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

Annotations already declare readOnlyHint=false and destructiveHint=true, so the mutation/destructive profile is covered. The description usefully adds the merge semantic ('Only provided fields will be updated'), but says nothing about what a partial update does to nested objects, whether overwriting customEvaluations or excludedDataAndTopics is recoverable, or what the response contains.

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, front-loaded sentences with no filler. The scope statement comes first and the merge caveat second; every clause earns its place.

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 three-parameter settings mutation with 100% schema coverage and no output schema, the description plus annotations plus schema give an agent enough to invoke correctly. The merge caveat is the key behavioral detail and it is supplied.

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 every nested field is documented in the schema, so baseline 3 applies. The description adds no parameter-level meaning and does not clarify the ambiguous merge behavior for the nested 'general' and 'optimization' objects.

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?

Specific verb + resource ('Update account settings') clearly states the operation, and the partial-update clause adds scope. It never names the sibling get_settings or the update_agent/update_webhook/update_persona peers, so an agent must infer the boundary itself.

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?

No when-to-use guidance, no mention of the read counterpart get_settings, and no prerequisites or permission context. The superadmin-only nature of customerId is disclosed only inside the schema, not in the description.

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