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

Annotations cover the safety profile (destructiveHint=true), and the description adds that this is an additive write via POST /clients. However, it never addresses what happens on duplicate clients, whether the record is immediately visible to booking, or what the caller gets back, which matters for a mutation tool.

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 short, front-loaded sentences with the action first. The second sentence ('This ADDS data') is mildly redundant with 'CREATES' but usefully signals a mutation versus a read.

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 create tool with no output schema and no return-value documentation, the agent cannot tell what identifier comes back or how to verify success. The essentials (what it does, that it is a POST write) are present, but side-effect and response expectations are missing.

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% and the required fields (firstName, lastName) are already marked in the schema, so the description need not repeat them. It adds nothing about email/phone/notes semantics, so 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?

States a specific verb and resource ('CREATES a new client record in the account's client list') and even names the underlying REST operation (POST /clients). This clearly separates it from acuity_list_clients, though it does not call out that sibling explicitly.

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?

There is no guidance on when to create a client versus looking one up first (e.g., checking acuity_list_clients to avoid duplicates) or any preconditions like required account permissions. Usage is only implied by the verb.

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