Get Modelo 418 Summary (IGIC Monthly Large Enterprises)

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

Annotations already indicate the tool is read-only, non-destructive, and idempotent. The description adds value by detailing the returned data (IGIC collected, deductible, net due, carryover) and noting that the period parameter defaults to the last month. No contradictions with annotations.

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?

The description is concise with two English sentences followed by a Spanish translation. It is front-loaded with the core purpose. The bilingual repetition slightly increases length but is justifiable for a multilingual audience.

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-only tool with one optional parameter and no output schema, the description covers the essential aspects: purpose, applicability, returned fields, and an example. It is sufficient for an agent to understand and invoke the tool 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?

The only parameter 'period' is fully described in the schema with format and default. The description complements this with an explicit example ('period=2026-04') and restates the default, adding practical guidance beyond the schema alone.

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 clearly states the tool retrieves an IGIC Modelo 418 summary for large enterprises in the Canary Islands, distinguishing it from other tax form tools (e.g., Modelo 200, 415) by specifying the form number and tax type. The title further reinforces the resource and scope.

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?

The description includes a usage condition: 'Applicable when annual turnover exceeds the grandes empresas threshold.' This provides clear context for when to use the tool. However, it does not explicitly mention alternatives or when not to use it, such as for smaller enterprises where other models might apply.

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