arc_stablecoins

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

With no annotations provided, the description carries the full burden of behavioral disclosure. It explicitly states this is a read operation ('read from the contracts') and notes it is free, which is useful cost/risk context. It also names the exact data being read, giving the agent a clear picture of what the call will do.

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 a single dense sentence that front-loads the core question, then specifies the exact data returned and the cost. Every phrase earns its place, and there is no filler or repetition of structured fields.

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 parameterless read tool, the description is complete: it states the source (contracts), the data items returned, and the cost. An agent can invoke it without needing additional context about inputs, side effects, or return structure.

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 schema description coverage is 100%, so there is no parameter ambiguity. The description still adds value by enumerating what the response will contain, which partially compensates for the lack of an output 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 identifies the resource (stablecoins on Arc) and the specific data points returned: USDC and EURC total supply, addresses, and EIP-712 signing domains. It does not explicitly contrast itself with sibling tools, but the scope is concrete enough to understand what the tool does.

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 gives no guidance on when to use this tool versus alternatives, and there is no mention of exclusions or related tools. While 'right now' implies current on-chain state, that is not enough to help an agent choose it among the many Arc-related siblings.

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