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

No annotations are provided, so the description must disclose behavioral traits. It mentions price and that it's a purchase, but does not explain how the result is delivered (e.g., synchronous vs. contract-based), what happens after payment, or whether prerequisites like registration or api_key are needed. The description leaves the agent uninformed about the transaction flow.

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 concise (one sentence) and front-loaded with the price and what the user gets. There is no fluff, but it is perhaps too terse, omitting crucial usage details. Still, for conciseness, it is efficient.

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 and no annotations, the description must cover what the tool returns and how to use it. It does not mention the expected output (e.g., a summary in the target language) or how to provide the text/document within task_payload. It also doesn't explain the payment options (api_key vs x_payment) or any contract flow, making it incomplete for a purchase 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%, so each parameter has a generic description. The tool description adds the key detail that task_payload should contain text/document and a target language, which is not explicit in the schema's generic example. However, it doesn't specify the exact structure of task_payload for this service, so the added value is partial.

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 a specific action ('Buy') and a resource ('summarize_text'), and it mentions the core inputs (text/document and target language). It distinguishes from sibling buy_* tools by the service name, though it doesn't elaborate on what the summarization does exactly (e.g., output language vs. translation).

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 implies usage for summarization tasks but does not explicitly say when to use this tool over siblings like buy_analyze_document or buy_analyze_image. It lacks exclusion criteria or alternative guidance, though the service name itself provides clear intent.

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