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

Annotations already declare readOnlyHint and openWorldHint, so safety is covered. The description adds genuine behavioral context beyond the annotations: the exact returned fields and the validation rule that unknown section values are rejected.

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?

Two tight sentences: the first front-loads what the tool does and returns, the second carries the only parameter guidance. No filler.

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?

With an output schema present the return values need not be restated, yet the description lists them anyway. A single required, well-documented parameter and a safe read profile mean nothing essential is missing, though the enumeration slightly duplicates structured data.

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 coverage is 100% and the schema already enumerates the valid slug values, so the baseline is 3. The description earns above baseline by telling the agent where valid values come from (foxsports_sections) and that invalid values are rejected.

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 (Fetch) and resource (FOX Sports feed) scoped to one section, and enumerates the returned fields. It references foxsports_sections as the value source, partially differentiating from the sections sibling, but does not distinguish itself from foxsports_news or foxsports_article.

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?

Guidance is limited to the parameter source ('Pass a section from foxsports_sections') and the rejection of unknown values. There is no explicit when-to-use-this-vs-alternatives, so the agent must infer it is the headlines/feed tool when a section is already known.

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