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

There are no annotations, so the description carries the behavioral burden. It does disclose 'No disk access,' which is a useful safety trait, but it does not explain what 'looks safe' means, whether there are any side effects, what the return value is, or why the input schema contains many unrelated parameters.

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 front-loaded: the first sentence states the action, the second adds a safety constraint. Both sentences earn their place, though the brevity leaves important information unstated.

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 tool with 9 optional parameters, no output schema, and no annotations, the description is too terse. It does not define what makes a path 'safe,' which parameter should be provided, or what output shape to expect, leaving an agent uncertain about correct invocation.

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%, and every parameter already has a description in the schema. The tool description adds no parameter-level meaning, so the baseline of 3 is appropriate even though the schema's parameter descriptions seem inconsistent with the stated path-checking purpose.

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 a specific verb and resource: check whether a path looks safe, and adds a meaningful qualifier ('No disk access'). It does not explicitly differentiate this from sibling shape-check tools, but the name and phrasing make the core purpose understandable.

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 gives no guidance on when to use this tool versus alternatives like normalize-url, browser-url-ok, or wiki-title-ok. It implies a validation/safety-check use case, but does not state when it is the right choice or when a sibling tool would be preferable.

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