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

With readOnlyHint=true already declaring the safety profile, the description adds only the scope word 'in the organisation' and the raw endpoint path. It says nothing about pagination behavior, default page size, ordering of results, or what an empty result means.

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 short clauses with zero padding and the purpose front-loaded. The endpoint path is arguably redundant with the tool name but is compact enough not to hurt.

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 filtered-list tool with fully documented params and readOnly annotations, the essentials are covered. However, with no output schema, the description should hint at the result shape or pagination envelope, and it does not.

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% (page, per_page, search_string all documented), so the schema carries the parameter semantics and the description adds nothing. Baseline 3 applies per the high-coverage rule.

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 expenses recorded in the organisation') and even names the backing endpoint, so the agent knows exactly what it retrieves. The differentiation from near-siblings like limoexpress_list_invoices is only implicit in the noun 'expenses'.

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?

There is no when-to-use or when-not-to-use guidance, no mention of the alternative list tools (invoices, bookings), and no prerequisites. The only guidance is the self-evident implication of the tool name.

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