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

Annotations already declare readOnlyHint=true and openWorldHint=true, so the agent knows this is a safe public read. The description adds the valid-value-source constraint, but says nothing about freshness window, ordering, pagination, or volume of headlines returned.

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?

One compact sentence with zero filler; the core purpose leads and the dependency constraint follows. Every clause carries 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 explained, and the key input dependency is covered. For a single-parameter read tool this is nearly complete, missing only freshness/ordering expectations.

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 single 'section' parameter has 0% schema description coverage, a bare string with no enum, so the description must compensate. It does usefully state the value must originate from huffpost_sections and that exactly one section is allowed, but gives no format or example values.

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+resource ('Current HuffPost headlines') with scope ('one public section'), which distinguishes it from huffpost_article and huffpost_news. It doesn't explicitly contrast itself with the sibling huffpost_news, so it falls 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?

Explicitly routes the agent: the section value must come from huffpost_sections, which is real when-to-use guidance and prevents an invalid call. No when-not or exclusion criteria are given.

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