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

There are no annotations, so the description carries the full burden. It only discloses 'No disk access,' which is a useful safety trait but applies only to the path parameter. No information is provided about side effects, reversibility, or behavior for the other eight parameters. The description is severely under-informative for a tool that clearly handles multiple input types.

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 short (one sentence plus a safety note), but for a tool with nine parameters and a multi-purpose schema, this brevity is under-specification rather than effective conciseness. The description is not front-loaded with the most important information; it focuses on one narrow aspect while ignoring the tool's actual scope.

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?

Given the tool's complexity (nine parameters, no annotations, no output schema), the description is grossly incomplete. It explains only the path check and completely omits what the tool does with URLs, JSON, timezones, search queries, etc. An agent cannot determine the tool's full functionality or know that it can validate other kinds of inputs, making the description inadequate for correct selection and 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?

The input schema has 100% parameter description coverage, so each parameter is documented with a short phrase (e.g., 'File path to check; no disk access'). The tool description adds nothing beyond the schema—it only restates the path check. Given the high schema coverage, a baseline of 3 is appropriate, but the description does not compensate for the fact that most parameters are unrelated to the described purpose, so the semantic clarity across the full parameter set remains weak.

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 specific verb and resource: 'Check whether a path looks safe.' However, the schema includes eight other parameters (ref, url, city, feed, host, json, zone, query) that suggest the tool can validate many different kinds of inputs, not just paths. The description fails to capture the tool's actual breadth, making its purpose only partially clear and potentially misleading.

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?

No guidance is given on when to use this tool versus its many siblings like browser-url-ok, validate-json, or timezone. The description does not mention alternatives or exclusion conditions, leaving the agent to guess whether to call this generic checker or a specialized sibling. This is a critical gap for a tool with such a wide schema.

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