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

Annotations already declare readOnlyHint=true, and the description's 'FreeAgent: GET /v2/expenses' is consistent with that. It adds no behavioral context beyond the annotation, such as pagination behavior, default ordering, or rate limits.

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 sentences, front-loaded with the purpose and resource, with no filler. The API endpoint reference is compact and clearly separated.

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 read-only list tool with full schema documentation and no output schema, the description covers what the tool returns (expense claims) and its filter scope. Only return shape and paging defaults are left implicit, which the schema largely covers.

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%, so all seven parameters are already documented in the schema with formats and defaults. The description only restates the date-range and project filters, adding no syntax or behavioral detail beyond the schema.

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 states a specific verb and resource ('List expense claims'), and usefully scopes what counts as an expense (out-of-pocket spending and mileage). It doesn't need to differentiate from a sibling since no other expense-listing tool exists, but it also makes no explicit contrast.

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 notes the listing is 'optionally by date range or project,' which hints at when the filters apply, but gives no guidance on when to prefer this tool over alternatives or any exclusions. Usage is only implied.

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