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

With no annotations, the description must carry the full behavioral burden. It usefully discloses that the call is pay-per-call at $0.005 USDC, which an agent needs for cost-awareness, but says nothing about read-only nature, latency, caching, or what assumptions the 'estimated transfer cost' makes (e.g., transfer type or default gas limit).

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?

Front-loads the core value proposition in the first clause, then adds routing and pricing details. The path strings are somewhat noisy internal routing detail, but nothing is truly wasted and it stays to a few lines.

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 single-parameter, no-output-schema tool, the description covers what the call returns (gas price and transfer cost estimate), which chains are valid, and the sibling to use for Solana. Minor gap: it does not clarify what the transfer-cost estimate assumes, which an agent may need to interpret the number.

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?

One parameter with 100% schema coverage and an enum that already enumerates base and polygon. The routing paths restate the enum values rather than adding new meaning such as expected units, response currency, or behavior on unsupported chains. Baseline 3 applies when the schema does the heavy lifting.

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?

States the resource precisely: current gas price plus an estimated transfer cost, and names the supported chains (base, polygon) via routing paths. It also distinguishes itself from Solana-oriented siblings by noting that Solana uses fixed micro-lamport fees. The verb is only implied rather than stated, but the intent is unambiguous.

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?

Gives a clear exclusion: for Solana, gas does not apply because fees are fixed micro-lamports, so the agent should use health for fee context instead. No guidance is offered on when to prefer this over other non-Solana siblings, but the main routing decision is covered.

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