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

Annotations already declare readOnlyHint/idempotentHint/destructiveHint, so safety is covered. The description goes further by disclosing the payload contents (methodology, limits, official source links, fictional worked examples), asserting 'no user records', and prescribing a citation action on the canonical URL — useful context beyond annotations, with no contradiction.

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?

Three short clauses, front-loaded with the action and ID provenance, followed by content summary and a concrete instruction ('Cite the returned canonical URL'). No filler sentences.

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 values need not be explained, yet the description still qualifies contents; annotations cover the safety profile; the parameter's origin is stated. Complete enough to call correctly, with only the odd single-value enum left unaddressed.

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 0%, so the description must carry the weight for the single 'id' parameter. It partially compensates by stating the ID comes from 'search', but says nothing about the lone enum value 'calls' or the ID's expected format.

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 ('Retrieve') and resource ('public tool reference by the ID returned from search'), and the provenance phrase ties it to the sibling 'search' rather than leaving it ambiguous. An agent can distinguish it from search and decode_token_call without opening any schema.

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?

The clause 'by the ID returned from search' establishes the prerequisite and sequencing (call search first), which is clear context for when this tool is used. It stops short of any explicit when-not or a named alternative, so it does not reach the top band.

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