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

Annotations already declare readOnlyHint=true, destructiveHint=false and a closed world, and an output schema exists, so the safety and return-shape burden is largely covered. The description adds one useful behavioral detail — that results include a page describing each template plus a direct .xlsx link — but says nothing about result count, freshness, or whether templates can be missing for some categories.

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 usage trigger and followed by the return shape. Every clause earns its place, including the enumerated template categories that help an agent match user intent.

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 zero-parameter, read-only listing tool with annotations and an output schema already present, the description supplies exactly what is needed: the trigger condition, the domain categories, and what the results contain. No material gap remains 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?

The tool takes zero parameters, so the baseline is 4. The description correctly implies no filtering or selection input is needed, though it does not explicitly state that all templates are always returned unfiltered.

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+resource (list spreadsheet templates) and qualifies the scope as blank, hand-filled Excel templates. It implicitly separates itself from create_invoice_spreadsheet by emphasizing 'blank template to fill in by hand' rather than generated invoices, though no sibling is named explicitly.

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?

Gives an explicit trigger condition ('Use this when the user wants a blank Excel template to fill in by hand') and enumerates the concrete use cases: invoices, expenses, landlord accounts, CIS deductions, construction and development costs. It lacks any when-not or named alternative, so it stops short of the top band.

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