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

Annotations already cover safety (readOnly, idempotent, non-destructive, open-world), and the description adds genuinely new behavioral context: a $0.02 USDC x402 payment requirement and a 'data, not advice' disclaimer. It doesn't mention latency, caching, or failure modes when a route is unavailable.

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 payment cost is front-loaded where an agent will see it first, and every clause carries information. The sentence is long and dense, but nothing is wasted.

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?

With no output schema, the description usefully enumerates what the call returns, which is the most important gap to fill. Cost and chain scope are covered; per-chain quote limitations and behavior when no route exists are not, but that is a minor omission for a read-only quote tool.

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 coverage is 100%, so the baseline is 3; the description adds a little by tying position size to the quote and listing the supported chains inline. Most parameter meaning (mint vs 0x contract, default values, ranges) is already handled by the schema, so the added value is modest.

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 a specific action (get a live executable sell quote) on a specific resource (a token position) and enumerates the outputs (round-trip loss, price impact, route availability, warnings). It's clear and distinctive, though it never names the sibling tools (e.g., gbridge_quote) it should be distinguished from.

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 clear trigger context: use before buying or sizing a position, and it names the supported chains. It stops short of stating when-not-to-use or how it differs from gbridge_quote/gbridge_market, so routing between siblings is left partly to inference.

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