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

Annotations already declare readOnly, idempotent, openWorld, non-destructive, so the safety profile is covered. The description adds distinct context: it checks against the public Solana blockchain, requires an exact link from the owner or papers, and clarifies the verification target is the record, not the physical metal. It does not mention response format or error cases, but with annotations this is solid.

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 tightly packed sentences, front-loaded with the action and target, then the accepted link forms, then scope limitations. No 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?

Given only one parameter, full schema coverage, no output schema, and rich annotations, the description covers purpose, input requirements, and scope limits well. It could go slightly further on what a verification result looks like, but for a read-only single-input tool it is complete enough.

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%, so the link parameter is already documented. The description adds the two URL patterns as examples, which mildly reinforces the expected format beyond the schema, but the schema already carries the primary meaning. Baseline 3 is appropriate.

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?

Specific verb (checks/verifies) and resource (FiLot gold bar record) against a named target (public Solana blockchain). It also clearly delimits scope: 'It verifies the record, not the metal' and 'A serial number alone is never checked,' distinguishing it from any sibling that might deal with prices/tax.

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?

Explicitly states the required input form (owner share link or delivery check link) and explicitly rules out an alternative input (serial number alone). This tells the agent when this tool applies and what it cannot be used for.

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