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

Annotations already declare readOnlyHint=true and openWorldHint=true, so safety and external-source behavior are covered. The description adds that results are 'current' (a live, non-archived feed) and limited to a single section, which is useful but thin; nothing about ordering, freshness window, or result volume is given.

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?

One sentence with a semicolon-carried dependency, front-loading the resource and scope with no filler. Nothing wasted, though it is terse enough that the dependency clause could be slightly more explicit.

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 shape need not be described, and the annotations cover the safety profile. Given the single-parameter tool, the description plus schema plus the billboard_sections pointer is nearly complete; only ordering/freshness specifics are absent, which is minor.

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 100% and the schema itself enumerates the valid slugs, so the parameter is already fully documented. The description adds one constraint beyond the schema — that values should originate from billboard_sections — but no format or normalization detail beyond that. Baseline 3 is appropriate.

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+resource ('Current Billboard headlines') and scope ('for one public section'), so the agent knows it returns a section-scoped headline list. It does not explicitly contrast itself with the sibling billboard_news, which likely serves a broader or differently-scoped feed, so sibling differentiation is only implicit.

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?

Explicitly gives a prerequisite: 'section must come from billboard_sections.' That routes the agent to the sibling tool needed to obtain valid input, which is real usage guidance. It stops short of stating when to prefer this over billboard_news or billboard_article.

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