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

With no annotations, the description carries the full burden, and it does disclose two meaningful traits: the free/cached nature and a concrete staleness bound (up to 6 hours), plus where live data lives. It says nothing about auth requirements, rate limits, or failure modes, so a full 4-5 is not earned.

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?

Two dense sentences with no filler; the free/cached qualifier is front-loaded and the paid alternative is deferred to the end where it belongs. Every clause carries information.

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 read-only data retrieval tool with no annotations and no output schema, the description covers what comes back (the enumerated sections), freshness (6h cache), cost model, and the paid alternative. Missing only peripheral operational detail such as auth/rate limits.

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% and the single 'section' parameter is already documented with examples (snapshot, outlook, levels, derivs, events, flows, news). The description's content list overlaps that documentation without adding format or default-value guidance, so baseline 3 is appropriate.

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 identifies a specific resource (an XRP brief) and enumerates its contents (price, regime/volatility, model outlook, liquidity levels, derivatives, events, flows, news), which goes well beyond restating the name. It also implicitly distinguishes itself from xrp_paid_endpoints via 'free, cached'. It lacks an explicit verb for what the tool does (retrieve/return), so it stops short of a 5.

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?

It gives clear context for selection: this is the free cached variant, and it names the alternative with its condition ('Live data is pay-per-call (see xrp_paid_endpoints)'). It does not spell out an explicit 'do not use this when...' rule or note any rate limits, so it is clear but not exhaustive.

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