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 does disclose 'No disk access,' which is a useful safety trait, but it does not explain what 'looks safe' means, what happens to the other parameters, what the return value looks like, or any side effects. For a tool that appears to validate multiple inputs, this is insufficient 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?

The description is extremely concise—two short sentences with no filler. It front-loads the primary action and a key safety trait. However, given the complexity of the schema (9 parameters), the brevity borders on under-specification, though that is more a completeness issue than a conciseness one. It earns a 4 for efficiency.

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 9 parameters, no output schema, and no annotations, this description is grossly incomplete. It does not explain the return format, which parameter is the primary input, how the unrelated parameters are handled, or any limitations. An agent would have almost no understanding of how to invoke this tool correctly beyond reading the parameter names.

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 100% description coverage, so each parameter is documented. The tool description itself adds no parameter-level meaning beyond the schema, so the baseline of 3 is appropriate. However, the description's focus on 'path' while the schema includes many unrelated parameters suggests a disconnect that the schema alone does not resolve.

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+resource: 'Check whether a path looks safe.' However, the schema includes 9 parameters, many of which (e.g., 'ref', 'city', 'json') appear unrelated to path checking, creating confusion about the tool's actual scope. It also does not differentiate this tool from siblings like 'browser-url-ok' or 'domain-shape', which might also check safety of URLs or paths. The purpose is present but muddied.

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 provides no guidance on when to use this tool versus alternatives. There is no mention of conditions, prerequisites, or exclusions. It simply states what the tool does without context, leaving the agent to infer applicability from the name and schema.

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