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

Annotations already declare readOnlyHint=true and openWorldHint=false, so the safety profile is covered. The description adds genuinely new behavioral facts: a 50-call-per-caller-per-UTC-day free quota, then $0.01 USDC on Base via x402, which an agent needs before calling in bulk. It does not describe pagination behavior or what a returned publication record contains.

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, zero waste: the first covers when-to-use and scope, the second covers cross-cutting regulator coverage, ordering, and cost. Front-loaded with the selection condition, with pricing placed last where it belongs.

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 parameterless-required read-only list tool with full schema coverage and clear annotations, almost everything needed to call it is present, including cost and ordering. The remaining gap is that it never indicates what fields a returned publication carries, which matters somewhat since no output schema exists.

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%, with each parameter documented including defaults and bounds, so the baseline is 3. The description only echoes the jurisdiction filter ('optionally for one jurisdiction') and adds no interpretation of days or limit beyond the schema.

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 ('Lists the latest publications across every covered regulator'), plus ordering ('newest first') and an optional filter. The clause 'what is new from financial regulators rather than a specific topic' implicitly separates it from the topic-search sibling, so an agent can route correctly 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?

The opening 'Use when you need what is new... rather than a specific topic' gives a clear trigger condition and an implicit exclusion. It stops short of naming search_regulatory_changes or get_regulatory_change as the alternatives, which would make routing unambiguous, so it is strong but not maximal.

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