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

Annotations already establish readOnlyHint=true, destructiveHint=false, and openWorldHint=false, so the safety profile is covered. The description adds real behavioral value beyond that: it discloses the exact shape of the returned artifact (the full traceability chain) plus that coverage metrics are included, which tells the agent this is a read-only aggregation rather than a raw record fetch.

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 sentence that front-loads the verb and the returned chain, then appends the coverage-metrics detail. Every clause carries information and there is no 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?

For a one-parameter, read-only aggregation with no output schema, the description conveys what comes back well enough for correct invocation. Minor gaps remain: 'coverage metrics' is undefined and 'in your scope' is left implicit rather than stated as a permission or filtering boundary.

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 100% for the single scan_id parameter, so the schema already documents the input. The description adds only the scoping notion ('a scan in your scope') and no format, id source, or constraint details beyond the schema, 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?

The description names a specific verb ('Return') and a highly specific resource (the diagram→threat→finding→control→requirement→remediation traceability matrix). The enumerated chain is distinctive enough to separate it from near neighbors like get_diagram_summary, get_code_findings, and get_framework_coverage, and 'for a scan in your scope' pins the unit of work.

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?

The phrase 'for a scan in your scope' implies the usage context (per-scan, within the caller's scope), which is useful, but there is no explicit when-to-use, when-not-to-use, or named alternative such as get_framework_coverage for compliance-style views. Usage is inferable rather than stated.

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