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

'No disk access' is a meaningful behavioral disclosure beyond any annotation: it tells the agent the check is purely syntactic and side-effect-free, so no filesystem permission or existence check is involved. It does not state the return format, but for a boolean-style checker this is a reasonable level of transparency.

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 short sentences with no filler. The core action is front-loaded and the important side-effect constraint 'No disk access' follows immediately.

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 nine optional parameters and no output schema, this description is too thin. It leaves the agent unsure whether the other schema fields are valid inputs, what the return value is, and when a path would be considered 'safe' from a shape standpoint.

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 already describes all nine parameters with 100% coverage, so the description adds little parameter-level meaning. It clarifies that 'path' is the focus, but does nothing to reconcile why the schema also accepts ref, url, city, feed, host, json, zone, and query.

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?

States a clear verb and resource: it checks whether a file path looks safe, and adds the key constraint 'No disk access.' This distinguishes it from URL/title/query validators in the sibling list by narrowing the scope to file paths.

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 when to use the tool (when a file path needs a safety/shape check) but gives no explicit alternatives or exclusions, such as 'use normalize-url for URLs' or 'does not verify existence on disk.' The usage context is inferable but not stated.

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