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

Annotations already declare readOnlyHint, idempotentHint and non-destructive behaviour, so the safety profile is covered. What the description adds is a content-shape disclosure — it tells the agent the response is a step-by-step walkthrough whose steps describe 'what to do and what to look for', followed by postal-process and guide sections. With no output schema present, that is genuinely useful behavioural context.

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 sentences, front-loaded with what the tool delivers and then the internal ordering of the content. Nothing is wasted, though the closing phrase 'the guide to read' is slightly vague about what that section actually is.

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 single-parameter, read-only content-retrieval tool with no output schema, the description gives the agent enough: what the document is, how it is organised, and which metals it supports. It lacks only guidance on when to prefer this over the sibling guide endpoints.

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?

The single enum parameter is fully documented in the schema (100% coverage, with the 'Lowercase' formatting note). The description repeats the gold/silver/platinum values but adds no new semantics such as what differs between metals or whether the guide varies by choice. Baseline 3 is correct when the schema carries the parameter.

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 resource (the seller's checklist/steps for gold, silver or platinum) and enumerates its contents — weigh, photograph, quote, confirm, send. That is far more specific than a tautology. It stops short of distinguishing itself from close siblings like how_selling_works and get_guides, which an agent would plausibly confuse it with.

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 statement and no routing away from alternatives, even though the sibling list contains obvious overlaps (how_selling_works, get_guides, get_postal_pack_info, estimate_payout). The only implicit signal is 'the guide to read', which is not a selection criterion.

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