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

With no annotations provided, the description carries the behavioral burden and does disclose a key trait: no disk access, meaning it does not check filesystem existence or permissions. However, it fails to define 'safe', state the return type, or describe error and edge-case behavior, leaving meaningful ambiguity.

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, zero filler. The core action is front-loaded, and the 'No disk access' clarification earns its place by preventing a common misassumption.

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 has no output schema, no annotations, nine optional parameters, and many sibling validators. The description is too thin to be complete: it does not explain expected output, the safety criteria, or how the unrelated optional parameters should be handled. This is a notable gap for a predicate-style 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 description coverage is 100%, so each parameter already has explanatory text. The tool description adds no parameter-level meaning and does not clarify why the schema also accepts ref, url, city, feed, host, json, zone, and query while the description only mentions a path. This matches the baseline for high schema coverage.

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 identifies the operation and resource: checking whether a path looks safe. The added 'No disk access' also sets it apart from file-system-touching tools, though it does not explicitly name sibling alternatives or define what 'safe' means.

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?

There is no explicit when-to-use or when-not-to-use guidance. The description hints at a syntactic check with 'No disk access', but it does not direct the agent away from sibling tools like normalize-url, domain-shape, or browser-url-ok, leaving usage selection to inference.

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