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

Annotations already declare readOnlyHint, idempotentHint, destructiveHint=false and openWorldHint, so the safety profile is fully covered. The description adds only the domain meaning of 'capabilities' (detection content size); it says nothing extra about rate limits, auth, or day-boundary behavior that annotations don't already imply.

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?

A single front-loaded sentence naming the resource, the returned metric, and the parameter format with zero filler.

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?

With a rich annotation set, an output schema covering the return value, and a single documented parameter, the description is nearly sufficient for correct invocation. The only real gap is routing guidance between this tool and get_latest_capabilities.

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 0%, so the description carries the burden and does so reasonably: it names scan_date and supplies the required YYYY-MM-DD format, which the schema does not. It stops short of clarifying timezone or whether the date must correspond to an existing scan.

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 gives a specific verb (Get) and resource (ScanMalware's detection content size) and even enumerates the content types covered — indicators, detection rules, ClamAV signatures. The phrase 'on a given date' implicitly separates it from get_latest_capabilities, but that sibling is never named, so differentiation is inferred rather than stated.

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?

There is no explicit guidance on when to call this versus the obvious alternative get_latest_capabilities, nor any prerequisite or exclusion. Usage must be inferred entirely from the phrase 'on a given date'.

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