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

No annotations are provided, so the description must disclose behavioral traits. It explains the AI analysis and return structure but does not specify whether the tool is read-only, if screenshots are stored, or any authentication requirements. This leaves gaps for an agent to assess side effects.

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 at two sentences, front-loading the core function and following with usage guidance. Every word adds value with no redundancy or fluff.

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?

Given the tool's moderate complexity (4 parameters, no output schema), the description adequately covers what the tool does and when to use it. However, it lacks details on behavioral aspects like caching or data retention, which would improve completeness.

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 is 100%, so the description adds little beyond what the schema already provides. It does not elaborate on parameter defaults, constraints beyond the schema, or usage tips. The baseline of 3 is appropriate since the schema is already informative.

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 function ('Screenshot a URL and analyze it for visual bugs using AI') and the output format ('Returns whether issues exist, a summary, and a detailed issues list'). It uses a specific verb and resource combination that leaves no ambiguity about the tool's purpose.

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 explicitly recommends usage after deployments, PRs, or UI changes, providing clear context. However, it does not discuss when not to use the tool or mention any alternatives, though no sibling tools are available.

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