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

No annotations are provided, so the description carries the full burden of disclosing behavior. It adds the quota fact ('5 free trial calls per registered wallet') which hints at wallet registration and rate limits, but it does not describe side effects, network usage, required authentication, or what a successful audit produces. The core audit behavior is left completely unspecified.

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 short and front-loaded, with no wasted sentences. However, the first clause is essentially a restatement of the tool name, and the only substantive addition is the free-trial quota note, so the description is concise without being informative.

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?

With no output schema, no annotations, and only three vaguely defined optional parameters, an agent cannot determine the correct call shape, expected result, or prerequistes. The free-trial note is the sole piece of contextual detail beyond the tool's name, which is insufficient for a security-audit tool.

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 coverage is 100%, meeting the high-coverage baseline, but the schema descriptions ('Name to process', 'Package to process', 'Version to process') are generic and nearly meaningless. The tool description itself adds no mapping of these fields to npm package identifiers, so the agent gets little real semantic help.

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 identifies the domain ('NPM package') and high-level task ('security audit'), but it is a noun phrase that largely restates the tool name rather than a specific verb+resource statement. It doesn't say what the audit checks, what it reports, or how it differs from neighboring tools like x402-pip-audit.

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 versus alternatives. It never mentions x402-npm-package-info, x402-pip-audit, or any condition that would select this tool, and it provides no exclusions or fallback instructions.

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