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

Annotations already flag destructiveHint=true and openWorldHint=true, and the description adds genuinely new behavioral context: it consumes the account's WebTwizz credits, each call starts a distinct new change, and the work is shown live on the card. It stops short of saying whether changes are reversible or what happens on failure, and does not mention restore-version as a recovery path.

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?

Three sentences, front-loaded with the trigger condition, and the credit/one-change-per-call facts come before the mechanism description. Minor redundancy between 'which edits the site' and the change examples, 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?

With an output schema present, return values need no explanation, and the annotations plus description together cover safety, cost, and live-progress behavior. The main remaining gap is failure/reversibility guidance for what is a destructive, credit-consuming operation.

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 description coverage is 100%, so all five parameters (files, images, request, site_id, reference_url) are already documented with meaningful prose. The description adds no parameter-level detail such as when to prefer files over images or how reference_url interacts with request, so the baseline 3 applies.

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 a clear verb-plus-resource framing ('change one of their WebTwizz sites') and enumerates concrete change types (sections, pages, copy, design, features, fixes, answering a pending question). It explains the mechanism (request routed to the site's WebTwizz AI), which distinguishes it from low-level siblings like edit-element/edit-text. It does not, however, explicitly name those siblings or update-site/update-site-data as alternatives.

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?

'Use this when the user wants to change...' gives an explicit trigger condition, and the inclusion of 'an answer to a question WebTwizz asked' widens the context usefully. There are no stated exclusions or named alternatives (edit-element, edit-text, update-site), so the agent must infer routing when a change is element-level.

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