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

Annotations already declare readOnlyHint=true, destructiveHint=false and openWorldHint=false, so the safety profile is covered. The description adds little beyond that: 'RETURNS: 结构化 PICO' restates the obvious, and it does not say whether incomplete PICO elements are rejected or auto-filled, nor whether the input is echoed or expanded.

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?

The piped, label-driven layout front-loads the action and is scannable at a glance. The alias list is long relative to the payload, but it serves genuine matching purposes in a bilingual routing context rather than pure noise.

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 read-only transformation tool with one fully documented nested parameter, the definition is adequate but thin. It omits any statement about what the refined output contains or how partial PICO inputs are handled, which matters given there is no output schema to fall back on.

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 nested object is documented with a concrete example, so the schema carries the load. The description's only addition is expanding the PICO acronym into Population/Intervention/Comparator/Outcome, which is mildly useful decoding but no deeper than the schema's own example.

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?

The description states a concrete transformation ('turn a vague clinical question into a structured PICO') with the resource and output form spelled out. It implicitly distinguishes itself from design-oriented siblings like study_design_advisor, but never names one, so the boundary must be inferred from the USE WHEN clause alone.

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?

A 'USE WHEN' clause names the triggering condition (a vague clinical question needing PICO structure), which is actionable context. There is no when-not guidance and no named alternative for cases where the question is already structured or where study design help is actually wanted.

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