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

Annotations already declare readOnlyHint=true and openWorldHint=true, so safety and live-data nature are covered. The description adds only modest context beyond that — 'current' implies freshness and 'one public section' implies single-section scoping. With annotations carrying the main behavioral load, a 3 is appropriate.

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 no filler; the resource, scope and the input constraint are all stated compactly.

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 tool with an output schema and annotations covering safety, the description is nearly complete. The reference to nationalpost_sections closes the main gap; only minor exclusions or freshness detail are absent.

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 section property already lists all documented slugs, so the schema does the heavy lifting. The description adds the useful pointer that valid values come from nationalpost_sections, matching the baseline 3 for a fully-documented parameter.

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 National Post headlines') and scope ('one public section'), clearly distinguishing it from nationalpost_news and nationalpost_article. An agent can identify this as the section-scoped headlines tool without opening the schema.

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?

It tells the agent the section value must come from nationalpost_sections, which routes to the right sibling for valid inputs. It gives clear usage context but no explicit when-not-to-use exclusions (e.g. when to prefer nationalpost_news over this).

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