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

No annotations are provided, so the description carries the full burden. It discloses rate limiting and free access, but does not mention side effects, error behavior, or data source limitations.

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?

One concise sentence with no filler or redundancy. Includes all essential information: action, resource, scope, cost, and rate limit.

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 simple zero-parameter tool with no output schema, the description is complete: it states what is returned (gas prices), the supported chains, and a key constraint (rate limit). No critical context is missing.

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?

Tool has no parameters and the schema is empty, so there is no parameter information to clarify. The description appropriately focuses on behavior rather than inputs.

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?

Clearly states a specific verb ('Get'), a specific resource ('real-time gas prices'), and the exact scope (4 EVM chains: Ethereum, Base, Arbitrum, Optimism). The name also distinguishes it from sibling tools like get_cheapest_chain and get_gas_basic/premium.

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?

Implies usage through 'free' and 'rate limited 10/hr', suggesting a demo or lightweight tier, but does not explicitly say when to use this tool versus the get_gas_basic, get_gas_premium, or get_cheapest_chain alternatives.

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