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

Beyond the read-only/idempotent/non-destructive annotations, the description discloses a non-obvious behavior: this connection lacks the required sign-in, and calling the tool is still correct because it will return guidance on what is wrong and how to fix it. No contradiction with annotations exists.

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 concise sentences with no filler, and each adds needed information: auth prerequisite, what the tool does, and the directive to call it anyway for the fix message. The most important caveat is front-loaded.

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 zero-parameter tool with no output schema and strong annotations, the description covers everything an agent needs: what the tool returns, why sign-in matters, what will happen when called, and how to respond to the user. No material operational detail is missing.

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?

The input schema has no parameters, so the baseline is 4; the description mentions conceptual filtering dimensions such as date window, room, and booking number despite there being no formal parameters. There is no schema-level parameter to elaborate, and the description does not need to document formatting.

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 that the tool returns reservations within a date window, by room or booking number, when signed in, so an agent can identify its core function. It does not explicitly reference sibling tools such as reservation_detail or search_stays, so it lacks the contrast that would earn full marks.

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 an explicit trigger: call it when the user asks for reservations/bookings, and explains why to call it despite the missing sign-in because the tool surfaces a helpful error with how to fix it. It does not discuss when-not-to-use or point to alternatives among the sibling tools, so usage guidance is strong but not exhaustive.

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