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

The annotations already declare readOnlyHint, idempotentHint, non-destructive and closed-world, so the safety profile is covered. The description adds genuine context beyond that: the data comes from a 'live rules table' and each record carries an effective date, official source URL and confidence value. It does not say what happens for an unsupported track or how fresh the 'live' data is.

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, front-loaded with the resource and the returned fields, with no filler. The only waste is the enumerated track list, which duplicates the schema enum instead of adding explanation.

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, and the description does the work of describing the return payload (thresholds, effective date, source URL, confidence), which is the main thing an agent needs. Remaining gaps are minor: currency/units for money and fees, and behavior on an invalid track.

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%, but the single parameter is an enum that already constrains the accepted values. The description's trailing track list merely restates that enum verbatim rather than explaining what acronyms such as 'dtv', 'o-a-visa', 'ltr-visa' or 'thailand-privilege' mean, so it adds almost no meaning 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?

The description gives a specific verb and resource: it returns 'current thresholds for a Thai long-stay visa' with named fields (money, age, income, fees, stay length) for a given track. That is clear enough to distinguish it from check_visa_eligibility, but the differentiation is left implicit; no sibling is named.

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 it should call this to look up rule values before assessing eligibility. There is no explicit when-to-use or when-not-to-use guidance, and no routing between this tool and the closely related check_visa_eligibility or list_rule_changes siblings.

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