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

With no annotations, the description must bear the burden of disclosure. It reveals the payload includes a content_hash, verify URL, and custody providers, suggesting a signed/verified artifact. However, it does not clarify what 'signed' entails, whether the data is cached or real-time, or any failure modes, leaving significant behavioral ambiguity.

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 two sentences and mostly front-loaded with substantive details (price, 24h change, RWA context, MiCA, custody, content_hash, verify URL). The second sentence is slightly promotional ('turns raw price data into enterprise-grade evidence') but not excessive, so it earns a solid 4.

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 there is no output schema and no parameters, the description does a reasonable job of enumerating the key fields in the evidence payload. It covers the most relevant elements for a gold-price evidence tool, though it could elaborate on how the verify URL and content_hash work together or how the payload should be consumed.

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 tool has zero parameters and the schema is complete (100% coverage), so the baseline is 4. The description correctly focuses on the output payload rather than input params, and 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?

The description clearly identifies the resource ('gold spot price (XAU)') and the output form ('signed reserve evidence payload'). It distinguishes itself from siblings like reserve_silver and reserve_gold_tokens by emphasizing the live spot price and the evidence-payload format, though it lacks an explicit verb such as 'retrieves' or 'returns'.

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?

It implies a use case for 'enterprise-grade evidence' but does not explicitly state when to use this tool versus alternatives like reserve_silver or reserve_gold_tokens. No exclusions or alternative paths are provided, so the guidance is merely implicit.

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