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

Annotations already declare readOnlyHint, idempotentHint, destructiveHint=false and openWorldHint, so the safety profile is covered. The description adds one genuinely useful behavioral detail the annotations lack: results are scoped to packs the caller owns. It says nothing about result size, pagination, or ordering.

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 short sentence carrying verb, resource, and both scope qualifiers with zero filler. Front-loaded and fully earned.

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 list tool whose annotations cover safety and idempotency, the description is close to complete; the ownership scoping is the key bit an agent needs. Missing only return-shape/pagination context, and there is no output schema to cover it.

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% for the single param projectId, so the description must compensate. Saying the listing is 'optionally within a project' does convey that projectId is optional and acts as a scope filter, which is real added meaning, but no format or expected value is given.

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 (List) and resource (UI Packs) plus scope (owned, optionally by project), which is enough to distinguish it from get_ui_pack and list_ui_fonts. It stops short of explicitly naming those siblings but the resource noun is unambiguous.

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 'owned' qualifier and 'optionally within a project' hint at when to use it, but there is no explicit when-to-use/when-not guidance and no reference to alternatives like get_ui_pack for a single pack. Usage is implied rather than stated.

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