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 goes beyond the schema by stating the output format (one plain sentence plus details) and the pricing/payment model ($0.003 per call over x402), which is valuable context. It does not, however, mention read-only status, idempotency, or rate limits, leaving some behavioral traits unstated.

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 extremely concise: three short sentences that front-load the purpose, then summarize outputs and cost. Every sentence earns its place with no filler, making it easy for an agent to parse quickly.

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 the absence of an output schema and annotations, the description provides a useful summary of return values (plain sentence, function, token movements, gas in USD) and the payment model. It is nearly complete for a paid transaction-explanation tool, though it could mention error handling or re-query behavior for completeness.

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 all three parameters in detail. The description mentions x402 payment implicitly through pricing but adds no syntax, format, or semantic clarification beyond what the schema provides. Baseline 3 is appropriate when the schema does the heavy lifting.

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 states a specific verb and resource: explaining what a Base or Arc transaction did. It scopes the tool to two chains and lists the outputs (plain sentence, function, token movements, gas in USD). However, it does not explicitly differentiate this tool from any of the many sibling tools, which is what a 5 would require.

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 offers no explicit when-to-use or when-not-to-use guidance, nor does it name alternative tools for related tasks. It implies the tool is for explaining transactions on Base or Arc, but that is left to inference rather than stated as a usage condition.

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