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

Annotations already declare readOnlyHint=true, idempotentHint=true, and destructiveHint=false, so the safety profile is covered. The description adds value by disclosing the specific return payload (price, paid endpoint, success contract) and the free nature of the quote, going beyond annotation basics.

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?

The description is extremely concise—two sentences that front-load the core purpose and immediately list return values. Every word carries weight, and there is no irrelevant filler.

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?

The description explains the tool's purpose, return values, and free nature, which is sufficient given the rich annotations and output schema. It could have mentioned explicit alternatives or eligibility conditions, but overall it is complete for a quote tool.

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 100%, so all parameters (task, input, task_type, max_price_usdc) are already well-documented. The description references max_price_usdc implicitly ('buyer's max price') but does not add significant new parameter semantics beyond schema.

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 clearly states it provides a 'Free pre-payment quote for one ResultRail public-data result,' specifying the verb 'quote' and the resource. It also lists what is returned (price, paid endpoint, success contract, coverage check), distinguishing it from sibling tools like enrich_domain_result and extract_url_result, which focus on enrichment and extraction.

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 implies usage in the pre-payment phase ('Free pre-payment quote') and distinguishes it from enrichment/extraction by its purpose. However, it does not explicitly name alternatives or state when not to use it, so it lacks explicit exclusions.

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