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

Annotations already declare readOnlyHint=true and openWorldHint=true, so safety is covered. The description adds genuinely non-structured behavior: a per-call cost of $0.006 USDC via x402, which is critical for an agent deciding whether to invoke. It omits pagination and rate-limit behavior, keeping it short of a 5.

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?

Two tightly packed sentences, front-loaded with the verb/resource and source, then coverage, then sorting, then cost. Every clause carries information and none is redundant.

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?

With no output schema, the description usefully enumerates the return fields (title, authors, year, venue, DOI, PDF link, citation count, abstract) and discloses the payment model. Missing pagination and payment/auth mechanics keep it from being fully complete, but for a 4-param read-only search tool it is close.

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 50%: sort and limit are documented, while q and from_year have no description. The description restates the sort options already in the schema and does not explain q's query syntax or from_year's filtering behavior, so it only partially compensates for the gap.

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 and resource (academic paper search) plus the underlying source (OpenAlex, 250M+ works) and enumerates the returned fields. An agent knows exactly what this tool does. It does not, however, differentiate itself from adjacent siblings such as books, research, or cite, so it stops 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?

There is no when-to-use, when-not-to-use, or alternative-tool guidance. The sort options ('relevance, most recent or most cited') describe a parameter rather than a usage condition, and are already present in the schema. Nothing tells the agent when this beats books, research, or cite.

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