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

With no annotations, the description carries the full burden. It does disclose one important behavior: 'No disk access,' which signals a side-effect-free, non-filesystem-touching check. However, it does not mention return values, failure behavior, or whether any network/other side effects are possible.

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 and has no filler. The key safety guarantee ('No disk access') is front-loaded. It could be considered too terse, but as far as conciseness, every word earns its place.

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 is under-specified. It does not explain what 'looks safe' means, what the tool returns, how to choose the correct parameter, or how it relates to sibling validators. This is insufficient for an agent to confidently invoke 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 coverage is 100%, so the schema already documents all parameters. The description adds no parameter-level meaning beyond the schema, and given the schema contains many unrelated-looking fields, it does not help the agent decide which parameter matters. Baseline 3 applies because the schema covers the details.

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 gives a specific verb ('check') and resource ('a path'), and the phrase 'looks safe' suggests a validation or shape-check operation. However, it does not define what 'safe' means or distinguish itself from sibling validators like wiki-title-ok or browser-url-ok.

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 about when to use this tool versus alternatives. 'No disk access' hints at a non-invasive check, but the description does not state conditions, exclusions, or preferred use cases compared to the many sibling validation tools.

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