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

Annotations already declare readOnlyHint, idempotentHint, openWorldHint and destructiveHint=false, so the safety profile is covered. The description adds useful analytic framing about what the prevalence numbers mean, but says nothing about volume, cost, or output shape beyond what annotations and the output schema provide.

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, no waste: the analytical value is front-loaded and the parameter note is compact. Every clause earns its place.

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 single-parameter, read-only tool with an output schema, the description covers what the tool produces and the meaning of the input. Return values need not be explained since an output schema exists; only explicit routing to alternatives is missing.

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 description coverage is 0%, so the description must carry the burden, and it does clarify that scan_id is the UUID of a ScanMalware scan. That is meaningful type/format information absent from the schema, though it stops short of format examples or failure behavior for invalid IDs.

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 and resource: for each script in one scan, report hash prevalence across the archive, plus the interpretive purpose (distinguishing common libraries from rare page-specific code). This is clear and distinguishable from stats-style siblings like get_jsfingerprint_library_stats, 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?

Scope is implied by 'in one scan' and the scan_id requirement, so an agent knows the input context. However, there is no explicit when-to-use versus alternatives (e.g., get_jsfingerprint_library_stats or get_jsfingerprint_bundle_stats) and no exclusions or prerequisites stated.

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