validate_url

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

With no annotations, the description must explain behavior. It states the return values (status, content type, size) but does not disclose how the validation is performed (e.g., network request, redirects, timeouts) or what happens for unreachable URLs. This is partial transparency but lacks depth.

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?

Two sentences provide the action, context, and output in a well-structured, front-loaded manner. No redundant information or filler.

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?

The tool is simple, but without annotations, the description covers only the happy path. It doesn't discuss error handling, timeout behavior, or what 'unreachable' means. The presence of an output schema helps, but the description could be more complete for a validation 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?

The description does not mention either parameter (url or timeout_profile). With 0% schema description coverage, this is a clear gap. The schema shows a default for timeout_profile but no meaning is added by the description.

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 'Validate' with resource 'URL' and context 'before scraping', clearly distinguishing it from sibling tools like scrape_url or get_metadata. It also summarizes the output, leaving no ambiguity about its purpose.

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 phrase 'before scraping' provides explicit context for when to use this tool, implying it is a pre-flight check for scraping operations. It does not explicitly name alternative tools or exclusions, but the use case is clear enough for an agent to select it appropriately.

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