detect_captcha

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

There are no annotations, so the description carries the full burden. It communicates the core behavior (detecting presence) and implies a non-mutating read-only action, but it does not specify the return format (e.g., boolean) or whether any page interaction occurs. For a simple detection tool, this is minimal but not misleading.

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 very short and to the point, but it includes an unnecessary emoji (🆕) that adds no informative value. The core sentence is efficient and front-loaded, but the emoji makes it slightly less clean than a purely functional one.

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 0-parameter detector with no output schema and no annotations, the description provides the essential purpose but leaves important context missing. It does not state the return value, possible false-positive behavior, or any caveats. This makes it adequate but incomplete for an agent to fully predict the tool's behavior.

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, so there is nothing to explain beyond the schema. The baseline for 0-param tools is 4, and the description does not need to add parameter detail. It correctly uses no parameter descriptions.

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 uses a specific verb 'Detect' with a clear resource 'CAPTCHA or bot verification' and the scope 'present on the page'. It distinguishes itself from sibling detection tools (detect_popups, detect_ads, detect_login_form) by naming a distinct detection target, making the purpose 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?

No guidance is provided on when to use this tool versus alternatives. There is no mention of context, prerequisites, or exclusions. The description simply states the detection function without situating it in a workflow or distinguishing when it is appropriate.

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