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

Annotations cover only readOnlyHint and openWorldHint, and the description adds substantial non-obvious behavior: CC0 licensing, deliberate omission of authors/ORCIDs/affiliations, anonymous source allowance, a per-successful-call price of $0.01 USDC on Base, and the x402 wallet requirement. Cost and payment prerequisites are exactly the kind of context an agent cannot infer from annotations.

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?

Front-loaded with the core action and result scope, then layered with licensing, payment, and auth constraints in three dense sentences with little waste. 'Anonymous source allowance applies' is vague enough to slightly weaken the structure, but overall it is tight.

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 what comes back (metadata, DOI, dates, citations, OA status) and covers cost, licensing, and auth prerequisites. It could say more about result ordering or pagination behavior for a capped search, but nothing critical is missing.

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% with both parameters documented ('Work search phrase', the 1-20 range with pattern), so the schema does the heavy lifting. The description restates the cap as 'up to 20' but adds no syntax, format, or query-construction guidance beyond the schema.

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 ('Search') plus resource ('OpenAlex works') and enumerates the returned fields (paper metadata, DOI, dates, citation counts, open-access status) with the result cap ('up to 20'). It does not explicitly differentiate from the sibling arxiv-papers, 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?

Usage is only implied by the OpenAlex scope; there is no explicit statement of when to choose this over arxiv-papers or the other paper-adjacent siblings, nor any exclusion criteria. The payment/auth note tells the agent it needs a wallet but not when this source is preferable.

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