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

Annotations already declare this a safe, idempotent read, so the description's job is content disclosure and it delivers: it warns the digest is unofficial and that the cited law prevails, and it specifies that effective dates and article references are included. What is missing is any note on coverage limits or how current 'latest' is, which matters for a compliance use case.

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 dense sentences with the content scope front-loaded and the legal disclaimer trailing, no filler. The parenthetical '(Compliance plan)' is cryptic and slightly muddies an otherwise tight 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?

For a single-parameter, read-only tool with complete annotations and a fully described schema, the description supplies the one thing structured fields cannot: what the returned digest contains and how authoritative it is. That is sufficient for an agent to call it correctly.

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 coverage is 100% and the country parameter is fully documented with the ISO alpha-2 pattern and examples, so the schema carries the semantics. The description adds no parameter-level information beyond the implied country scoping, making the baseline 3 correct.

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 resource precisely (a country's latest finance law) and the output form (plain-English digest) and enumerates the tax domains covered — VAT, withholding, corporate, payroll, procedure — plus effective dates and article references. That implicitly separates it from rate-lookup siblings like get_vat and get_payroll_tax, but it never names the closest sibling get_changes, so an agent must infer the boundary.

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: the parenthetical '(Compliance plan)' hints at the compliance-planning scenario, and 'latest' signals recency-oriented use. There is no explicit when-to-use, when-not-to-use, or statement of what to call instead for historical law changes (get_vat_history) or static rates.

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