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

No annotations exist, so the description carries the burden; it discloses the return payload in detail (aliases, capabilities, family, threat actors, ATT&CK techniques, related vulnerabilities, trending activity) and the prerequisite of resolving an exact identifier. It does not mention auth requirements, error behavior for unknown identifiers, or whether results are cached/rate limited, which keeps it below a 5.

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-loaded with the action and identifier, followed by return contents, then escalation guidance — a sensible ordering. The return-field enumeration is somewhat long but each item is informative rather than 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 no output schema, the description compensates by enumerating return fields, and it covers the identifier prerequisite and alternatives. Minor gaps remain around failure modes (unknown identifier) and read-only/safety characterization, which annotations would otherwise supply.

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 100% and the single parameter already documents both accepted forms (UUID or family name such as 'Cobalt Strike'). The description restates the same constraint without adding format examples, case-sensitivity, or ambiguity handling, so the baseline of 3 applies.

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 ('Fetch'), resource ('a single Mallory malware'), and scope ('by identifier') plus the detail level returned. It is clearly distinguishable from listMalware (search) and queryApi (pivots), both 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?

Explicit routing: 'If you only have a name or search terms, call listMalware first to find the exact identifier' and 'For relationship pivots ... and advanced cross-entity queries, use queryApi.' Both the when and the when-not with named alternatives are covered.

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