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

Annotations already declare readOnlyHint, idempotentHint, destructiveHint=false and closed-world scope, so the safety profile is covered. The description adds the meaningful detail that results are scoped to one market and that status values are unclaimed/claimed/registered (values absent from the schema), but says nothing about ordering, paging, or return volume.

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 compact sentence with no filler, and the market-scoping constraint plus optional filter come first. The trailing colon-list of returned fields makes the tail slightly harder to parse, but it is efficient overall.

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?

An output schema exists, so return fields need not be enumerated (and partly duplicating them adds little), and annotations cover safety. However, for a 4-parameter list tool it leaves pagination and tool-selection guidance unaddressed, which an agent would need.

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%, so the description must carry parameter meaning, and it covers only market and status — and its status values are genuinely additive since the schema's status field is a bare anyOf string/null with no enum. It is completely silent on limit and offset, leaving pagination behavior undocumented, so it only partially compensates.

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 identifies the resource (banner cards) and scopes it to a single market with an optional status filter, so an agent can tell it lists cards rather than fetching one. It does not explicitly contrast itself with siblings like get_banner_card or list_banners, so sibling differentiation is left to the name.

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?

It notes that status filtering is optional, which hints at one usage mode, but there is no statement of when to prefer this tool over get_banner_card or list_banners, and no prerequisites or exclusions. The agent must infer routing from the tool name alone.

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