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

Annotations already declare readOnlyHint, idempotentHint, non-destructive and closed-world, so the safety profile is fully covered. The description adds that entries carry size, weight and extra services, which is useful content context, but says nothing about ordering, empty results, or how presets relate to shipment creation.

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 key noun phrase leads. It reads as a sentence fragment ('Your Saved Packages from Settings: ...') rather than a verb-led statement, which is a minor stylistic weakness but wastes no space.

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 zero-parameter, read-only listing tool with rich annotations and no output schema, the description gives enough about what comes back (size, weight, extra services) to call it confidently. Only a note on ordering or empty-list behavior would make it fully complete.

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 tool takes no parameters and the schema is an empty object at 100% coverage, so there is nothing for the description to disambiguate. The description correctly stays focused on output content instead of inventing parameter behavior.

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 (Saved Packages stored in Settings) and the fields returned (size, weight, extra services), which lets an agent distinguish it from siblings like list_package_types or create/update_saved_package. It never uses an explicit verb, relying on the tool name for the 'list' action, so it falls short of a full 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?

The context ('from Settings', plus what each entry holds) implies you call this when you need the user's pre-configured package presets, e.g., before creating a shipment. There is no explicit when-to-use, when-not, or pointer to alternatives such as list_package_types, so the agent must infer the boundary.

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