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

Annotations already declare destructiveHint=true and idempotentHint=true, and the description adds real value beyond them: scripts, forms and event handlers are stripped from the input, and the whole page is replaced (until then the site page may be auto-generated). It doesn't say what happens on failure or whether the page goes live immediately, keeping it from a 5.

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 sentences, front-loaded with the action and the page list; the parenthetical about stores asking for a deletion page is useful rather than filler. Slightly dense and clause-heavy, but nothing is redundant with the schema.

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 destructive write with full annotation coverage and a fully documented schema, the description supplies the missing behavioral and content-quality guidance (sanitization, data-source tool, contact email). Only minor gaps remain, such as whether the site must already exist and when the new page takes effect.

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 earns extra credit by explaining why delete_account matters ('both stores ask for this page when an app has accounts') and stating Markdown is the default format, which the enum description also notes. It adds semantic meaning to the page choices beyond bare enum labels.

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 ('Replace one of your site's pages with new content') and then enumerates exactly the four page kinds the enum allows, so an agent knows precisely what this tool does and how it differs from get_page (read) and update_site (site settings). The scope is unambiguous without opening the 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 concrete context for correct use: base the content on what the app actually does and collects, consult get_app_privacy for store privacy data, and include a contact email. It never states when-not-to-use or contrasts with update_site/create_site, so it stops short of a 5.

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