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

With no annotations, the description carries the full behavioral burden, and it does disclose the two hardest-to-guess traits: the $0.01 USDC charge per call and the x402 payment flow where the agent's wallet executes payment. It does not mention rate limits, failure modes, or latency, keeping it short of a 5.

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 sentences plus an example, front-loaded with the capability, then cost, then payment mechanics, then a concrete call. Every sentence earns its place with no filler.

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?

An output schema exists so return values need not be described, and the description covers capability, cost, and payment path. It stops just short of complete because it never says what error/paid-required responses the agent should expect or how to retry after payment.

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 0%, so the description must compensate, and the embedded example repo_health(repo="octocat/hello-world") is the only thing that reveals the expected owner/name format. That is genuinely additive, though it never states whether the value is required or what format variants are accepted.

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?

States a specific verb (Check) and resource (a public GitHub repo's health) and enumerates exactly what is measured: stars, forks, open issues, license, archive status, 90-day commit velocity. No sibling tool overlaps this domain, so an agent can select it unambiguously.

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 word 'public' implicitly excludes private repos, and the pricing line tells the agent this call has a cost, which is decision-relevant when choosing whether to invoke it. It does not name alternatives or explicitly state when not to use it, but for a unique-domain tool that gap is small.

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