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

The annotations already declare readOnlyHint=true, openWorldHint=false, and destructiveHint=false, so the safety profile is covered. The description adds that the result includes a real rendered view plus checker findings, but it does not describe the return format, latency, or any other behavioral trait beyond that. It does not contradict the annotations.

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 two compact sentences with the width detail front-loaded. 'Paint the page for real' is somewhat vague, but there is little wasted wording.

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 read-only visual inspection tool with no output schema, the description should clarify what 'see it' returns and how checker findings are presented. It explains width adequately but leaves the output shape and its relationship to landing_read_page incomplete.

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 description maps the width enum values to concrete meanings: phone (390), desktop (1440), or both. That adds useful pixel-level context beyond the schema. The required document_id is documented in the schema, and the description does not add further meaning for it, but the width explanation compensates for the 50% schema coverage.

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 uses the verb 'paint' and resource 'page', but 'paint the page for real and see it' is metaphorical. It implies rendering or previewing the page and retrieving checker findings, yet it does not explicitly distinguish this from sibling tools such as landing_read_page.

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 explicit when-to-use or when-not-to-use guidance, and no alternative tool is named. The phrase 'with what the checker found' hints at a post-edit visual check, but the condition for choosing this tool over landing_read_page or landing_edit_page is left to inference.

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