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

Annotations already declare readOnlyHint=true, destructiveHint=false, and openWorldHint=true, so the safe-read profile is covered. The description adds real behavioral context beyond that: the default year scoping, the auth prerequisite ('Needs the user's Cotlet API key with access to this app'), and the shape of the settlement records returned.

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?

The purpose is front-loaded, but the first sentence ('Civitatis: Monthly settlements: services rendered, commission, net amount and payment status') is almost verbatim duplicated by the second sentence ('Lists monthly settlements with the services rendered, the Civitatis commission, the net amount and the payment status'). That redundancy wastes space and dilutes the front-loaded signal.

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 one optional filter, no output schema, and annotations already covering the safety profile, the definition covers purpose, workflow placement, auth requirement, default behavior, and return fields. Pagination/result-size behavior is unaddressed, but the result set (monthly settlements) is inherently small, so this is a minor gap.

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 there is only one optional parameter whose default is already documented in the schema ('Default: current year'). The description's 'The default is the current year' merely repeats the schema, adding no format or filtering semantics beyond it. 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?

States a specific verb and resource ('Lists monthly settlements') and enumerates the returned dimensions (services rendered, commission, net amount, payment status), so an agent knows exactly what this tool covers. It names request_payment as a related sibling, though it does not explicitly contrast itself against it as an alternative.

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?

Gives a concrete trigger: 'Use it before request_payment to see which months are still open.' This tells the agent when this tool sits in the workflow relative to a sibling. It does not spell out when-not to use it or name other list siblings (e.g. civitatis_list_invoices), so it stops short of an explicit routing statement.

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