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

Annotations already declare destructiveHint=true and readOnlyHint=false, so the safety profile is covered. The description adds genuinely useful merge semantics ('Only provided fields will be updated'), clarifying that this is a partial rather than full replacement. It says nothing about what is destroyed, permission requirements, or the superadmin-only customerId path.

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?

Two short sentences with zero waste, and the core action is front-loaded. It is appropriately sized for a brief mutation tool, though it leans toward under-specification rather than tight conciseness.

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 destructive tool with deeply nested settings objects, a superadmin-only customerId field, and no output schema, the description is too thin: it omits permission requirements, the implications of the destructive hint, and how the general/optimization blocks interact.

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%, including rich nested documentation for general and optimization settings, so the schema carries the parameter burden and the baseline is 3. The description's merge statement adds payload-level meaning but no per-parameter detail beyond the schema.

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 ('Update account settings'), which is clear enough to separate from read-only siblings like get_settings. It does not, however, distinguish itself from the other mutating siblings (update_agent, update_persona, update_webhook) or clarify the scope of 'account'.

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 when-to-use guidance, no prerequisites, and no named alternative. The only supporting sentence is about merge behavior, which is a behavioral trait rather than usage guidance, leaving the agent to infer when this tool is appropriate.

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