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

Annotations already indicate a destructive write operation (readOnlyHint: false, destructiveHint: true). The description adds that it writes 'missing account data' and only creates an organization 'when none exists,' suggesting it fills gaps without overwriting existing values or duplicating orgs. This provides behavioral context beyond the annotations.

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 a single, efficient sentence with the critical warnings ('AUTH REQUIRED; WRITES...') front-loaded in caps. Every clause contributes to understanding the tool's purpose and usage without redundancy.

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?

Given the presence of an output schema, return-value explanation is not needed. The description covers purpose, conditions, and authentication requirements, while the schema covers parameter-specific semantics. It could be more complete by explicitly referencing account_status as the source of missing-field information, but the schema mentions this, making the tool adequately documented.

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 has 100% coverage, with each parameter explicitly describing its conditional requirement (e.g., 'Required when account_status reports lastName missing'). The main description only adds a general note about using real values, which is already echoed in the schema's bottom description. Thus, the description adds no significant meaning 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?

The description clearly states the tool's action: 'Fills missing first and last name fields and creates the first company or workspace organization when none exists.' This specific verb+resource statement distinguishes it from read-only siblings like account_status and from organization_create by noting it creates the 'first' organization.

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 description provides clear context for when to invoke: 'Invoke only with real account and organization values supplied by the user' and 'AUTH REQUIRED.' It implies conditional use when account data is missing, but it does not explicitly exclude alternative tools like account_status for checking or organization_create for additional orgs, so it lacks explicit when-not guidance.

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