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

Annotations already declare readOnlyHint=true, so the safe-read profile is covered. The description adds only the GET endpoint and returned fields; it does not disclose pagination details, permissions, or rate limits. With annotations carrying the safety burden, a 3 is appropriate for the modest added context.

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?

One short line that front-loads the resource and lists the return fields; no wasted words. The endpoint is a compact implementation hint.

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 simple read-only list tool with full schema coverage and no output schema, the description supplies the key return fields and endpoint. Pagination/total-count behavior is covered by the schema parameter, so the definition is largely complete, though it could explicitly state that it lists all departments.

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 max_results parameter is fully documented in the schema, so the description need not repeat it. Baseline 3 applies when the schema does the heavy lifting.

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 the resource (departments) and the fields returned (code, name, active flag), plus the endpoint. However, it lacks an action verb and relies on the tool name/title to convey 'list', giving no sibling differentiation beyond the unique resource name. Adequate but minimal.

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 when-to-use guidance, no alternatives, no exclusions. The agent must infer from the tool name that this is the tool for listing departments rather than any other entity.

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