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

With no annotations provided, the description carries the full burden of disclosing behavior. It does add one useful behavioral trait: 'No disk access,' which reassures agents that this is a lightweight shape check with no filesystem side effects. However, it does not explain what the tool returns, whether it performs network access, or what 'looks safe' means, leaving significant behavioral ambiguity.

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 with no filler words. Each sentence earns its place: the first states the core purpose, and the second adds a relevant safety guarantee. It is not bloated, though it may be too brief for the apparent scope of the tool.

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?

The tool has a complex schema with nine parameters and no output schema or annotations, yet the description only covers the 'path' concept and the no-disk-access behavior. It does not explain the return format, which parameter to use for a given intent, or how to interpret 'safe.' This is insufficient for an agent to reliably select and invoke the tool across its full input variety.

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 all parameters in detail. The description adds no parameter-level meaning beyond mentioning 'a path,' which matches the existing path property but also conflicts with the broad set of other parameters. Since the schema carries the parameter documentation burden, the baseline of 3 applies.

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 specific action and resource: checking whether a path looks safe. However, 'safe' is vague, and the input schema lists many unrelated parameters (ref, url, city, feed, host, json, zone, query), so the description does not fully disambiguate what the tool actually operates on. It also does not explicitly distinguish this from sibling tools like browser-url-ok or wiki-title-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 on when to use this tool versus alternatives such as browser-url-ok, playwright-url-ok, or normalize-url. The only hint is 'No disk access,' which implies it is a safe read-only check, but no explicit when-to-use or when-not-to-use context is provided.

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