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

Annotations already declare readOnly, idempotent, non-destructive and closed-world, so the safety profile is fully covered. The description adds that the result is the 'full public record' (completeness, public availability), which is useful context, but says nothing about response shape, not-found behavior, or lookup failures.

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?

One sentence, front-loaded with the resource and scope ('one study from the research library'), followed by the identifier forms. No filler and nothing redundant with the title.

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 single-parameter read tool with complete annotations and no output schema, the description covers what the tool returns ('full public record') and how to identify the target. Only the alternative-route guidance 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 100% and the schema already names the accepted identifier kinds, so the baseline is 3. The description earns an extra point by supplying a concrete example format ('pmid-40373645'), which clarifies the expected id style in a way the schema does not.

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?

Names a specific verb+resource: retrieve the full public record for one study. The identifier formats (internal id, PMID, DOI) sharpen the scope considerably. It does not explicitly differentiate itself from the sibling search_research, so it falls short of a 5.

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 description implies the triggering condition (you already have an identifier and want the complete record), but never states when to use this over search_research or what to do if the identifier is unknown. Usage is left to inference.

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