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

With no annotations, the description carries the full burden and delivers real behavioral detail: output is plain editable HTML/CSS/JS, pages run sandboxed with settings kept in memory only, runs on sample data out of the box, and cost is 2 credits per call. It stops short of documenting permissions, persistence, or return/publish side effects.

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 dense paragraph that is front-loaded with the core action and hosting outcome, then layers layouts, themes, features, and integration details. It is information-rich for such a complex tool, though mildly run-on.

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 14-param, nested-object tool with no annotations and no output schema, the description covers purpose, layout/theme options, API wiring, output format, sandbox limitations, and cost. It is nearly complete for correct invocation, with the main gap being semantics for the less-prominent configuration parameters and no clear routing away from siblings.

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 low (36%) across 14 parameters, so the description must compensate. It explains the meaning of the key integration params (api_base_url, data_url, chat_endpoint) and their expected payloads, but leaves accent, nav_items, publish, site_id, default_mode, and the nested dashboard/crud/chat objects to the bare 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 – 'Build a polished, responsive front end for an app and host it instantly' – and enumerates the three layouts and four themes it produces. An agent can distinguish it from adjacent siblings like site_create or site_deploy, which do not generate themed app UIs.

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 clear context: layout-specific wiring (crud via api_base_url, dashboard via data_url, chat via chat_endpoint) and names site_files for editing the output. It also flags cost and sandboxed hosting. However it never explicitly states when to prefer this over site_create/site_deploy, so no true exclusions are provided.

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