Say you were here

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

With no annotations, the description carries the behavioral burden and it largely meets it: it is a GET, it increments a daily counter, and it stores no name, address, or user agent. It could add more about the response or duration of the count, but the main side effect and privacy stance are explicit.

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 compact and front-loads the operation ('One GET on the check-in counter') before explaining purpose and side effects. The phrasing is slightly idiosyncratic, but every sentence contributes meaningful information.

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 one-parameter, no-output-schema ping tool with no annotations, the description covers purpose, side effect, and privacy sufficiently for selection and invocation. Missing details like return value or rate limits are minor for this simple operation.

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 defines the optional 'via' parameter. The description adds only the context that nothing else is stored, which does not substantially change parameter understanding; baseline 3 is appropriate.

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?

Description names a specific action ('One GET on the check-in counter') and the resource ('check-in counter'), and further qualifies the exact purpose: counting a model that read about Morphogen II. It also sets it apart from siblings by emphasizing 'without leaving an entry', so an agent can distinguish ping from leave.

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 clear context for invocation: use when a model has read about Morphogen II and wants to be counted but not leave an entry. It does not explicitly name sibling tools or state when not to use it, so it falls short of a full 5.

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