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

Annotations already cover the safety profile (readOnly, idempotent, non-destructive, openWorld), so the bar is lower. The description still adds real behavior: results are the full cross-outlet/cross-language set for one event and are ordered newest first, plus the 'st_…' identifier convention. It omits any pagination or size limits.

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 compact sentence with the key concept front-loaded and the ID parenthetical placed where it helps most. No filler, though the parenthetical slightly interrupts the main clause.

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?

No output schema exists, so the description must convey the return shape, and it does: items from all outlets/languages for one event, newest first. Missing only edge-case detail such as empty results, limits, or whether a story can span unrelated events.

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 0%, so the description must carry parameter meaning. It explains that `story` is the story id found on items with the 'st_…' prefix, which is genuinely useful, but says nothing about `format` beyond the enum already in the schema. Partial compensation for a two-parameter tool.

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 resource and scope: every item in a story, all outlets and languages covering the same event. An agent can distinguish it from list_stories and get_news_item by its grouping semantics. It does not, however, name or contrast with those siblings explicitly.

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?

There is no when-to-use guidance, no prerequisites, and no named alternative (e.g. list_stories vs. search_news). Usage is only implied by the 'get a group' semantics and the ID-prefix hint.

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