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

Annotations already declare readOnlyHint=true, so the safety profile is covered and the description only needs to add context. It does add two useful facts: the endpoint path (GET /public-api/v1/expenses/) and that results are paged with a token-to-parameter mapping. It does not disclose default page size, sort order, or whether the list spans all employees or only the caller's scope.

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 sentences: purpose plus returned-field list first, paging behavior second, endpoint last. Every clause carries information an agent needs, and there is no filler or repetition.

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 parenthetical field list stands in for the return shape, and the pagination contract is spelled out, so an agent can call and iterate correctly. The remaining gap is scope — whether results are company-wide or scoped to the authenticated employee — which matters for a reimbursement tool.

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 parameter's description already documents the 1-based default and the next_page handoff, so the baseline is 3. The description reinforces the loop semantics in the main body ('Paged: pass next_page as page'), which is valuable because the parameter name and the returned token name differ and agents commonly get this wrong.

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 and resource ('List expense reimbursement requests') and enumerates the record fields (employee, amount, currency, kind, status, etc.), so the agent knows exactly what comes back. It is distinguishable from jethr_list_expense_policies and jethr_create_expense by resource and operation, though it never names a sibling to route against.

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 pagination instruction ('Paged: pass next_page as page') gives concrete operational guidance for iterating, which is real usage help. However, there is no statement of when to choose this over jethr_list_expense_policies or jethr_create_expense, and no prerequisites or filtering guidance — usage context is implied by the resource name only.

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