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

Annotations already declare readOnlyHint=true, openWorldHint=true and destructiveHint=false, so the safety profile is covered. The description adds the returned field set and the optional windowing behavior, but says nothing about result volume, pagination expectations, or whether an empty list is possible.

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 front-loaded sentence naming the resource and its fields, followed by the optional filter and the endpoint. Nothing is wasted, though the parenthetical example is the only thing that would be lost if trimmed.

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 enumerates the returned fields and notes the optional windowing, while all four parameters are fully self-documented in the schema. For a simple read-only list endpoint this is close to sufficient; only the distinction from other leave-listing tools is missing.

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%: page, per_page, start_date and end_date are all documented including the paired-usage constraint. The description only restates the optional date-window filter, adding no syntax or behavior beyond the schema, so 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?

The description names the specific resource (restricted leave dates), gives a concrete example ('year-end freeze'), and enumerates the returned fields (name, start/end date, duration). The list verb is carried by the title rather than the description text, but the resource is unambiguous against siblings like list_company_holidays.

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?

It states that results can optionally be narrowed to a date window, but gives no guidance on when an agent should use this instead of charliehr_list_company_holidays or charliehr_list_leave_types, nor any prerequisites. Usage is only implied by the resource name.

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