get_vat_register

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

Annotations already cover read-only, idempotent, non-destructive, and open-world behavior. The description adds that the register is read for its saved period and that output can be inspected for period and completeness, which is useful context; however, the phrasing is ambiguous and no additional behavioral constraints such as period defaults or data availability are disclosed.

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?

One concise, front-loaded sentence with no filler. The second clause is compact but unclear ('period and complete'), which prevents a top score.

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 simple read tool with a rich output schema and strong annotations, the minimal description is mostly adequate. The main gaps are sibling differentiation and clarification of what 'complete' means; neither is fatal because the output schema can fill return-value details.

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 bears some responsibility for parameter meaning. It does echo the 'sale/purchase' split of the kind enum, but it does not explain the default behavior, how the saved period is determined, or operational implications beyond what the schema's enum and default already encode. Added value is marginal.

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 an explicit verb and resource ('Read the VAT sale/purchase register') and notes that the register is period-scoped. However, it does not distinguish itself from get_revenue_register or other read-only siblings, and the phrase 'inspect period and complete' is ambiguous about whether 'complete' is a status flag, an adjective, or an action.

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?

Offers no guidance about when to choose this tool over get_revenue_register, get_invoice, get_declaration, or other siblings. The only usage signal is the purpose statement itself; there are no exclusions, prerequisites, or conditional routing cues.

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