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

With no annotations provided, the description carries the full burden of behavioral disclosure. 'No disk access' is a useful and explicit behavior, but the description does not state what 'safe' means, what return value the caller receives, or whether there are side effects beyond the check.

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 concise: one sentence, no filler, and the key behavioral fact ('No disk access') is front-loaded. It earns its place, though the terseness leaves some gaps in completeness.

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?

There is no output schema and no annotations, so the description must explain the tool's behavior and return contract; it does not. With 9 schema parameters and 25 sibling tools, the description is too thin to let an agent confidently invoke the tool without additional inference.

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 is 3. The description adds no parameter-specific meaning, and the schema's many unrelated properties (ref, url, city, etc.) are not addressed. Since the path parameter is already documented in the schema, the description does not need to repeat it, but it also does not clarify how the other parameters relate to the tool.

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 ('Check') and resource ('a path'), with 'looks safe' indicating a syntactic validation and 'No disk access' distinguishing it from filesystem-based checks. It does not explicitly name sibling tools, but the path-vs-URL contrast is implicit; the extra unrelated input parameters slightly muddy the 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?

No guidance is given on when to use this tool versus alternatives such as browser-url-ok, wiki-title-ok, or domain-shape. There are no exclusions, prerequisites, or selection criteria, leaving the agent to infer use cases from the tool name alone.

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