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

Annotations already declare readOnly, idempotent, openWorld and non-destructive, so the safety profile is covered. The description adds genuinely new behavioral context the annotations do not: a free-sample quota, per-call pricing of $0.001 USDC via x402, and recency via last sync time.

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 tight sentences: the first front-loads the returned fields, the second covers the cost model. Nothing is redundant, though the first sentence is a bare noun list rather than an explicit action statement.

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 and zero parameters, the description does not need to explain return values or arguments. It covers purpose, freshness and pricing, leaving only explicit sibling routing unstated, which keeps it from being fully complete.

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?

The tool takes zero parameters, so per the baseline there is nothing for the description to disambiguate. The absence of parameters is consistent with a metadata/listing call and requires no further explanation.

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 the specific resource (sanctions lists that are mirrored) and enumerates exactly what metadata is returned: entry counts, list dates, last sync time. It clearly reads as a discovery/metadata tool distinct from the screening siblings (screen, screen-uk, entry), though it never explicitly labels itself as such.

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?

There is no explicit when-to-use or when-not-to-use statement and no sibling is named. However, the content (which lists are mirrored) implies the natural discovery-first usage before running a screen, giving usable but not stated guidance.

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