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

With no annotations, the description carries full responsibility for behavioral disclosure. It only mentions the free nature and the general output, but does not explain what 'content quality analysis' entails, whether the URL is fetched, or any limitations (e.g., paywall, non-HTML). It does indicate a read-only analysis, but lacks depth.

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 very short and to the point, with the French translation providing bilingual access. No filler is present, though the French phrase adds minimal informational value.

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 has only a single parameter and no output schema, the description should clarify what results to expect. It mentions readability score and content quality but not the format or criteria, leaving ambiguity about the output.

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 schema fully documents the 'url' parameter, so the description does not need to add much. The description reinforces that the URL is the target of readability analysis, but adds no additional syntax or format details beyond the schema.

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 tool provides a readability score and content quality analysis for a URL, making its core function apparent. However, it lacks an explicit verb like 'computes' or 'analyzes', and does not differentiate from sibling analysis tools beyond the name.

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 provided on when to use this tool versus alternatives such as page_speed_check or seo_score. There is no mention of prerequisites, use cases, or exclusions, leaving the agent to infer applicability.

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