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

Annotations already declare readOnlyHint=true, idempotentHint=true, openWorldHint=true, and destructiveHint=false, covering the safety profile. The description adds valuable behavioral context beyond these: a performance guarantee ('under 1.6 seconds') and the underlying mechanism ('visual layout heuristics'), plus the 'real-time' nature of detection. This helps the agent set expectations without redundancy.

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 sentence that front-loads the core purpose ('Audit and inspect any URL') before enumerating threat categories and constraints. It is reasonably concise and information-dense, but the long list of threats and modifiers makes it slightly run-on; still, every part 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?

The tool has a single parameter, high schema coverage, rich annotations, and an output schema, so the description need not explain return values. It covers purpose, threats, method, and performance, leaving no critical operational gap for an agent to call the tool correctly. It could mention output format or edge cases, but the existing structured data compensates.

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 for the single parameter is 100%, so the baseline is 3. The description adds meaningful semantic detail beyond the schema by enumerating the specific attack categories the URL is checked against (phishing campaigns, smart contract wallet drainers, credential harvesting kits, brand impersonation) and the method, giving the agent a richer understanding of what the parameter is used for and what results to expect.

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 clearly states the verb ('audit and inspect') and the resource ('any URL'), listing specific threat categories (zero-day phishing, wallet drainers, credential harvesting kits, brand impersonation) and the method (visual layout heuristics). It is specific and actionable, though it does not explicitly distinguish itself from the sibling tool opticparse_scrape, so it misses the top score.

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?

The description implies usage for security auditing of URLs by its explicit threat-focused wording, but it provides no 'when to use vs. when not' guidance, no exclusions, and no reference to the sibling tool opticparse_scrape. The context makes the intended use fairly clear, but the agent is left to infer when to prefer this tool over alternatives.

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