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

Beyond the readOnlyHint and non-destructive annotations, the description reveals that the call itself is free, moves no money, and returns payment URLs. It also discloses feedback handling behavior: reports are read daily and receive no individual reply. This is valuable behavioral context exceeding the annotations.

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?

Every sentence earns its place: service/pricing summary, free call guarantee, purchase channels, and feedback process. The most important scoping information is front-loaded, and there is no redundant repetition of the title or schema.

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 read-only tool with an output schema and clear annotations, the description fully covers purpose, cost behavior, payment channels, and feedback expectations. Nothing essential is missing for an agent to invoke and interpret this tool correctly.

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 the schema coverage is 100%, so parameter-level documentation is unnecessary. The description correctly focuses on the tool's information payload rather than nonexistent 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 states this tool presents an agent-exec service card covering what is sold, pricing, and payment location. It distinguishes itself from the paid execute tool and the HTTP execution path, making its informational role unambiguous.

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 explains that code execution should be purchased via the paid execute tool or plain HTTP, and directs feedback and questions to POST /feedback, clearly differentiating alternatives. It does not explicitly say 'use this tool when you need pricing/service information,' but that context is strongly implied.

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