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-only nature is covered. The description adds little beyond identifying purpose, and does not mention caching, stability of the section list, or that values map to the headlines tool's parameters.

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 short sentence with zero waste that front-loads the resource and its relationship to the consumer tool. Nothing here could be trimmed without losing information.

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 values need not be described, and the description correctly focuses on purpose. For a zero-parameter reference-list tool it is nearly complete, though explicitly stating that returned values feed theage_headlines' section parameter would close the remaining gap.

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 no parameters, so the baseline is 4. The description does add meaning by framing the output as the section values accepted by theage_headlines, which tells the agent how to use the result even though no input parameters exist.

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?

The description names a specific resource (The Age sections) and ties it to the consuming tool (theage_headlines), so an agent understands this returns the accepted section values. It lacks an explicit verb like 'list' or 'retrieve', but the resource and its role are unambiguous.

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?

By naming theage_headlines as the consumer, it implies this should be called to discover valid section values before invoking that tool. It does not explicitly state when to use it versus siblings like theage_headlines, theage_news, or theage_article, so usage is inferred rather than directed.

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