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

With no annotations, the description carries the full burden and does well: it discloses the $0.01 USDC cost on Base via x402 payment, that results are unvetted and often spam, and that liquidity is only reported 'where readable' (i.e., partial data). It does not mention rate limits or failure modes, which keeps it from a 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 compact sentences, front-loaded with what the tool returns, followed by the spam caveat and the price. Dense but every clause (DEX list, field list, spam warning, cost) contributes information an agent needs.

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?

There is no output schema, and the description compensates by enumerating the returned fields, so an agent knows the shape of the response. The payment requirement and data-quality caveat are also covered; only pagination/ordering detail (though 'newest first' exists in schema) and rate limits are absent.

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 schema already documents both limit and minutes with ranges and defaults. The description only restates 'last N minutes' at a high level and adds no range or format detail beyond the schema, so the baseline 3 applies.

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 verb+resource (new trading pools created on OP Mainnet), the look-back window, the three DEXes covered, and the exact fields returned (both tokens with symbol/name/decimals, fee tier, v4 hooks, quote asset, liquidity). It is clearly distinguishable from sibling tools like base_new_pools or arbitrum_new_pools by chain and DEX set.

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 clear: this is a fresh-pool discovery tool for OP Mainnet, and the 'Unvetted: many new pools are spam' note warns the agent about result quality. It does not explicitly state when to prefer this over token_risk_check or the chain-specific siblings, but the chain scoping makes the alternative implicit.

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