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

With no annotations, the description carries the full burden of behavioral disclosure. It states that the operation returns a spot price and is free, which gives some context, but it does not mention response format, rate limits, authentication, or what happens when no match is found. These gaps prevent a higher score.

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 short sentences with no filler. The core purpose is front-loaded, and 'Free' earns its place as relevant cost information.

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 simple price lookup, the description covers the main input types and the output currency, but there is no output schema and no annotations. It omits details like whether one of the two parameters is required, expected response shape, or behavior in error cases, making it minimally adequate rather than complete.

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 description coverage is 100%, so the schema already documents both parameters. The description paraphrases the parameter roles by mentioning 'contract address or CoinGecko id' but does not add meaningful semantics beyond that, such as whether exactly one is required or what happens if both are supplied.

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 (ERC-20 token) and the output (spot price in USD), and it names the two input identifiers (contract address or CoinGecko id). It does not explicitly contrast itself with sibling tools, but its purpose is unambiguous and distinguishable from the provided siblings.

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 instead of alternatives, no exclusions, and no prerequisites. The word 'Free' hints at a cost advantage but does not reference any sibling tool or decision rule.

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