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

The description reveals one important behavioral trait: no disk access, meaning it is a non-destructive syntactic check. However, it does not define what counts as 'safe', whether it returns a boolean or throws, or whether the path must be absolute or normalized. With no annotations, the description carries the burden but only partially meets it.

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 two short sentences with no filler. It front-loads the purpose and then adds a useful safety qualifier. Nothing extraneous is present.

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 simple validation tool with no output schema, the description gives the core purpose and a key safety trait, but it omits the return format, defines no notion of 'safe', and does not address the unusually broad nine-parameter schema. An agent would still need additional inference to use it correctly.

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 baseline of 3 applies. The description adds no parameter-level meaning beyond the schema and does not clarify that only 'path' is relevant while the other eight parameters appear unrelated to the stated tool purpose. This could leave an agent uncertain about which parameter to populate.

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 action and resource: check whether a path looks safe. The tool name reinforces that this is about file-path validation. It is specific enough to be distinguishable from URL/domain checkers, though it does not explicitly contrast with sibling tools.

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, domain-shape, or wiki-title-ok. The description implies it is for path safety checks but provides no exclusions, prerequisites, or conditions that would help an agent decide between related shape-checking tools.

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