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

Goes well beyond the readOnlyHint/openWorldHint annotations by disclosing data provenance (GoPlus simulated buy/sell) and its key limitation that the tool performs no simulation of its own. It also discloses cost ($0.003 USDC per successful call), the x402 payment rails, and that failed calls are not charged — real behavioral context. It does not mention rate limits or failure/timeout behavior, so not a full 5.

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?

Three tight sentences: purpose and returned flags first, the provenance/limitation caveat second, pricing last. No filler, and the most decision-relevant content is front-loaded.

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 an output schema present and only two params (one required), the description covers what is needed to select and call it: source, scope, chains, native-simulation caveat, and cost. The only gap is operational detail (rate limits, error/charging edge cases) that would help an agent decide whether to retry or budget calls.

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 both the chain enum-in-prose and the 0x address format are already documented in the schema. The description's parenthetical chain list merely restates that, adding no syntax, default, or validation detail beyond the structured fields — baseline 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?

States a specific verb+resource ('Trap flags for an EVM token') and enumerates the exact checks returned (honeypot, taxes, blacklist, pausable, hidden owner, mintable, anti-whale). It implicitly separates itself from broader siblings like token_composite_safety_score or token_verdict_engine via the 'reports GoPlus's flags; runs no simulation of its own' line, but never names those siblings explicitly.

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?

Usage context is implied by the listed signals and the EVM chain set, but there is no explicit 'use this when X, use token_verdict_engine/composite_safety_score instead when Y'. No exclusions, no prerequisites beyond needing a contract address.

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