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

Annotations already indicate this is not read-only, not idempotent, and not destructive. The description adds the bulk-execution behavior, which is useful context. It does not disclose auth requirements, rate limits, or side effects, but the annotation coverage lowers the burden somewhat.

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 description is short, but the first sentence ('Create Service Account Api Key') largely repeats the tool name and adds little value. The second sentence and bulk note are useful, so it is concise but not optimally structured.

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?

With 8 parameters, no output schema, and no parameter descriptions, the description is insufficient for an agent to confidently invoke the tool. It does not explain required permissions, the meaning of fields like allowed_ips or character_limit, or what the response contains.

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 0%, and the description only adds meaning for one parameter (service_account_user_ids for bulk execution). The other seven parameters—including required ones like permissions and name—are left entirely to the schema, which lacks descriptions.

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?

The description clearly states the action: 'Create a new API key for a service account.' This distinguishes it from service-account creation and key deletion/editing, though it does not explicitly name sibling alternatives.

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?

The bulk support note ('accepts service_account_user_ids for batched execution') provides some usage guidance for batched vs. single execution. However, there is no explicit guidance on when to prefer this tool over related tools like elevenlabs_edit_service_account_api_key or elevenlabs_delete_service_account_api_key.

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