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

Annotations already declare readOnlyHint and openWorldHint, so the safety profile is known. The description adds useful context beyond annotations: the specific RPC method, a cost of $0.01 Base USDC via Solvador, and permissive polling behavior. This is valuable despite not detailing output format or rate limits.

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 short and front-loaded, with the core purpose stated first, followed by cost/polling behavior and a disclaimer. Each sentence contributes information, though the 'Not financial advice' clause is boilerplate and less essential.

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 tool with no output schema, the description does not explain what the response looks like or how the network parameter affects the result. It also leaves the payment mechanism ('via Solvador') vague. While the tool is simple, these gaps make it incomplete for an agent deciding how to call it.

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 0%, so the description must compensate for the undocumented network parameter, but it never mentions 'network' or explains the bsc/base/both enum values. The parameter name and enum values give some inherent meaning, so it is not a complete failure, but the description adds no semantic value.

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 the resource ('latest block tip') and the RPC method used ('eth_blockNumber'), which tells an agent what the tool returns. It is not an explicit verb+resource construction, but the meaning is unambiguous. It does not name sibling alternatives, so it slightly misses differentiation.

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?

No guidance is given about when to use this tool versus alternatives such as gas or native_balance. The phrase 'sticky poll OK' hints that repeated polling is acceptable, but there are no explicit conditions or exclusions for choosing this tool.

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