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

Annotations already declare the safe read-only, idempotent, closed-world profile, so the description is free to add what they cannot: the payload contents (methodology, limits, source links, worked examples) and the assurance 'no user records.' It adds real value, though it says nothing about failure modes for an unknown 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?

Three compact clauses: what it does, where the ID comes from, what it returns, plus one usage instruction. The retrieval action and ID source are front-loaded, and nothing is padding.

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 an output schema present, the description need not enumerate return fields; it correctly focuses on the input provenance, the no-user-records scope, and the citation obligation. An agent has everything needed to call it correctly in sequence after `search`.

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% for the single `id` parameter, so the description carries the load by explaining where the value comes from (the `search` result). That provenance is meaningful context the enum-only schema does not provide, though the exact ID format is still unspecified.

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 (a public tool reference), and pins the input's provenance to the sibling tool: 'by the ID returned from search.' An agent can distinguish this single-item read from the list/query behavior of `search` without opening either 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?

It clearly establishes the precondition for use — the ID must come from `search` — and adds a follow-up instruction ('Cite the returned canonical URL'). It does not state when not to use it or compare against `reconcile_stablecoin_records`, so it stops short of full routing guidance.

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