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

Annotations already declare readOnlyHint=true and openWorldHint=true, so the safe-read profile is covered. The description adds that results are 'current' and limited to a single public section, which is modest added context, but nothing about refresh cadence, ordering, or limits.

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 front-loaded sentence naming the resource and the scoping constraint, with zero filler. Every clause earns its place.

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, return values need not be explained, and for a one-parameter read tool the purpose plus the source-of-valid-values constraint is nearly sufficient. The only gap is not clarifying how it relates to the sibling news/article tools.

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 carries the burden, and it does: it constrains the lone 'section' parameter to values obtained from ninetofivemac_sections, effectively acting like an enum pointer. It still doesn't give a format example of a valid section string.

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 (headlines) and resource (9to5Mac) scoped to 'one public section', so an agent knows exactly what it returns. It does not explicitly distinguish itself from siblings like ninetofivemac_news or ninetofivemac_article, which keeps it short of a 5.

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?

'section must come from ninetofivemac_sections' gives an explicit prerequisite and the discovery tool to call first. It stops short of stating when to prefer this over ninetofivemac_news or ninetofivemac_article, so no exclusions are offered.

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