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

Annotations already declare readOnlyHint=true and openWorldHint=true, so safety and liveness are covered. The description adds the validity constraint that the section must originate from stuff_sections, but says nothing about coverage window, pagination, or freshness beyond the word 'Current'.

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 tight sentence with a semicolon: scope first, constraint second. No filler, nothing to cut, and the operative rule is front-loaded enough to be read at a glance.

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-value explanation is unnecessary, and annotations carry the safety profile. The remaining gap is thin behavioral detail (how many headlines, whether the list refreshes or pages), but nothing essential for correct invocation is missing.

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 itself enumerates 28 valid slugs, so the description's single parameter is already fully documented. The description only reinforces the provenance requirement ('must come from stuff_sections'), which adds minimal meaning beyond the schema's documented-values list.

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 resource and scope: 'Current Stuff headlines for one public section.' An agent can distinguish it from stuff_sections (which enumerates sections) and stuff_article (single story), though the sibling stuff_news is not explicitly contrasted.

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 clause 'section must come from stuff_sections' gives an explicit prerequisite and routes the agent to the sibling tool that supplies valid values. It does not, however, state when to prefer this over stuff_news or stuff_article.

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