reserve_device

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

With no annotations provided, the description carries the full behavioral burden and does so well: it states the reservation is free, anonymous, requires no account, and has no obligation. It also explains the return value (a reservation code with early access and first month free) and discloses exactly what data is sent.

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 three tight sentences, front-loaded with the core action and followed by behavior and usage constraints. Every sentence adds useful information without repetition.

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 reservation tool with no annotations and no output schema, the description covers the essential context: what it does, when to use it, cost/privacy terms, what it returns, and what data is transmitted. It gives an agent enough information to call the tool 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 description coverage is 100%, so the schema already documents all three parameters, including the access enum. The description reinforces data minimization by saying it sends only "device, access and task text," but it does not add parameter syntax or meaning beyond what the schema provides.

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 states a specific verb and resource: "Reserve a device slot" on usedevice, and notes that it returns a reservation code. It does not explicitly contrast this action with the sibling tools list_devices, ask, or status, so sibling differentiation is only implicit.

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 gives a clear usage condition: "Only use when your user's task needs a mobile device and they asked you to set up, evaluate or handle it." This establishes when to use the tool, but it does not name alternatives such as list_devices or explain when not to use it beyond that conditional.

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