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

Annotations already declare readOnlyHint, idempotentHint, non-destructive and openWorld=false, so the safety profile is covered. The description adds the result ordering (newest first) and the notion of 'compiled lists', but says nothing about pagination, how many results to expect, or the default limit behavior.

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 sentences, no filler, and the core behavior (newest warnings, newest first) is front-loaded before the optional filters. Every clause earns its place.

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?

There is no output schema, so the description should ideally hint at what a warning record contains and how many are returned by default, neither of which is stated. It is adequate for invoking the tool correctly but leaves the result shape to inference.

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 0%, so the description carries the burden: it explains that regulator is a code sourced from list_sources and that country is an ISO 2-letter code, with six concrete examples. The third parameter, limit, is left entirely to the schema, so the compensation is partial but real.

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 resource (newest warnings added to the compiled lists) and ordering (newest first), which is unambiguous. It cross-references list_sources for regulator codes, giving some differentiation from siblings, but never contrasts itself with check_name or check_website, which also deal with regulators.

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 description implies when to use the filters (optionally by regulator or country) and points to list_sources as the place to obtain regulator codes, which is a useful routing hint. However, there is no explicit statement of when this tool is preferred over check_name/check_website or when filtering is required.

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