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

With no annotations, the description carries the full behavioral burden and does well: it discloses the refusal condition (DANGER/BLOCK), that it does not execute the trade (you use your own wallet), that the result is a handle/certification rather than principal authorization, and that maxSlippageBps is pre-committed. It omits auth/pricing/rate-limit or latency context, so it falls short of 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?

Front-loaded with purpose, then sequencing, then refusal semantics, then a scoping disclaimer; every sentence carries information. It is dense and slightly long, with a few parenthetical return-field enumerations that could be trimmed, but nothing is filler.

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 9-parameter mutation-adjacent tool with no output schema, the description compensates by enumerating what the handle returns (preTradeUid, requestHash, CAIP-19 ids, certified price, maxSlippageBps, participant counts, signing time) and by specifying the refusal path and next tool. Missing only auth/prerequisite context, which keeps it from a 5.

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 89% so the schema already documents most parameters (asset, destinationAsset, chainId, action enum, tradeAmountUsd). The description adds value beyond the schema by framing maxSlippageBps as a pre-committed tolerance and by explaining that the returned handle contains requestHash and certified price, tying parameters to the certification concept.

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 and resource: obtain oracle assessment evidence (an execution certification handle) for a swap/DeFi intent before trading. It distinguishes itself from siblings by naming execution_receipt as the downstream step and by positioning itself as evidence rather than authorization, so an agent can separate it from pre_trade_safety_check and verify_execution_pair.

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?

Explicit when-to-use (before executing a trade), explicit sequencing (call this first, execute with your own wallet, then call execution_receipt with the handle plus txHash), and explicit failure handling (refuses on DANGER/BLOCK, do not trade). This is a full lifecycle instruction rather than a vague hint.

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