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

With no annotations, the description carries the full burden and does reasonably well: it discloses cost ('FREE'), the analysis scope (wallet-drainer patterns, fake RLUSD issuers, missing destination tags, partial payments), and the exact verdict vocabulary returned. It still omits whether the tool is purely read-only/non-custodial, whether the submitted tx is sent to an external service, or any rate limits.

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 the key differentiator ('FREE safety check') and compresses purpose, risk coverage, and output into two dense sentences with no filler. Minor density cost from the long risk enumeration, 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?

No output schema exists, so the description correctly compensates by naming the three verdict values, and it explains the risk categories it detects. Given a single required parameter and full schema coverage, an agent has nearly everything it needs; only the read-only/custody behavior and any limits are unstated.

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 all three parameters (tx, signer, max_xrp) are already documented in the schema. The description echoes the JSON-or-hex input format and adds no syntax, format, or default 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?

States a specific verb and resource (explain an XRPL transaction) plus the scope that matters: pre-signing safety analysis. The named outputs (looks_normal, review, do_not_sign) and risk classes make its function unmistakable and clearly distinct from the sibling tools (doctor, brief, paid endpoints, track record), none of which explain transactions.

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?

The phrase 'before signing it' gives clear situational context for when to reach for this tool. It does not name alternatives or state exclusions (e.g. whether it works on already-signed transactions or non-XRPL chains), so it stops short of the explicit when/when-not guidance a 5 would require.

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