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

Annotations already declare readOnlyHint and idempotentHint, and the description aligns with those. It adds useful behavioral context beyond annotations by explaining the two exact checks (mutability role and rename history), the impersonation/bait-and-switch risk, and operational details like pricing and lack of API key requirement. No contradiction exists.

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 reasonably sized but includes a rhetorical question and explanatory framing that add length without functional content. The core behavior is present and clear, but pricing and operational details could be separated or streamlined. It is structured acceptably, but not every sentence earns its place.

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?

With a single required parameter fully documented, an output schema present, and annotations covering safety, the description provides sufficient operational context: what is checked, required input, chain (Base), pricing, and authentication. Since an output schema exists, return values need not be explained. It misses explicit usage guidance, already penalized separately.

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 input schema fully documents the only parameter as 'B20 token address,' giving 100% schema coverage. The description merely repeats that address is required and does not add format, constraints, or examples. This matches the baseline of 3 for high schema coverage.

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 read operation: checking whether B20 metadata is mutable (a METADATA_ROLE holder exists) and whether the token has already been renamed on-chain. This distinguishes it from many b20_* siblings by topic, though it does not explicitly name an alternative tool, so it falls short of the top bar.

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?

There is no explicit guidance on when to use this tool versus alternatives. The description says what it reads and gives operational details, but an agent must infer the appropriate use case from context. No exclusions or alternative tool names are provided.

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