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

Annotations already declare readOnlyHint, idempotentHint, openWorldHint and destructiveHint, so the safety profile is covered. The description adds useful behavioral context that the window defaults to an API-defined value and that results include totals and grouping, but it omits pagination, rate limits, and how 'limit' interacts with the totals.

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 efficient sentence with the temporal scope and output shape front-loaded; nothing is padded. It is compact, though the parenthetical about the default window is a bit clunky.

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 explained, and annotations cover the safety profile. Still, for a 2-param tool with 0% schema description coverage, the definition should clarify the undocumented parameters and how it relates to sibling threat tools; it does not.

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% - neither 'hours' nor 'limit' has a description. The description partly compensates by implying a time window and noting the API-set default, but it never explains the meaning, bounds, or default of 'limit' (default 20). The description leaves half the parameters unexplained.

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 ('List') and resource ('malware threats detected in scans during the last hours') plus the aggregation shape ('totals and grouping by threat'). However, it does not distinguish itself from the closely related sibling get_recent_yara_threats or get_malware_stats, so an agent cannot route between them without opening schemas.

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 statement of when to use this tool versus alternatives, no exclusions, and no prerequisites. Given siblings like get_recent_yara_threats and get_malware_by_scan, an agent gets no help choosing this one.

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