Check out

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

With no annotations provided, the description must disclose behavior, but it does not. It provides no information about side effects, requirements, or outcomes, leaving the agent blind to what actually happens when invoking this tool.

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 only one sentence, but it is under-specified rather than concise. It does not convey essential information, making it an unhelpful placeholder instead of a well-structured summary.

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?

Although the tool is simple (no params, no output schema), the description fails to explain the fundamental purpose or return value. Given the sibling tools suggest a wellness context, the agent is left guessing what 'check_out' actually does.

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 tool has zero parameters, so there is no parameter detail to document. The description adds no parameter-level information, but none is needed; the baseline of 4 applies for tools with no parameters.

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 'Leave loose and clear-headed, with a short note to carry forward' is vague and metaphorical rather than stating a concrete tool action. It does not identify what the tool does, what resource it acts on, or how it relates to its name 'check_out'.

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?

There is no guidance on when to use this tool or how it compares to alternatives like check_in or meditation. The description offers no context for selection, so an agent cannot determine appropriate usage scenarios.

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