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

Annotations already declare readOnlyHint, idempotentHint, destructiveHint=false, so the safety profile is covered. The description adds real behavioral value beyond that: result ordering ('newest first') and the pagination contract ('Pass the returned next_cursor back as cursor to fetch older items'), which is the kind of end-to-end mechanic annotations cannot express.

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 tight sentences with zero filler. The core behavior (what is returned, in what order) is front-loaded, and the pagination instruction follows immediately; 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?

For a read-only, filterable list tool with full parameter documentation and no output schema, this covers what an agent needs to call it correctly, including how to page. The only remaining gap is sibling disambiguation against search_news and get_feed_stats, which is not addressed here.

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%, so the baseline is 3 and the schema already documents limit, since, source, vertical and event_type. The description still earns above baseline by explaining the cursor round-trip — that the returned next_cursor is the value to feed back — which the schema's own 'next_cursor from a previous call' only half-states.

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 and resource — 'Most recent AI news items, newest first' — plus the fact that filters are optional. It's clear what the tool returns and in what order, but it never contrasts itself with the sibling search_news, so an agent must infer that this is the browsing/latest tool versus the query tool.

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?

The phrase 'with optional filters' implies a browse-style listing, and the cursor sentence gives concrete invocation guidance for paging. However, there is no explicit when-to-use-this-instead-of-search_news guidance and no stated exclusions, leaving the choice between siblings to inference.

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