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

Annotations only declare readOnlyHint and openWorldHint=false; the description adds real behavioral detail beyond that, including plan-dependent limit capping (with the limit_applied:20 signal) and field semantics for copy_pending, copy_skipped, and null language. It stops short of describing ordering/ranking mechanics or the full response shape, so it is strong but not exhaustive.

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?

The content is dense and mostly front-loaded, but the opening 'Free, Standard and Pro: ranked current stories' buries the core action behind tier framing, and the trailing sentences read as a run-on of field notes rather than a structured order (purpose, params, output caveats).

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 five optional parameters, no output schema, and 0% schema description coverage, the definition should document coin and window to be complete. It compensates well for limit, category, and some output-field semantics, but an agent still cannot know the meaning or valid range of window or how coin filtering behaves.

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 0%, so the description carries the full burden, yet it explains only the limit parameter's plan-dependent behavior and the category values. The coin filter and the window parameter (a 5-option integer/string union) are never mentioned, and the language parameter is not explained at all – the null-language sentence describes an output field, not the input.

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?

The description states a specific resource and scope: 'ranked current stories', with an enumeration of available categories. That is clear enough to distinguish it from search or single-story retrieval, but it never explicitly contrasts itself with siblings such as get_developing, changes_since, or search_stories, leaving the agent to infer the difference.

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 statement of when to choose this tool over search_stories or get_developing, and no prerequisites or exclusions are given. The tier information ('Free: at most 20') is quota guidance, not usage guidance, so the agent gets no routing help.

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