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

Annotations already declare the mutation/idempotent/destructive profile, and the description adds genuinely new context: it requires an account token, works on both the free link and a custom domain, and does not charge. It stops short of explaining why the operation is flagged destructive (e.g., that an empty password exposes the site), but the added auth and scope notes are real value.

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?

Four short sentences, with the auth precondition front-loaded in parentheses and no filler. Each clause conveys a distinct fact, though the empty-password and scope notes could be tightened into fewer lines.

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 2-parameter mutation with full schema coverage and annotations covering the safety profile, the description is close to complete: it discloses auth needs, behavioral effect of empty input, and scope. The one omission is the relationship to clear_site_password, which an agent would benefit from knowing.

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 coverage is 100%, so both parameters are already documented, and the description largely echoes the schema's own 'empty makes the site public' wording. The domain/free-link scope note is mildly additive but does not extend parameter syntax or format. Baseline 3 is appropriate when the schema carries the load.

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: it sets a visitor-facing password that gates a claimed site before it opens. The scope is clear. However, it never distinguishes itself from the sibling clear_site_password, and the 'empty password makes the site public' clause actually overlaps with that sibling's job, leaving a routing ambiguity.

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?

Usage is implied (protect a site with a visitor password) and the empty-password behavior is noted, but there is no explicit when-to-use or when-not-to-use guidance and no mention of clear_site_password as the alternative for removing a password. The agent must infer the boundary from sibling names alone.

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