get_gas_premium

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

With no annotations, the description partially fulfills behavioral disclosure by stating the cost ($0.002 USDC via x402). However, it does not mention data freshness, return format (e.g., JSON structure), error handling, or whether the tool is idempotent. The cost transparency is valuable but incomplete.

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 extremely concise, consisting of two short sentences that front-load the core action ('Get full 9-chain EVM gas comparison') and immediately provide supporting details (chains, cost). Every word adds value.

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 the simplicity of the tool (no parameters, no output schema), the description covers the core inputs and output concept. However, it lacks details on the return format (e.g., data structure, units) and does not describe how this tool relates to siblings, leaving some ambiguity for agent selection.

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?

Since the input schema has zero parameters (schema coverage 100%), the description adds meaningful context not present in the schema, specifically the cost and payment method. This goes beyond the baseline of 3.

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 provides a 'full 9-chain EVM gas comparison' and lists all 9 chains, making the purpose explicit and distinguishing it from sibling tools like get_gas_basic (which likely covers fewer chains).

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 when needing a comparison across all 9 chains, but does not explicitly state when to prefer this over siblings (e.g., get_cheapest_chain or get_gas_demo) or mention exclusion criteria. The cost mention could be a guideline but is not framed as a usage condition.

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