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

Annotations already declare readOnlyHint=true, idempotentHint=true, and destructiveHint=false, so the safety profile is covered. The description adds valuable context: no charge for this operation (billing happens at solve), and bulk support via task_ids. This goes beyond annotations and clarifies cost behavior, which is useful for an agent.

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 two sentences, front-loaded with the core purpose, and includes a separate note for bulk support. Every sentence earns its place with no redundancy.

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?

Given the tool's simplicity (2 params, no output schema), the description covers the essential purpose, billing behavior, and bulk capability. It doesn't explain return format, but with no output schema and a straightforward query operation, this is acceptable. The main gap is parameter relationship details, but overall it's complete enough for an agent to use 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?

Schema description coverage is 0%, so the description must compensate. It explains task_id is the identifier for an existing captcha task and mentions task_ids for bulk execution, but doesn't detail format, constraints, or relationship between the two parameters (e.g., whether task_ids is an alternative to task_id). The description adds some meaning but leaves gaps.

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 the tool queries the result of an existing captcha task by task_id, which is a specific verb+resource combination. It distinguishes from sibling solve tools by focusing on result retrieval rather than creation, though it doesn't explicitly name alternatives.

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 after a task is created via a solve tool, and notes billing occurs at solve time, not here. It mentions bulk support for batched execution, providing clear context. However, it doesn't explicitly state when not to use it or name alternative tools.

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