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

The annotations already establish this as a safe, read-only, sandboxed operation, so the safety burden is covered. The description adds only the return shape ('格式化后的引文') and an alias list, and does not say what happens with unparseable or missing metadata, nor why mla/chicago appear in the schema but not in the USE WHEN list.

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 pipe-delimited, front-loaded layout puts the trigger condition and capability in the first clause, which reads well. The ALIASES segment is largely keyword padding that does not help an agent decide when or how to call the tool.

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 simple two-parameter, single-purpose transformation with annotations covering the safety profile, the description supplies enough to call it correctly. The main missing piece is any note on expected reference format or failure behavior, which is minor here.

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 the schema already documents both the 'style' string and the 'references' array, and the baseline is 3. The description's mention of three style values adds nothing the schema does not already contain, and it does not clarify format expectations for the reference strings.

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 specific verb+resource combination (reformat references) and enumerates the target styles (Vancouver / APA / GB-T 7714), so the agent knows exactly what transformation is performed. It does not differentiate from the nearby sibling citation_verify, which is the only real gap.

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 explicit 'USE WHEN: reformat references to ...' line gives a concrete trigger condition, which is stronger than most definitions provide. It stops short of exclusions or pointing to alternatives (e.g. 'use citation_verify to check that a reference is real'), so it is not a full 5.

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