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. The description adds behavioral context by stating it returns the latest full snapshot with per-issuer breakdown and specific fields (total_supply_usd, issuer, per-chain data), which goes beyond the structured annotations.

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, front-loaded with the primary purpose, and includes essential return details. Every word earns its place; there is no unnecessary filler or repetition.

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 no-input, read-only snapshot tool, the description is complete enough: it specifies scope (all tracked stablecoins) and return content (supply, issuer, per-chain data). Without an output schema, the description appropriately summarizes the return shape, though the term 'per-chain deployment data' remains somewhat vague.

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 input schema is empty, so the description has no parameter semantics to clarify. Per the baseline for zero parameters, a score of 4 is appropriate; the description still adds value by explaining what the no-param call will return.

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 uses a specific verb ('Get') and clearly identifies the resource: the latest full snapshot of all tracked stablecoins. It further specifies the per-issuer breakdown, which differentiates it from per-coin or aggregate siblings like orbuc_stablecoin_coin_latest or orbuc_stablecoin_aggregate.

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 the tool is for retrieving the latest complete snapshot of all stablecoins, and lists return fields. However, it provides no explicit guidance about when to choose this tool over alternatives (e.g., for a single stablecoin, use orbuc_stablecoin_coin_latest), and no exclusions are mentioned.

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