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

With no annotations, the description carries the transparency burden. It discloses that the output is signed, includes a content_hash and verify URL, and contains price, 24h change, and MiCA context, giving a good sense of output behavior. It does not cover potential side effects, but this is a read-only, zero-param tool and the disclosure is adequate.

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 concise sentences front-load the main purpose and then enumerate the key output fields. Every word earns its place with no redundancy or 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?

For a zero-input tool without an output schema, the description is reasonably complete. It lists the included data fields and signing/verification elements, which is enough to understand the tool's scope. It could clarify the exact response structure but is not critically incomplete.

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 input schema has zero parameters, so schema coverage is effectively 100%. The description's parameter burden is minimal, and the baseline 4 applies because no additional parameter semantics are needed.

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?

Description clearly identifies the tool as providing live silver spot price (XAG) as a signed reserve evidence payload. It names the specific resource (silver) and distinguishes it from sibling tools like reserve_gold by explicitly stating XAG.

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?

Usage is implied: use this tool when you need the live silver spot price with reserve evidence details. No explicit when-not-to-use or comparison to alternatives such as reserve_gold or reserve_metals is provided, but the resource specificity is sufficient for basic selection.

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