fang_url

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

Annotations indicate readOnlyHint=false, which aligns with the description's transformation behavior. The description clearly states the two operations (defang/refang), adding context beyond annotations. However, it does not disclose whether the transformation modifies input text or returns new output, nor any side effects.

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 a single, efficient sentence that conveys the tool's purpose without any fluff. It is front-loaded with the core action and context.

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 low complexity and full schema coverage, the description covers the essential purpose and operations. However, the lack of an output schema means the description could better hint at the return format (e.g., transformed text), but it's a minor gap.

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 input schema describes both parameters with 100% coverage. The description does not add additional meaning beyond what the schema provides. The enum values 'defang' and 'refang' are self-explanatory, so no further elaboration is necessary.

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 defangs or refangs URLs for safe sharing with a security analysis context. The verb 'defang/refang' is specific and distinguishes it from sibling URL encoding tools.

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 in security analysis to make URLs safe or restore them, but provides no explicit guidance on when to use this tool versus alternatives like encode_url or decode_url. No when-not-to-use or prerequisites mentioned.

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