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

Annotations already declare readOnlyHint=true and destructiveHint=false, and the description is consistent with that, adding that it 'opens nothing by itself.' It also discloses what the response contains (screens, buttons, fields), which is behavior beyond what the annotations convey. It stops short of covering failure modes or what the instructions look like when the account state differs.

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 core purpose and handoff are front-loaded and easy to act on, but 'from ChatGPT, Claude or any AI agent' is promotional filler and the closing note about Acuity's REST API and a dated verification checklist is metadata that does not help an agent invoke the tool.

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 parameterless, non-mutating guidance tool with no output schema, the description covers what it does, what it returns, and what to do next, which is close to sufficient. Prerequisites such as an authenticated browser session and how to recover if the described screens don't match are the remaining gaps.

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?

With zero parameters and 100% schema coverage there is nothing to disambiguate, so the baseline applies. The description does not need to add parameter meaning and correctly spends its words on the return contract instead.

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 ('Block off time in the user's own Acuity Scheduling account') and makes the key distinction that it returns instructions rather than acting, which separates it from a true execution tool. It does not explicitly contrast itself with the appointment-manipulating siblings, but the resource/action pair is distinct enough to route correctly.

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 a clear two-step workflow: call this to get steps, then perform the action with cotlet_browser_* tools in the Cloud Browser. It offers no when-not guidance, no prerequisites (e.g. the user must be signed in), and no explicit statement about which sibling to use if the user actually wants an appointment moved rather than time blocked.

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