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

With no annotations, the description carries the full burden. It discloses 'No disk access,' which is a useful safety trait, but it fails to explain what 'safe' means, what happens when a path is unsafe, whether the tool returns a boolean or other data, or that it discards inputs after validation. The description is severely under-specified for behavioral understanding.

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 a single concise sentence with no fluff, which is structurally efficient. However, it is under-specified to the point of being incomplete for a tool with nine parameters. Conciseness is achieved at the expense of necessary detail, so it is only adequate.

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 (9 optional parameters, no output schema, no annotations), this description is grossly inadequate. It does not explain the tool's multi-purpose nature, return format, or limitations beyond 'no disk access.' An agent cannot reliably know when to invoke this tool or what to expect from it.

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 the schema already documents every parameter. The description adds no parameter-specific meaning beyond implying the 'path' parameter is relevant. Baseline 3 applies because the schema handles parameter semantics, but the description does not clarify that other parameters (url, city, etc.) are also accepted, which is a scope ambiguity the description should 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.' This identifies the core purpose. However, it does not differentiate from sibling shape-checking tools (e.g., url-path-len, wiki-title-ok) and ignores that the schema supports many other input types (ref, url, city, etc.), so the stated purpose is narrower than the tool's actual scope.

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. It does not mention any conditions, prerequisites, or exclusions. The phrase 'No disk access' implies it is a safe check, but it provides no context for selecting this tool over the many related shape-checking siblings.

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