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

With no annotations, the description carries the full behavioral burden. It does disclose the authoritative source (FSC announcement) and the scope of records, which is genuinely useful, but it says nothing about data freshness, whether the list is exhaustive, or how the fee figures are sourced or dated.

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?

A single sentence, bracketed domain tag first, then resource and returned fields — fully front-loaded with no filler. The trailing mention of platform fees is slightly tangential but still part of the payload.

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 zero-parameter listing tool with no output schema, the description does the necessary work by naming the data source and enumerating the returned fields. Only the currency/format of the fee figures and the list's update cadence are left unstated.

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 there are no parameter semantics to document; baseline 4 applies. Nothing in the description misleads about inputs.

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 ('列出' / list) and a precise resource (VASPs that have completed AML registration per Taiwan's FSC), and enumerates the fields returned (company, tax ID, brand, service type, platform fees). No sibling in the crypto group covers registered-VASP data, so it is easy to place, though it does not explicitly name what it is not.

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?

Usage is only implied: an agent can infer this is the tool for looking up which Taiwanese crypto exchanges are legally registered. There is no explicit when-to-use, no exclusion, and no pointer to a sibling (e.g. check_scam_domain or get_usdt_twd_premium) for the adjacent questions a user might actually have.

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