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

Annotations already declare readOnlyHint and openWorldHint, so the safety profile is covered. The description adds useful context by enumerating the returned sections and disclosing the audience=pets behavior that changes which page is fetched. It does not mention auth or rate limits, but for a read-only lookup that is a minor gap.

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?

Front-loaded with the core purpose, followed by the differentiation clause and the audience hint, so the most important information comes first. The long enumeration of sections is somewhat dense but earns its place by signaling return breadth.

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?

An output schema exists, so return values need not be fully spelled out, yet the description still previews content and covers the two routing cases (prices vs facts, human vs pet). Nothing an agent needs to call it correctly is missing.

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 the parameter burden. It explains audience ('Set audience=pets for the cat and dog page') well, but slug is only implied as a drug identifier with no format guidance, so only one of the two parameters is genuinely clarified.

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 ('Get a drug's GoodRx information page') and enumerates the content sections returned, making it distinguishable from sibling retrieval tools. It explicitly names the sibling it is not (goodrx_drug_prices), so an agent can route correctly without opening a schema.

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?

Gives explicit when-to-use ('medication facts rather than prices') and names the alternative (goodrx_drug_prices) with the condition that selects it. It also names goodrx_pet_medications as the source for pet drug listings, leaving little to inference.

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