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

No annotations are provided, so the description carries the full transparency burden. It discloses the prerequisite call and connection targeting, but omits important behavioral details such as email verification requirements, duplicate email handling, password policy, or permission requirements. These gaps are significant for a create operation.

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 three sentences, each adding distinct value: purpose, prerequisite/targeting, and cost. There is no redundancy or filler.

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 5-parameter create tool with an output schema, the description covers purpose, prerequisite, and targeting logic. It does not explicitly mention potential error cases or uniqueness constraints, but the schema adequately covers parameter details, making the description reasonably complete.

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 coverage is 100%, so each parameter is already described. The description adds contextual value by explaining that clerk_instance_id comes from clerk.get_connected_accounts and that omitting it uses the default account, which augments the schema's basic 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 'Create a user in a connected Clerk application,' using a specific verb and resource. This distinguishes it from sibling create tools like create_email_address or create_invitations by focusing on the user object 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?

It explicitly instructs to call clerk.get_connected_accounts first and explains how to use clerk_instance_id to target a specific connection or default to the default account. This provides clear contextual usage, though it does not mention explicit alternatives or when not to use this tool.

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