch one package by its id, which implicitly distinguishes it from the list-style sibling list_packages. The enumerated id values sharpen what 'package' means, though they duplicate the schema and the tool never names its sibling explicitly.

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 statement of when to use this versus list_packages or get_brand_overview, and no prerequisites or error conditions. The word 'One' weakly implies single-item retrieval, but an agent must infer the routing decision entirely on its own.

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