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 the constraint that only one public section is served per call, but says nothing about freshness window, result count, or pagination. Notes that an output schema exists, so return shape need not be described.

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 sentence that front-loads the resource and appends the critical dependency, with no filler. Every clause carries information an agent needs before calling.

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?

For a one-parameter read tool with annotations and an output schema, the description covers scope, the single-section constraint, and the upstream dependency. It omits how results are ordered or how many headlines are returned, which the output schema likely addresses.

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 all documented slug values, so the parameter is fully documented structurally. The description only adds that exactly one section may be supplied and that it must be a public one, which is a marginal gain over the schema; baseline 3 applies.

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 ('Nation Africa headlines') and scope ('one public section'), which is enough for an agent to know this returns a per-section headline list rather than the broader feed. It does not explicitly differentiate itself from siblings like nationafrica_news or nationafrica_article, so it stops 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?

Gives a concrete prerequisite that also functions as workflow guidance: the section value 'must come from nationafrica_sections', telling the agent to call the sections tool first. It offers no exclusion against nationafrica_news, so it is clear context without alternative routing.

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