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

Annotations already convey readOnly, idempotent, and non-destructive behavior, so the description does not need to repeat those. It adds the useful identifier nuance of 'public id' and singular result, but does not mention response shape, not-found behavior, or any other runtime details.

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?

The description is a single, tight sentence with no filler. The core operation and key detail are front-loaded and every word contributes.

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 tool with rich safety annotations, the description captures the essential invocation details. However, with no output schema and no mention of return or error behavior, an agent has some ambiguity about what to expect from the call.

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?

With 0% schema description coverage, the description carries the parameter burden. It usefully clarifies that department_id is the public identifier lookup key, but the optional request_id is left entirely unexplained, creating a partial 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?

The description names the exact operation ('Read'), the resource ('Department'), and the lookup key ('by public id'). It clearly distinguishes this from departments_list and departments_update without needing to inspect the schema.

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?

'Read one Department by public id' gives a clear context: use this when you need a single department and have its public identifier. It does not explicitly name alternatives or exclusions, but the singular 'one' and the sibling department tools make the appropriate usage evident.

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