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

Annotations already declare readOnlyHint, idempotentHint, and destructiveHint=false, so the safety profile is covered; 'READ ONLY.' largely restates it. The description adds real value beyond annotations by disclosing what is returned (full text, title, canonical URL, last-updated date), noting the date is conditional ('when the page states one'), and flagging that prices are live/current — a volatility trait not captured anywhere else.

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 tight sentences, front-loaded with the safety marker, then the return behavior, then the price caveat. No filler, no restatement of the title, and each sentence carries distinct 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?

For a single-parameter, idempotent read tool with an output schema and full annotation coverage, this is nearly sufficient; the output schema covers return structure, so the brief return summary is a bonus rather than a gap. Only the absence of any failure-mode note (e.g. unknown id or missing page) keeps it from a 5.

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 100% and the single 'id' parameter is fully documented in the schema, including the URL alternative, so the structured data already does the work. The description's only added nuance is reinforcing provenance ('the id search returned'), which is minor; 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 and resource ('Returns the full text of one Piloxa guide') and pins down the lookup key ('by the id search returned (or its URL)'), which cleanly separates it from the sibling 'search' tool. An agent can pick this tool over 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?

The description establishes the workflow context by naming 'the id search returned', making it clear this is the follow-up step to search. It gives no explicit when-not guidance or mention of other siblings like get_certified_letter_status, but the usage context is unambiguous.

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