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

Annotations already declare readOnlyHint=true, destructiveHint=false, openWorldHint=true, so safety is covered. The description adds real value by naming the required Cotlet API key with access to the app and identifying the data source (Profile > Orders). It stops short of describing pagination or result 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?

The definition is short and front-loaded, but the returned fields are listed twice ('package, date, amount and order number' then 'order number, package, date and amount in USD'), which is redundant. The 'Profile > Orders' reference is marginally useful UI context rather than call guidance.

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, optional-parameter read tool whose annotations cover the safety profile, the description is broadly adequate — it covers purpose, output fields, auth, and a sibling handoff. It omits pagination/result-window behavior, which is the main remaining 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 the sole 'since' parameter is fully documented in the schema, so the baseline is 3. The description does not mention the date filter or add any format/semantic 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 uses a specific verb+resource ('Lists the orders in your account') and enumerates the returned fields (order number, package, date, amount in USD), so the agent knows exactly what it produces. It does not explicitly distinguish this from any sibling, but no sibling overlaps the orders-listing purpose, so ambiguity is low.

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 provides a cross-reference to a sibling ('Use order_id with request_refund') and notes the required API key, which is useful routing context. However, it never states when to call this tool versus not calling it, nor any prerequisites beyond the credential, so guidance is implied rather than explicit.

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