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

Far exceeds annotations by disclosing payment mechanics ($0.04 per call over x402 on Base, prepaid x-credit-token header for unlimited calls, no free tier, no API key), the METADATA_ROLE capability (updateName/updateSymbol), and exactly what on-chain history it inspects. Annotations only cover read-only/idempotent/open-world safety.

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?

Front-loaded with the key question and answer, then flows into mechanics, guidance, and pricing. It is fairly long, but most sentences carry distinct information; only the explanatory aside about ERC-20 having no equivalent is slightly padding.

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?

Complete for a read-only, single-address tool with an output schema. The description states what is checked (mutability and rename history), the required input, and the payment/auth model, so an agent has enough to invoke it correctly.

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 coverage is 100% and the only parameter is already documented as 'B20 token address'; the description's 'Required input: address' adds no syntax, format, or validation detail beyond the schema. Baseline 3 applies when the schema does the parameter documentation.

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?

States a specific read operation on B20 token metadata: mutability via METADATA_ROLE and rename history via NameUpdated/SymbolUpdated. The opening questions make the purpose concrete, but it never names or contrasts with sibling tools such as b20_authenticity or b20_info, so sibling differentiation is missing.

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?

Provides clear context for engagement—checking whether a B20 token can or has renamed itself to detect impersonation/bait-and-switch—and advises 'Trust the address, not the label.' However, it does not give explicit when-not conditions or route the agent to alternative tools.

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