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

Annotations already declare readOnlyHint=true, and the description adds only the data source (openFDA drug/label endpoint), which is context rather than behavior. Nothing is said about openFDA rate limits (notably restrictive without an API key), result caps, or throttling — the kind of operational detail that would justify a higher score.

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?

Two compact clauses with zero waste; the resource and its contents are front-loaded and the data-source attribution is tacked on at the end. Nothing is redundant.

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?

Adequate for a search tool whose schema fully documents parameters and whose annotation covers safety, but with no output schema the description should say more about what a label result contains or which fields are searchable. Rate-limit and query-cost expectations are also absent.

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 100%, so all four parameters (skip, sort, limit, search) are fully documented in the schema, including Lucene query syntax and pagination limits. The description contributes nothing beyond that, so the baseline 3 applies.

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 (Search) and resource (Structured Product Labeling / openFDA drug/label) and enumerates the content scope — indications, warnings, dosage, adverse reactions, drug interactions. This content-level specificity implicitly separates it from siblings like search_drug_events and search_drug_ndc, though it never names an alternative.

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, when-not-to-use, or alternative tool is named. The reader must infer from the purpose statement that this is for label text rather than adverse events or NDC lookups; there is no routing guidance at all.

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