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

With no annotations, the description carries the behavioral burden. 'No disk access' is a useful, non-obvious behavioral disclosure that prevents agents from expecting filesystem side effects. However, it does not explain whether the result is a boolean, error, or message, nor what 'safe' checks are performed.

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 exceptionally short and front-loaded. Both sentences earn their place, and there is no fluff. It loses a point because it is so terse that some needed context is omitted, though conciseness itself is handled well.

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?

There is no output schema and no annotations, so the description should explain what the tool returns and what 'safe' means. It does neither. The presence of nine optional parameters with only one clearly relevant to the tool adds ambiguity, making this incomplete for reliable 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%, so the baseline is 3. The description itself adds no parameter semantics beyond the schema, and the schema includes many unrelated optional properties (ref, url, city, feed, etc.) that could confuse an agent. Still, the 'path' property is clearly described as 'File path to check.'

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 verb/resource: 'Check whether a path looks safe.' This distinguishes it as a validation-style tool. However, 'looks safe' is somewhat vague—it does not define what safety means (traversal, format, existence), so it falls short of a perfect 5.

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 the tool is for path-shape validation by adding 'No disk access,' which suggests it should be used when only a syntactic/safety check is needed. It does not explicitly name alternatives or state when not to use it, leaving usage guidance implicit.

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