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

Annotations already declare readOnly/idempotent/non-destructive/openWorld, so safety is covered. The description adds genuine behavioral context beyond them: it is a price estimate rather than an executable quote, and it deliberately does not split amounts or route through other pairs. It omits auth/rate-limit details, but those are minor here.

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 purpose, then clearly delimited 'When to use', 'Prefer another tool', and 'Example' segments. Every sentence carries weight, though the block is on the longer side for a four-parameter read tool.

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, return values need no explanation, and annotations cover the safety profile. The description supplies the venue-comparison intent, the non-routing caveat, an alternative tool, and a concrete call example, leaving nothing essential for correct invocation.

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 base/quote/amount/depth are fully documented in the schema, establishing the baseline of 3. The description's example illustrates base/quote/amount usage but adds no format or semantic detail beyond the schema, and the depth parameter goes unmentioned.

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 (estimate) and resource (slippage and average price for buying an amount of base currency) with the exact scope. An agent can distinguish it from xrpl_orderbook, xrpl_amm, and xrpl_paths without opening a schema.

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?

Explicitly says when to use (before a market-style trade, to compare CLOB vs AMM depth) and when not (it is an estimate, not a quote; does not split or route across venues), and names a concrete alternative ('use the amm page'). This is exactly the routing guidance an agent needs.

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