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

Annotations already declare readOnlyHint=true and openWorldHint=true, so the safety profile is covered. The description adds meaningful context beyond them: it is a public feed, the scope is the general top-story stream, and the payload is headline items. It does not mention pagination or item count limits, which keeps it short of a 5.

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?

Four short sentences, front-loaded with what the tool returns and then each remaining sentence routing to a distinct sibling. Nothing is redundant.

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?

A zero-parameter feed endpoint with an output schema describing the returned items, plus annotation coverage for safety. The description needs only to state scope and sibling routing, which it does completely.

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 zero parameters, so the baseline is 4 – there is no parameter syntax for the description to compensate for, and the schema fully describes the empty object.

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 ('GQ top stories from the public feed'), then immediately marks the boundary against gq_headlines by contrasting the general top-story stream with a section-specific list. An agent can distinguish this from gq_article, gq_author, gq_headlines and gq_sections without opening any schema.

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?

Explicit routing: gq_headlines with a section slug for sections, gq_sections to discover slugs, gq_article with a returned URL for a story body. Both the when-to-use and the alternatives are named, with the condition that selects each.

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