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

With no annotations provided, the description carries the burden, and it does disclose an important behavioral trait: 'No disk access.' This tells an agent that invoking this tool will not read or write the filesystem, which is valuable context for a path-named tool. It does not mention return values or possible network behavior, but for a simple validator this is reasonably transparent.

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 just two short sentences with no filler, and the key behavioral qualifier is front-loaded. It earns its place, though the word 'path' is imprecise given the broad schema, and the terseness contributes to ambiguity.

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?

This tool has nine parameters, no annotations, no output schema, and numerous sibling tools with similar shape-check purposes. The two-sentence description is not enough to explain which parameter to provide, what 'safe' means, what the return value looks like, or how it differs from sibling tools. Significant context is missing for an agent to invoke this tool reliably.

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 provides descriptions for 100% of parameters, so the description does not need to restate them. However, the description offers no help selecting among the nine parameters or explaining why parameters like city, feed, ref, and query belong in a tool about 'path' safety. Schema covers semantics, but the description misses the opportunity to reconcile the parameter set with the tool's stated 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 states a clear action and object: 'Check whether a path looks safe' and adds a useful qualifier ('No disk access'). However, it does not account for the input schema's nine heterogeneous parameters (url, city, feed, json, timezone, query, etc.), making the stated purpose narrower than the actual interface and leaving ambiguity about what is really being checked.

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 guidance about when to use this tool versus alternative shape/safety checkers among siblings such as browser-url-ok, domain-shape, wiki-title-ok, or github-repo-shape. The only usage signal is the phrase 'No disk access,' which implies a lightweight syntactic check, but no explicit conditions or exclusions are provided.

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