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

Annotations already declare readOnlyHint and openWorldHint, so the safety profile is covered. The description adds that headlines are 'current' and tied to 'one public section', but says nothing about recency windows, result limits, or ordering that would meaningfully extend the annotations.

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 with the resource named first and the section dependency second. No filler, though it is terse enough to leave some questions unaddressed.

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 annotations cover the read-only open-world nature. Combined with the full schema coverage, the definition is nearly complete for a single-param headlines lookup, missing only recency/count details.

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 enum-like value list is fully documented in the schema, so it already does the heavy lifting. The description adds the useful constraint that section values must originate from gizmodo_sections, which is slightly beyond the schema, so baseline 3 is appropriate.

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 states a specific verb+resource ('current Gizmodo headlines') and scopes it to a single public section. It clearly identifies what the tool returns, though it does not explicitly differentiate itself from the sibling gizmodo_news beyond the section constraint.

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 gizmodo_sections' gives an explicit dependency and effectively routes the agent to the correct sibling before calling this tool. It lacks a 'when not to use' statement or comparison against gizmodo_news, but the conditioning is clear.

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