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

Annotations already declare readOnlyHint=true, destructiveHint=false, idempotentHint=true and openWorldHint=false, so safety and repeatability are covered. The description adds the useful detail that output includes both extracted reference data and a pre-formatted citation, but says nothing about permissions, failure modes, or what happens with a URL input versus an id.

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 listing the returned data first and the citation capability second, with no filler. Every clause carries information.

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?

An output schema exists, so return-value explanation is optional, and the description still summarizes the payload shape. The only shortfall is the absence of any hint about how id versus URL inputs behave or what happens when a page has no sources.

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 67%: id is well documented and locale has its fallback rule spelled out, while style only has enum values. The description adds the meaning of the style parameter (APA/MLA/Chicago citation format) beyond the bare enum, but contributes nothing about default behavior or id formats, so it is a modest supplement rather than a compensation.

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 description names the exact resource (references, outbound links, image credits) and adds the citation-generation capability with named styles, so it is far from a tautology. It does not explicitly contrast itself with siblings such as fetch or related, but the resource is distinct enough that an agent can tell what it returns.

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 content listing: use it when you need a piece's references or a formatted citation. There is no statement of when to use it versus fetch/related, and no exclusions or prerequisites are given.

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