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 nature is covered structurally. The description adds only that the cards are 'current' and scoped to a single section; it says nothing about pagination, rate limits, or freshness windows. With annotations carrying the safety profile, a minimal add 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?

One sentence, no filler, with the resource and the section-scoping condition front-loaded before the prerequisite slug detail. Every clause earns its place.

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?

With an output schema present, the description need not explain return values, and it covers the sole input's provenance. It is close to complete for this low-complexity, one-parameter tool, with only the lack of sibling routing preventing a 5.

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 section property already documents a long list of valid slugs, so the schema does the heavy lifting. The description reinforces the slug origin (denverpost_sections) but adds no syntax or format detail beyond the schema, matching the baseline 3 for a single 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 (Fetch), resource (Denver Post article cards), and scope (one editorial section or topic archive). It clearly separates a section-scoped headline listing from the sibling denverpost_sections tool that produces the slug, though it does not explicitly contrast itself with denverpost_news or denverpost_article.

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: the section value must be a slug returned by denverpost_sections, which routes the agent through the correct upstream tool. It does not state when to prefer this over denverpost_news or denverpost_article, so it falls short of full when/when-not guidance.

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