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

With no annotations, the description carries the full behavioral burden. The explicit 'No disk access' is valuable and clarifies a non-side-effecting trait. However, it doesn't state return behavior, validation thresholds, or how it treats the various optional parameters, leaving important behavioral gaps.

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 exceptionally concise: one purpose sentence and one behavioral qualifier, both front-loaded with zero filler. Every word earns its place, and the structure is easy to scan.

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 optional parameters, no required fields, and no output schema, the description is severely incomplete. It does not explain expected input patterns, what constitutes a 'safe' path, return values, or error behavior. An agent cannot reliably call it correctly without inspecting the schema and making assumptions.

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 coverage is 100%, so each of the 9 parameters has an individual description in the schema. The tool description adds no additional meaning beyond the word 'path', and it fails to clarify why the schema contains unrelated parameters like city, zone, and query. Baseline 3 is appropriate because the schema carries the semantics, but the description offers no extra value.

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'), and the second sentence adds a distinguishing safety property ('No disk access') that separates it from side-effecting tools. However, it doesn't explain what 'safe' means or how it differs from sibling shape-checking tools beyond the path focus.

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 on when to use this tool versus alternatives like browser-url-ok or domain-shape. No prerequisites, exclusions, or context about expected call scenarios are given; the single sentence implies a purpose but offers no selection criteria.

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