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

readOnlyHint=true already tells the agent this is a safe read. The description adds that it returns the employee's message and half-day detail and names the backing endpoint (GET /leave_requests), but says nothing about pagination behavior or default ordering beyond what the schema's limit/offset already imply.

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 tight sentence plus an endpoint reference; the scope qualifier is front-loaded and every clause carries information. Slightly terse in that '(and past ones)' is ambiguous about whether it means filtered history or closed requests.

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 helpfully enumerates the returned fields (user, leave type, dates, half days, message), which is what an agent needs to decide whether this tool answers its question. A note on ordering or default pagination would make it complete.

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 limit/offset/include_deleted descriptions are already detailed. The description adds no parameter guidance, so the baseline of 3 applies – the schema carries the full burden.

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 (list leave requests) and narrows the scope to those awaiting a decision plus past ones, then enumerates the returned fields. It does not explicitly differentiate itself from close siblings like rotacloud_list_leave or rotacloud_get_leave_request, but the scope qualifier makes the intent readable.

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 phrase 'awaiting a decision (and past ones)' implies the retrieval context (pending approvals plus history), which is useful, but there is no explicit when-to-use versus rotacloud_get_leave_request for a single request or rotacloud_list_leave. Usage is implied rather than directed.

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