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

Annotations already declare readOnlyHint=true and openWorldHint=true, so the safety profile is covered; the description adds genuine value with negative scope and payment mechanics: it explicitly excludes trader net exposure, vault APY and GM market composition, and states the $0.002 USDC x402 price across Base/Solana/Arc with failed calls not charged. That said, the billing/cost disclosure is partly commercial rather than behavioral, and it says nothing about data freshness, chain coverage limits, or result size.

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?

Two tight sentences, front-loaded with the resource and its fields, followed by the exclusions and pricing. No filler. The field enumeration is slightly long but each item maps to a real output field and helps an agent judge relevance before paying for a call.

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?

An output schema exists, so the return shape need not be described, yet the description still summarizes it usefully for pre-call selection. Combined with the explicit exclusions and pricing, an agent has enough to decide and invoke. The missing piece is any statement of update cadence or how this differs from adjacent vault/pool tools.

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 tool takes zero parameters, so there is nothing to disambiguate and the baseline of 4 applies. The description correctly omits any parameter discussion.

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 names a specific resource (GMX v2 Arbitrum GLV liquidity vaults) and enumerates exactly what each record contains: vault name, vault token address, long/short collateral tokens, listed flag, listing date. It is unambiguous what domain object is being retrieved, though it never states the verb (list/retrieve) and does not contrast itself with sibling pool/yield tools like crypto_balancer_v2_pools or crypto_defillama_yields.

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 reach for this tool versus the many sibling liquidity/yield tools, and no prerequisites are given. The only usage-adjacent information is the cost line, which tells the agent a call is billed but not when a call is warranted.

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