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

Goes well beyond annotations (readOnlyHint=false, destructiveHint=false, openWorldHint=true): it discloses that the cancellation persists in customer history, that waive_penalty is permission-gated, that confirmation is on by default and can be toggled, that the action 'reaches other people' requiring user confirmation, and that a Cotlet API key with app access is needed. This is exactly the operational context an agent needs before mutating.

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?

Front-loaded with the core action, but the 'inside the late cancel window' clause is repeated almost verbatim in two sentences, and the confirmation guidance is split across two redundant statements ('you can switch that off' vs. 'confirm with the user before each call'). The repetition weakens an otherwise tight description.

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 and only two simple parameters, the description covers permissions, penalty semantics, history persistence, confirmation behavior, and auth requirements. Nothing critical is missing for correct invocation, though it could clarify what a successful cancel returns.

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%, so both parameters are already documented, including waive_penalty's role gating and default. The description reinforces the consequence ('without it the fee applies') and names the 'Graced Cancel' concept, but adds only marginal meaning beyond the schema, so the baseline of 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+resource ('Cancel a reservation') with scoping ('Cancels one reservation'), which is easy to distinguish from siblings like mariana-tek_book_reservation or mariana-tek_list_customer_reservations. An agent knows exactly what action is performed without opening the schema.

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?

Explains the key decision context: penalty behavior is only relevant 'inside the late cancel window,' and whether to use waive_penalty depends on role permission. It does not name an explicit alternative tool or a when-not-to-use condition, but for a cancellation endpoint the situational guidance is clear.

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