get_usuario_by_email

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

No annotations are provided, so the description carries the burden. It discloses the role requirement (ADMIN or MANAGER), which is a behavioral trait. However, it does not mention whether the operation is read-only, what happens if the email is not found, or any other behavioral details. It adds minimal but important context.

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 two sentences with no redundant words. It front-loads the primary purpose and follows with the prerequisite. Every sentence earns its place.

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 simple one-parameter lookup tool with no annotations and no output schema, the description covers the core purpose and access requirement. However, it does not describe the return value or error behavior, which would be helpful since there is no output schema. Overall, it is nearly complete for its simplicity.

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 100%, so the schema already fully documents the 'email' parameter. The description does not add further semantic details (e.g., case-sensitivity, format nuances) beyond the schema, so the baseline score of 3 is appropriate.

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 ('Find'), the resource ('a user'), and the specific lookup method ('by their email address'). This distinguishes it from sibling tools like list_usuarios (list all) and get_persona (likely by ID).

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 implies when to use the tool (to find a user by email) and provides a prerequisite (ADMIN or MANAGER role), but does not explicitly mention alternatives or exclusions relative to sibling tools like list_usuarios. Usage guidance is implied rather than explicit.

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