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

Annotations already declare a safe, idempotent read. The description adds genuine behavioral context beyond that: it clarifies the diff semantics ('reports added/changed/removed requirements without rewriting history') and a critical interpretation caveat ('Counts never prove exhaustive compliance'), which the agent cannot get from annotations alone.

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?

Three dense but front-loaded sentences; the core read behavior leads, the optional diff follows, and the compliance caveat closes. Jargon-heavy phrasing but no wasted sentences.

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 read tool whose annotations carry the safety profile and with no output schema, the description covers what is read, the revision/diff behavior, and an important semantic limitation. It is largely sufficient, missing only pagination/shape detail that limit/offset imply.

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 low (25%), with only projectId described in the schema. The description meaningfully expands the non-obvious nested previousAnalysisRevision parameter (diff output), but says nothing about limit/offset beyond what their names and bounds imply, so it only partially compensates for the coverage gap.

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 (Read) and resource (requirement coverage decomposed into source extraction, requirement, answer, proof, owner and review states) with revision links and target zones. An agent can tell it reads coverage data, but it never names or differentiates itself from close siblings like read_document_coverage or read_compliance_matrix.

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?

No explicit when-to-use, prerequisites, or alternatives are given. The only conditional guidance is that previousAnalysisRevision is optional and produces a diff; the agent is left to infer when this tool is preferable to the compliance-matrix or document-coverage readers.

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