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

The 'WRITE:' prefix and endpoint align with the destructiveHint=true annotation, so there is no contradiction. It does add that this affects exactly one booking and is a state mutation. But with no annotation covering side effects, it does not disclose whether the prior status is overwritten, whether the change is reversible, or whether notifications are triggered.

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?

Three short sentences, front-loaded with the WRITE marker and the core action. Every sentence carries information: operation type, targeted resource, and how to source the id.

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 single-parameter mutation with destructiveHint=true and no output schema, the definition covers the mechanics but omits consequences: what the response looks like, what happens on invalid or already-confirmed bookings, and any downstream effects. Adequate but with clear gaps.

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 parameter already documents 'Record id (UUID) from the matching list tool.' The description's pointer to limoexpress_list_bookings largely restates the schema rather than adding new meaning, so 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 with scope: 'set one booking to the confirmed status', plus the underlying endpoint POST /api/integration/mark-booking-as-confirmed. An agent can distinguish it from limoexpress_list_bookings and from the analogous limoexpress_mark_invoice_as_paid without opening the schema, though no explicit contrast is drawn.

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?

Provides a prerequisite workflow ('Use limoexpress_list_bookings to find the id'), which is useful context for obtaining the required argument. However, it gives no guidance on when this action is appropriate versus when it should be avoided, nor what preconditions (e.g. current status) must hold before confirming.

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