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

Annotations already declare readOnlyHint, idempotentHint, destructiveHint=false and openWorldHint=false, so the safety profile is covered. The description adds genuine value beyond that: newest-first ordering, public-archive scope, and the fact that pagination is cursor-based via nextCursor.

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?

Two sentences, zero filler, with the resource scope front-loaded and the behavioral caveat placed last. 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 no output schema, the description correctly fills the gap by naming return fields (canonical URLs, dates, source citations, nextCursor). It is a bit thin on limit semantics and does not restate the same-locale/source constraint on cursor reuse that the schema embeds.

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 only 25%, so the description must carry more weight. It maps "language" to locale and "source" to source, and ties cursor to nextCursor, which helps, but it never explains limit's meaning or bounds, leaving one of four parameters unilluminated in both schema and description.

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 (List) and precise resources (RegusciLabs Newsroom articles and El Pulso editions) with ordering (newest first), so the agent knows exactly what is returned. It does not explicitly distinguish itself from the sibling get_latest_activity, which is the one tool an agent might plausibly confuse it with.

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?

"Filter by language and source" implies the intended filtering usage, and "This is a read-only public archive, not a live breaking-news feed" sets a boundary expectation. However, it names no alternative tool and gives no explicit when-to-use/when-not-to-use routing against get_latest_activity or search_information.

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