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

Since there are no annotations, the description carries the full burden of behavioral disclosure. It describes the complex payment gating mechanism (402 error and subsequent required retry logic) which is critical behavioral information.

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 technical description is dense but well-structured, segmenting free vs. paid usage in a manner that guides the agent effectively without unnecessary fluff.

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 contract tool, the description is maximally complete, covering the specific operational requirements (payment, network, URL access) needed to use or troubleshoot the paid endpoints.

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 zero parameters and 100% schema coverage. Baseline score for 0 parameters applies, as the description is not required to define inputs.

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 clearly defines the scope of the tool—providing contracts, pricing, and access mechanisms—distinguishing it as a meta-informational tool rather than an execution tool like its siblings.

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 provides explicit usage instructions, explaining that while free information is available, paid calls require a specific workflow: making the initial call to receive the HTTP 402 and then retrying with a PAYMENT-SIGNATURE.

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