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

Annotations already declare readOnlyHint=true, destructiveHint=false, openWorldHint=false, so the safety profile is covered. The description adds genuine behavioral context beyond that: coverage is computed live from test cases, a scope with no test cases returns all zeros, and a nonexistent Jira key returns an error rather than an empty result.

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 dense paragraph with the core purpose front-loaded, followed by the jira_id mode and edge-case behavior. Every sentence carries information, though the middle clause enumerating Jira issue types is slightly over-packed.

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 correctly compensates by describing what comes back (per-folder and overall coverage, zeros for empty scope, error for unknown Jira keys) and how automation counts factor in. It stops short of describing the actual response shape or field names.

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%, so baseline is 3, but the description adds real semantics the schema doesn't carry: jira_id accepts any Jira issue type (requirement, user story, epic, ticket, bug) and zero linked cases explicitly means uncovered. folder_id and project_id get no extra detail, so it does not reach 5.

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+resource (test coverage for a project, overall and per folder) plus a second mode (requirement/traceability coverage via jira_id), and anchors it to the Test Cases screen. No sibling tool computes coverage, so the distinction is unambiguous.

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?

Gives explicit routing: pass jira_id for requirement/traceability coverage, and 'For a set of requirements, call once per Jira key' tells the agent how to batch. It lacks an explicit 'when not to use this' or named sibling alternative, keeping it short of a 5.

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