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

Annotations already declare readOnlyHint, openWorldHint and non-destructive, so the safety profile is covered. The description still adds real context: the checks run against live pages (matching openWorldHint), the specific conditions tested, and the default scope of the home page. Auth requirements and any rate/latency behavior are left unstated, and the output schema covers return values.

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?

Two dense sentences with zero filler. The core check is front-loaded, the sequencing prerequisite follows, and the default-scope caveat closes it out — every clause carries information an agent needs.

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?

With an output schema, full annotation coverage, and 100% schema description coverage, the description only needs to supply intent, sequencing, and scope defaults — all of which it does. Nothing required to invoke this correctly is missing.

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 baseline is 3; the description goes slightly beyond by adding the format constraint that each path must start with '/' and reconfirms the 5-path cap and home-page default in the flow of the sentence. It adds a genuine rule not present in the schema, though most parameter meaning still comes from 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?

States a specific verb and resource (verifies live pages) and enumerates exactly what is checked: one og:image, served by getwowlink, and whether crawlers already fetch the images. It also names the sibling get_install_instructions, so an agent can distinguish it from check_link_preview or check_site_previews without opening a schema.

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?

Gives explicit sequencing: 'Meant for after the tags from get_install_instructions are deployed.' That tells the agent when to reach for this tool rather than the install-instruction tool. It stops short of naming when-not to use it or which sibling to use instead for other verification needs.

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