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

Annotations already declare readOnlyHint=true and openWorldHint=true, establishing this as a safe, non-mutating read. The description adds the shape of the return (authors, reviewers, takeaways, FAQs, references), which is helpful context, though it overlaps heavily with the output schema and says nothing about auth, rate limits, or caching.

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 front-loaded sentence with the verb first and an enumerated return list after the core purpose. Efficient overall, though the long field enumeration trends toward padding given an output schema exists.

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 one-parameter, read-only article-fetch tool with an output schema covering return values, the description supplies enough to call it correctly. The remaining gap is how to source the required path, which the description leaves implicit.

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% for the single 'path' parameter, so the description must compensate. 'By path' informs the agent that a path/slug identifier is expected rather than an ID or URL, which adds meaning, but no format, example, or source for the path is given.

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 ('Get') and resource ('one GoodRx Health article') with scope ('one') and lookup key ('by path'), which lets an agent distinguish it from the list-level goodrx_health_articles sibling. It doesn't explicitly name the sibling, but the singular detail-lookup framing is clear.

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 'by path' implies the tool is for retrieving a known article rather than searching, which is useful context. However, there is no explicit when-to-use/when-not guidance or mention of how to obtain the path (e.g., via a listing tool), leaving usage implicit.

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