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

With no annotations and no output schema, the description does useful work by enumerating the returned fields, which is real behavioral disclosure. It falls short on operational behavior: nothing about not-found handling, whether history/access is required, or how much data comes back. The cost tag "[Free · 1 credit]" is also self-conflicting and leaves the agent unsure whether the call is free or costs a credit.

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 front-loaded sentence delivers the identity and the return payload with no filler, followed by a short cost tag. The bracketed cost note is the one weak element, since 'Free · 1 credit' is ambiguous rather than informative.

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 no output schema, listing the returned fields largely substitutes for a return-value spec. Remaining gaps are the lack of sibling disambiguation and any error/empty-result behavior, which keep it short of full completeness.

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% and the single parameter already documents 'UUID or arXiv id like 2401.12345'. The description repeats the same accept-two-formats fact without adding format rules, validation behavior, or examples beyond the schema, so the baseline of 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+resource ("Paper detail") with the accepted identifier forms and enumerates exactly what detail is returned (abstract, authors, venue, citations, GitHub stars, summary, benchmark rows, SOTA takes). It does not, however, distinguish itself from nearby siblings such as paper_fulltext or library_get_paper_content, so an agent must still infer which paper-detail surface to pick.

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?

Usage is only implied: 'look up a paper when you already have its UUID or arXiv id.' There is no explicit when-to-use versus paper_fulltext/library_get_paper_content, and no statement of exclusions or prerequisites beyond the identifier requirement.

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