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

With no annotations, the description must carry the behavioral burden. It adds useful context by naming GeckoTerminal as the source and disclosing the 5 free trial calls per signed wallet. However, it does not clarify whether a wallet signature is required for every call, whether the tool is read-only, or what happens after the free trial expires.

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 one short, front-loaded sentence followed by a relevant trial-call note. There is no filler, and every element contributes to understanding the tool's basic purpose and usage 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?

The tool has five optional, loosely-defined parameters, no output schema, and no annotations, yet the description does not explain how to specify a token (by symbol, address, or chain), whether parameters can be combined, or what the response contains. The agent is left without enough information to invoke the tool correctly.

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 100%, so the baseline is 3 even though the field descriptions are generic ('Chain to process', 'Token to process'). The tool description itself adds no information about which parameters are necessary to identify a token, whether symbol or address is preferred, or how chain and network relate, so it neither improves nor worsens the baseline.

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 fetches a token price from GeckoTerminal, naming both the action and the data source. This helps distinguish it from generic price tools like x402-crypto-price and x402-stock-price, though it doesn't explicitly separate it from DEX-related siblings such as x402-dex-scanner or x402-dex-depth.

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?

There is no guidance on when to use this tool versus alternatives. With many price-related siblings (x402-token-price, x402-crypto-price, x402-dex-depth, x402-dex-arb), the absence of any selection criteria leaves the agent to guess.

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