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

Annotations already declare readOnlyHint=true and openWorldHint=true, so the safety profile is covered. The description adds that stories are 'fresh' and come from a 'public feed,' which gives useful context about freshness and access, though it omits details like update frequency or result 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 that front-loads the key qualifiers ('Fresh,' 'top stories,' 'public feed'). Every word earns its place with no redundancy.

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?

The tool has no parameters, an output schema, and read-only annotations, so the description need not explain returns or safety. It covers the essential scope (top stories from the public feed) but could be slightly more precise about how it differs from polygon_headlines.

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?

With zero parameters, the baseline is 4. There is no parameter information needed, and the description correctly avoids discussing inputs that do not exist.

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 clearly states the resource (Polygon top stories) and scope (public feed), giving an agent a concrete picture of what the tool returns. It does not explicitly differentiate itself from sibling tools like polygon_headlines or polygon_news, which likely overlap in purpose.

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?

No when-to-use guidance or alternatives are provided. The agent is left to infer that this is the tool for fresh Polygon top stories, but there is no mention of when to prefer it over polygon_headlines or polygon_article.

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