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

Annotations indicate readOnlyHint=false and destructiveHint=false, consistent with a mutation that is not destructive. The description adds behavioral detail: the user is notified by email when the rate drops, and the optional date logic. It does not contradict annotations and provides useful side-effect information beyond the structured fields.

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 description is two sentences, front-loaded with the core purpose, and contains no filler. It efficiently covers the purpose, notification, and optional parameter behavior.

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?

Given a simple 3-parameter tool with an output schema and annotations covering safety, the description is sufficiently complete. It states the purpose, optionality, and side effect. No critical missing information for an agent to invoke it correctly.

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 all parameters are documented. The description adds value by explaining that omitting checkin/checkout monitors any two-night stay, which clarifies the optional usage beyond the schema's basic 'optional' designation. It does not repeat schema descriptions but supplements them with behavioral context.

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 clearly states the tool creates a rate alert for a hotel to monitor price drops, and explicitly notes the email notification. It uses a specific verb (create) and resource (rate alert), and is distinguishable from sibling tools like delete_rate_alert and get_rate_alerts.

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?

The description provides clear context for when to use the tool: to monitor a hotel for price drops. It also explains the optionality of dates, noting that leaving them out monitors any two-night stay. However, it does not explicitly mention alternatives or exclusions, though the sibling list makes the purpose quite clear.

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