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

Annotations already declare readOnlyHint=true, idempotentHint=true, and destructiveHint=false, so the safety profile is covered. The description adds the fact that it returns the same falsifier and watcher count as get_paper_falsifier, which is mild useful context, but it does not disclose any additional behavior beyond what annotations and the output schema already imply.

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 description is a single short sentence that states alias status and return equivalence without unnecessary filler. It is concise and front-loaded, though slightly cryptic because it assumes familiarity with get_paper_falsifier and the term 'watcher count'.

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?

The tool has only one parameter, a complete schema, an output schema, and rich annotations, so the description does not need to explain much. However, the description is not fully standalone: it points to get_paper_falsifier without defining what a falsifier or watcher count is, and there is no guidance for when fetching a falsifier is relevant among the many siblings.

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?

The input schema has 100% coverage for the single parameter arxiv_id, including acceptable forms such as bare arXiv ID, URLs, DOI, and Pith Number. The description adds no parameter-level meaning, so the baseline of 3 applies because the schema already carries the full semantic burden.

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 title states the operation: 'Get a paper's falsifier', and the description clarifies that it is an alias of get_paper_falsifier and returns the same falsifier and watcher count. This makes the resource and action reasonably clear, though it still relies on the term 'falsifier' being understood from context.

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 gives clear context by identifying the tool as an alias of get_paper_falsifier, implying it should be used whenever that sibling would be used. However, it does not explain when getting a falsifier is appropriate relative to the other sibling tools, and provides no exclusions or alternative selection guidance.

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