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

The readOnlyHint annotation already establishes this as a safe read. The description adds the concrete HTTP verb/path, reinforcing the read semantics, and discloses the returned field set, which is useful because no output schema exists. It stops short of covering error behavior (nonexistent id, permissions) or response shape beyond the field list.

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?

Two compact sentences, field list first and endpoint second, with no filler or redundancy. Every clause carries information.

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 usefully compensates by naming the returned fields. For a one-parameter read tool with readOnlyHint set, the remaining gaps (when to prefer it over search, failure modes) are modest.

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% and the single parameter already documents itself, including the hint to use accredible_search_departments. The description adds nothing about the id beyond the path template, so the baseline 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?

States a specific resource ('One department') and enumerates the fields it returns (name, description, URL, branding, meta_data), plus the underlying endpoint GET /v1/departments/{department_id}. The singular framing contrasts with the sibling accredible_search_departments, though that alternative is never named.

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 description gives no explicit condition for choosing this over accredible_search_departments; the only routing hint ('accredible_search_departments lists them') lives in the schema's parameter description, not in the tool description. An agent must infer that this is the single-record retrieval counterpart.

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