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

With no annotations, the description must stand alone, and it does add useful operational context by requiring prior authentication and explaining the retry step. It does not disclose side effects (e.g., is_primary behavior), whether creation is idempotent, or what the success/error contract looks like.

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 action is stated in the first sentence, and the access note is a separate short block. There is no filler, and each sentence contributes either the purpose or a critical precondition.

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?

The description includes the key gating information (account needed, authentication flow) and a high-level field summary, which is meaningful. However, with no output schema and no annotations, it leaves out return values, error behavior, and profile management semantics, so an agent still has to infer several important calling details.

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?

The input schema already describes all 8 parameters (100% coverage), so the baseline is 3. The description only groups the parameters into categories and adds no semantics beyond the schema, such as constraints or interactions between is_primary, is_public, and is_business.

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 opens with 'Create a new profile' and names the supported payload areas (display name, bio, avatar, business info, theme settings), giving a specific verb, resource, and scope. The word 'new' distinguishes it from profile-update and profile-deletion siblings.

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 clearly states the access precondition (Proof account, authenticate the client) and warns that start_login does not open the tool, which prevents a known wrong workflow. However, it never says when to choose create_profile over related tools like update_profile, set_primary_profile, or list_profiles.

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