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

No annotations are present, so the description carries the behavioral burden. It transparently indicates a read-only health check, but does not disclose what response is returned, what 'up' means, or how failures are signaled. This is acceptable for a minimal zero-parameter tool, but lacks depth.

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 a single, directly front-loaded sentence with no filler. Every word contributes to conveying the tool's function.

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, no-output-schema health check, the description is mostly complete: it states what is checked and implies a boolean/status result. The only missing piece is the exact response format or status semantics, but the tool's simplicity makes this a minor gap.

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 no parameters and schema coverage is 100%, so there is no parameter-level information the description needs to add. The baseline of 4 is appropriate because the schema fully covers the input side.

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 ('Check') and a precise resource ('agentpay API and MCP'), making the tool's purpose immediately clear. It is easily distinguished from the sibling payment-focused tools.

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?

The intended use—verifying that the API and MCP are operational—is clear from the description. It does not explicitly mention alternatives or exclusions, but the sibling tools are clearly different operations, so the context is sufficient.

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