getBeaconStateValidatorBalances

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

No annotations are provided, so the description carries full burden. It only states the basic operation, lacking details on rate limits, pagination, balance units (ETH/gwei), or other behavioral traits expected for a data retrieval tool.

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 a single, concise 14-word sentence that front-loads the verb and resource. Every word is essential, making it highly efficient.

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?

The description adequately explains the core function but omits details about the return format, pagination, or how stateId values map to actual states. Given the tool's complexity and lack of output schema, it leaves gaps for the agent.

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 provides descriptions for all three parameters (100% coverage), including defaults and valid values. The description adds minimal extra meaning beyond confirming the filtering option. Baseline score of 3 is appropriate.

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 tool retrieves validator ETH balances for a given state, with optional filtering by validator ID. This distinguishes it from sibling tools like getBeaconStateValidators and getBeaconStateValidatorById, which likely return more comprehensive data.

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 implies usage for balance queries but does not explicitly state when to use this tool over alternatives or provide exclusion criteria. Given the large set of sibling tools, more guidance would be beneficial.

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