gas_price

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

No annotations are provided, so the description must cover behavior. It discloses that the call is free with a limit ('free: 5/5 today'), which is useful. However, it does not mention other traits like response format, latency, or error handling. For a parameterless tool, this is adequate but not thorough.

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 very concise at 13 words, front-loading the free nature and the resource. Every phrase adds value: it specifies the tool's purpose, free status, and usage limit. It could be slightly more structured but is 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?

Given no parameters, no output schema, and simple functionality, the description is reasonably complete. It explains the tool's purpose and key constraint (free limit). However, it omits details about output structure or how to interpret gas fees, which might be inferred but not explicitly stated.

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 has no parameters, so the description does not need to add parameter details. With 100% schema coverage (by default), the baseline is 4. The description adds no further parameter information, which 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 it is for querying Ethereum gas fees, using the verb '查询' (query) and specifying the resource '以太坊Gas费'. This distinguishes it from sibling tools like btc_price or weather, which are different domains.

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 does not explicitly state when to use this tool versus alternatives. It mentions it is free with a daily limit, but no guidance on when to prefer gas_price over other price-related tools. Usage is implied by the resource name, but not elaborated.

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