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

With no annotations provided, the description carries the full burden of behavioral disclosure. It usefully states 'No disk access,' indicating this is a side-effect-free, in-memory shape check. However, it does not explain return behavior, error cases, or what makes a path 'safe,' leaving important behavioral details unstated.

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 two short sentences with no filler. The primary action is front-loaded, and the important side-effect disclaimer follows immediately. Every word contributes meaning.

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, so the description should explain what the tool returns or how it signals safety; it does not. The input schema includes nine mostly unrelated properties, yet the description refers only generically to 'a path,' leaving ambiguity about which parameter is actually relevant. This is under-specified for a tool with no annotations and no output schema.

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 each parameter already has its own description. The tool description adds only the general 'path' framing and does not clarify which of the many schema properties is the intended 'path.' Since the schema already documents parameters, the description adds minimal value beyond the baseline.

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 verb and resource: 'Check whether a path looks safe.' It also adds a distinguishing behavioral note, 'No disk access,' which helps separate it from real filesystem operations. However, 'safe' is somewhat vague, and the relationship to similarly named sibling tools like browser-url-ok is implied rather than explicit.

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. It does not mention suitable conditions, exclusions, or compare against any sibling tool. The only usage signal is the imperative 'Check,' which weakly implies validation use.

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