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

Beyond the annotations (openWorld, not read-only, not destructive), it discloses genuinely new traits: everything published is public, no server code runs, the link expires in 24 hours unless a hello.new account is connected, and the returned id/key are needed for future updates. These are exactly the consequences an agent needs before acting.

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 tight sentences, front-loaded with what the tool does, then the credential handoff, then the constraints. Every clause carries information; nothing is padding.

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 not be explained, and the description covers everything else an agent needs: static-only constraint, public exposure, expiry behavior, and the alternative tool for edits.

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 files/title/expires_in are already fully documented in the schema, including the index.html convention and 100-file/10MB limits. The description mirrors the expiry default rather than adding new parameter meaning, so the baseline 3 is appropriate.

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 names a specific verb (publish) and resource (a website built from HTML/CSS/JS/images) served at its own public URL. It distinguishes itself from the sibling update_site by explaining that id and key are kept specifically to change the site later.

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?

It gives clear context for use (a static site the user built that others should visit) and routes modification to update_site. It does not state when *not* to use it, e.g. when a dynamic/server-backed app is needed, though the 'static files only' line partly covers this.

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