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

Annotations already declare readOnlyHint=true and openWorldHint=true, covering the safety profile. The description adds one useful behavioral detail, that returned slugs feed goodrx_drug_prices, but says nothing about result size, ordering, or pagination for what is presumably a full catalog listing.

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 tight sentence with the core purpose front-loaded and the output hint trailing it. Every clause earns its place; nothing is padded.

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 parameterless list tool with an output schema and read-only annotations, the definition supplies what the structured fields cannot: the brand-name scope and the slug handoff to goodrx_drug_prices. Nothing needed 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?

Zero parameters, so the baseline is 4. There are no arguments to explain, and the description correctly avoids inventing any filtering semantics.

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 ('List') and resource ('brand-name medications GoodRx features'), and its 'brand-name' qualifier implicitly scopes it away from the broader goodrx_drugs catalog. It names the downstream sibling goodrx_drug_prices, giving the agent a clear placement in the tool family.

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 clause 'results include price-page slugs for goodrx_drug_prices' implies a workflow (call this first, then use slugs with goodrx_drug_prices), which is useful context. However, it never explicitly states when to choose this over goodrx_drugs or goodrx_class, so usage is only implied.

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