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

Annotations already communicate read-only, idempotent, and non-destructive behavior. The description adds the 'across distributions' scoping constraint, which is useful context beyond the annotations. However, it does not disclose specific behavioral details such as output format, potential latency, or network dependencies.

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?

The description is a single concise sentence that is front-loaded with the action and resource. It contains zero redundant words and quickly conveys the tool's purpose.

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 simple read-only comparison tool with one parameter, the description is adequate. It defines the scope and purpose clearly, and the annotations cover safety. The lack of an output schema means a brief note on return format could improve completeness, but it is not essential given the simplicity.

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?

The schema has one parameter 'name' with pattern and length constraints but no description text. The description refers to 'a package's,' which implies that 'name' is the package name, adding some semantic meaning. However, schema description coverage is 0%, so the description only partially compensates and does not explicitly document the parameter.

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 clearly states the tool's action ('compare') and resource ('a package's versions and repositories') with a specific scope ('across distributions'). It distinguishes itself from sibling tools like get_package (which retrieves package info) and compare_distros (which compares distributions).

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 explicit guidance on when to use this tool versus alternatives. It only states what it does, leaving the agent to infer usage from the tool name. No mention of scenarios, exclusions, or prerequisites.

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