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

With no annotations, the description carries the burden and does disclose useful behavior: the call is free (no payment), it returns a verification result, and it enumerates the returned snapshot fields including a SHA-256 hash chain. It stops short of noting auth requirements or rate limits, but for a read-only info tool this is solid disclosure.

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, front-loaded with purpose and then the two modes. The parenthetical field list is dense but informative; nothing is padded, though the sentence is somewhat heavy.

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 re-explained, and the description still adds value by covering both invocation modes, the free/no-payment trait, and the data source. For a simple one-parameter read tool this is essentially complete.

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 single slug parameter has 0% schema description coverage, so the description must compensate, and it does: it explains that supplying a slug returns that listing's snapshot while omitting it returns a summary of all approved listings. This meaningfully disambiguates the parameter's effect beyond the bare schema.

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 names the exact resource (a performance snapshot for an AgentPay Directory listing) and its scope, distinguishing it from siblings like directory_price_check and get_listing_proof. It also clarifies the two operating modes (with slug vs without), so an agent can identify the tool without opening the schema.

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 states that the tool is free/no payment and explains the with-slug vs without-slug behavior, which is implied usage guidance. However, it never says when to prefer this over neighboring tools such as directory_price_check or get_listing_proof, and offers no exclusions.

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