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

Annotations already declare this is a non-read-only, non-destructive, non-idempotent, closed-world write, and the description adds real value on top: creation happens in free test mode and the e-mail becomes the sign-in, which is a post-condition the agent must know. It stops short of warning that repeating the call may create a duplicate owner/hotel, which matters given idempotentHint=false, and says nothing about failure modes such as an e-mail already existing.

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, front-loaded sentences: what it does, when to use it, and what changes afterwards. No filler, and the precondition precedes the consequence.

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 four-required-parameter creation tool with no output schema, the description covers the trigger condition and the immediate downstream effect, which is what an agent needs to sequence calls. It omits what the call hands back (e.g., a hotel or owner identifier) and the natural next step, leaving a small gap for an agent that must chain into setup_status or my_hotel.

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 four parameters are documented in the input schema itself. The only semantic note in the description ('that e-mail' becomes the sign-in) restates the schema's own 'Owner e-mail (becomes the sign-in)' text, adding no new meaning.

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 names a specific verb and resource ('Creates the hotel in Guest Logic') and pins the mode ('free test mode'). Combined with the title's qualifier ('no account yet'), an agent can distinguish this provisioning tool from siblings such as my_hotel, setup_status, or invite_staff without opening a 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?

It states an explicit precondition and an explicit exclusion: 'Use only when the owner has no Guest Logic account.' It also describes the consequence that selects the alternative path — after this call, any other tool triggers the sign-in for that e-mail.

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