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

With no annotations, the description must carry the full burden of behavioral disclosure. It states 'No disk access,' which is a useful safety trait, but it does not mention what the tool actually returns (boolean? error?), how it handles invalid inputs, or what happens when multiple parameters are provided. The description is silent on the behavior for the non-path parameters entirely.

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, terse sentence with no fluff, which is structurally concise. However, it is under-specified for the tool's actual parameter breadth, so conciseness comes at the cost of clarity. It is not effectively front-loaded because the core scope is misrepresented.

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 optional parameters covering distinct domains (URLs, JSON, timezones, searches, etc.) and no output schema, the description is grossly incomplete. It only addresses the 'path' case and provides no information about return formats, validation behavior, or when the other parameters are relevant. An agent cannot correctly invoke this tool for non-path inputs.

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?

The input schema has 100% description coverage, so every parameter already has a semantic explanation. The description adds no additional parameter meaning beyond the schema, and it only references 'path' while ignoring the other 8 parameters. Baseline 3 is appropriate since the schema does the heavy lifting.

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 specifies a verb ('Check'), a resource ('a path'), and a safety qualifier ('looks safe'), plus a side-effect note. However, the input schema accepts 9 unrelated parameters (URLs, JSON, city, timezone, etc.), so the description only covers one of many use cases and is misleading about the tool's overall scope. It does not distinguish this tool from sibling shape-checkers.

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 the many sibling shape-checking tools (browser-url-ok, domain-shape, validate-json, etc.). The description does not mention any conditions, prerequisites, or alternatives, leaving the agent to guess which tool fits which input type.

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