vat_filing_calendar

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

Annotations already declare read-only, idempotent, non-destructive and closed-world, so the safety profile is covered. The description adds real substance beyond that: the AED 375,000/187,500 thresholds, the caveat that filing frequency is indicative with the FTA assigning the actual period, the 5% standard rate, and the 2026 legal amendments. It stops short of stating the output shape (though an output schema exists).

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?

Front-loads the core purpose, then thresholds, then the legal caveat. Every sentence carries information relevant to invoking the tool correctly. The legal-amendment tail is dense but defensible for a compliance tool.

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?

An output schema exists, so return values need not be described, and annotations cover safety. The description supplies thresholds, rate, and the FTA-discretion caveat an agent would need. The only gap is the slight disconnect between the 'calendar' framing and the actual registration/frequency content.

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?

With one parameter and 0% schema description coverage, the description has to compensate, and it does: 'Treats the input as taxable supplies and imports in the past 12 months' explains what annual_revenue_aed represents and the basis for evaluation. It does not disambiguate units/scope (e.g. imports-only vs combined) explicitly, keeping it below full marks.

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: 'Determine the UAE VAT registration requirement and filing frequency.' This is clearly distinguishable from siblings since no other tool covers VAT registration. Minor friction: the name references a 'calendar' yet the description covers no actual deadlines/dates, so purpose and name are slightly out of step.

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?

No explicit when-to-use statement or exclusion criteria, and no sibling is referenced (e.g. corporate_tax_estimate or einvoicing_timeline). Usage is only implied by the description of the input basis ('taxable supplies and imports in the past 12 months'). An agent can infer context but is not routed.

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