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

With no annotations, the description carries the full burden. It usefully discloses the spending threshold and approval requirement plus the x402 signature dependency, but says nothing about whether the call is read-only, what it returns, or any rate/auth constraints. Partial disclosure for a zero-annotation 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?

Two tight sentences, front-loaded with the resource identity followed by the policy threshold. No filler, though the second sentence blends behavior and parameters.

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 parameterless discovery tool with no output schema, the description should explain what discovering yields. It covers the policy constraint but leaves the return surface and the role of the x402 signature unexplained, so an agent knows the subject but not the output.

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?

Zero parameters, so the schema baseline would be 4. However, the description references a 'caller-supplied x402 signature' while the input schema is an empty object with additionalProperties=false, creating ambiguity about where that signature is supplied. This mismatch warrants holding at 3.

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 it is a discovery tool for the 'HumanMirror HTTP 402 auto-resolve gateway for Base/USDC', which identifies a resource and domain. But 'Discover' is a weak verb that doesn't say what is returned or how this differs from the many sibling humanmirror_x402_* tools, so sibling differentiation is absent.

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 description gives a threshold rule (up to 0.005 USDC auto-resolves, larger amounts need approval), which is useful context, but there is no explicit when-to-use-this-vs-alternatives guidance among the 13 sibling x402 tools. Usage must be inferred.

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