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

The description discloses that deactivation is reversible via update, indicates partial update support, and mentions bulk execution via client_ids. These go beyond the minimal annotations (readOnlyHint=false, destructiveHint=false). However, it omits details like permission requirements or error states.

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 uses bullet points and sections for actions and field types, making it scannable. It is relatively concise for the amount of information, but could be more focused on the create action given the tool name, reducing 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 11 parameters, no output schema, and multiple actions, the description is incomplete. It lacks return value information, error handling, and details on how parameters interact for bulk operations. The focus on create is diluted by inclusion of other actions without full specifications.

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?

With 0% schema coverage, the description adds meaning for key parameters: name, email, phone required for create; gender is static (m/f); groupId is dynamic per trainer. However, 7 of 11 parameters (e.g., account, lastName, birthDate, blockOverdue) remain undocumented, leaving gaps.

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 states the tool creates, updates, and deactivates students, but the tool name and 'Flattened action: create' indicate it is specifically for creation. This inconsistency with sibling tools (e.g., mfit_client_write_update, mfit_client_write_deactivate) may confuse an agent about which tool to use for which operation.

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 explicit guidance on when to use this tool versus its siblings for update or deactivate. The description implies actions exist but doesn't direct the agent to use the dedicated sibling tools for those operations. The hint to call mfit_client list_groups first is helpful but insufficient.

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