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

No annotations are provided, so the description carries the full burden. It does disclose one important behavior: 'No disk access', which is a clear behavioral constraint. However, it does not explain what the tool actually does with the 'path' (e.g., what checks it performs), what the return format is (e.g., boolean, error message), or whether the 'path' parameter is optional given that many other parameters exist. It also does not disclose any side effects or side-effect-free nature beyond disk access; the phrase 'looks safe' is ambiguous. This is minimal disclosure for a validation tool.

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: 'Check whether a path looks safe. No disk access.' It is efficient, front-loads the purpose, and adds a key behavioral caveat. No wasted words. However, it could be slightly more structured by providing a tiny bit more detail on what 'safe' means, but that is a matter of content, not conciseness. For the length, it earns a high score.

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 relatively simple (a path check) with no output schema and no annotations. The description tells us it does not access disk, but it does not explain the expected output, error behavior, or how to interpret the result. With 9 parameters (though likely only one relevant), an agent might not know which parameter to use; the description only mentions 'path'. There is no guidance on handling invalid paths or what happens if other parameters are provided. The description is insufficient for an agent to confidently call the tool correctly.

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 has 9 parameters, all with descriptions that are present (100% coverage), but the descriptions are sparse and mostly just restate the parameter name (e.g., 'City name for a public weather hint' adds a bit of context but not much). The tool description does not explain how the 'path' parameter interacts with the others; it appears the tool might accept multiple types of inputs, but the description only mentions 'path'. Given high schema coverage, the baseline is 3, and the description adds minimal extra meaning (only 'no disk access' for path). It does not clarify that the other parameters are probably unused or irrelevant for this tool, which could confuse an agent.

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 'Check whether a path looks safe. No disk access.' conveys a specific verb ('Check') and a resource ('a path'), and distinguishes the tool as a pure shape/validation check with no disk side effects. However, the description is terse and does not clarify what constitutes 'safe' (e.g., no traversal, no absolute paths), leaving room for interpretation. It partially differentiates from siblings by the 'no disk access' phrase, but it does not name any specific sibling alternative.

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 says 'No disk access', which implies the tool is for static analysis and should be used when you want to validate a path without touching the filesystem, but it does not explicitly state when to use it versus other validation tools (e.g., browser-url-ok for URLs, validate-json for JSON). There are no examples, no conditions, and no mention of when not to use it. The sibling list includes many similar validation tools, but the description provides no routing guidance.

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