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

Annotations already declare readOnly, idempotent, openWorld and non-destructive, so the safety profile is covered. The description adds genuinely new behavioral context beyond the annotations: a cost/quota model (free within the daily allowance, then $0.002 USDC per call via x402), which is valuable for invocation planning.

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 short, front-loaded sentences with no waste. It is efficient, though almost too terse to carry the usage guidance a fresh agent might want.

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 trivial single-param lookup with a full output schema and complete annotations, the description covers the identity, scope, and cost model. Nothing critical for correct invocation is missing, though routing guidance versus the search siblings would round it out.

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?

Only one parameter with 100% schema coverage, where the schema already documents the accepted 'OpenAlex id or orcid:…' format. The description restates the accepted id types but adds no syntax or format detail beyond the schema, so the baseline 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: fetch 'One researcher by OpenAlex id or ORCID'. The singular 'One researcher' implicitly distinguishes it from the plural sibling scholarly__authors-search, though it never names that sibling explicitly.

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 explicit when-to-use guidance or named alternative. The singular phrasing weakly implies a direct-lookup use case versus the search siblings, but the agent must infer when to pick this tool over scholarly__authors-search or scholarly__autocomplete.

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