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

Annotations already declare destructive=true, idempotent=true and openWorld=true, so the safety profile is covered; the description adds genuinely new context — that files are replaced wholesale, that every page is validated against rules, and what is returned (view address, problems, edit link). It omits that a valid editKey is required to make changes and that the 40-file cap applies.

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?

A single front-loaded sentence that moves from action to side effect to return values with no filler. The closing phrase 'the link the person opens to keep it' is slightly oblique, but nothing is wasted.

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?

Return values are described, which compensates for the absent output schema, and the create-then-validate flow is clear. However, with three required parameters at 0% description coverage and no mention of the editKey requirement or file-count limit, an agent still lacks enough to call it confidently on a first attempt.

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?

Top-level schema coverage is 0%: websiteId and editKey have patterns but no prose, and the description says nothing about either. Only nested path/content/encoding carry their own schema descriptions. The description never explains that editKey is the write credential, which is exactly the semantics an agent needs.

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 (saves or replaces website files) plus a post-condition (validates every page against the rules), and anchors itself to the sibling start_website. An agent can distinguish it from delete_website_file and read_website_file without opening any 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?

The phrase 'files on a website started with start_website' implies the prerequisite and ordering, but there are no explicit when-to-use/when-not statements and no reference to the sibling tools that edit or remove individual files. Usage is inferable rather than stated.

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