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

Beyond the read-only annotations, it discloses state-dependent returns, the security-sensitive one-time setup link, that the first opener becomes admin and creates a passkey, and that later sign-in is by passkey with teammate invites from inside the admin. This is precisely the behavioral context an agent needs before handling or sharing the returned link.

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?

The description is compact and front-loads the purpose, then explains the pre-setup and post-setup states in order. Every clause carries useful information, though the opening 'How the user gets into...' is slightly less direct than a verb-first statement.

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 no output schema, the description does a good job explaining what is returned in each state and the passkey/invite workflow. However, it leaves the required projectId input unexplained, which is a meaningful gap for an agent that must supply that value.

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?

The sole required parameter, projectId, has 0% schema description coverage and the description never explains what it identifies, its format, or how to obtain it. The phrase 'a published EmDash site's CMS admin' implies a project/site association, but it does not add concrete meaning beyond the schema field name.

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 states a clear outcome and resource: it returns either the one-time SETUP link before first sign-in or the admin address after setup for a published EmDash site's CMS admin. It is more specific than a tautology and an agent can infer the purpose, but it does not explicitly distinguish this tool from close siblings such as uichemy_open_site_admin or uichemy_site_admin_login.

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 provides clear usage context by explaining the before-first-sign-in vs after-setup states and warns 'give it only to the user' because the first opener becomes admin. It lacks explicit exclusions or an alternative-tool routing sentence for the similarly named admin/login siblings, so it stops short of full when-to-use guidance.

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