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

With no annotations, the description carries the full burden, and it does disclose two real behaviors: the operator-key auth requirement and the side effect that setting email triggers a verification email. It stops short of saying whether the update is partial or replacing, whether the new email is inactive until verified, or what the response contains.

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?

One sentence plus a short auth caveat, both front-loaded, with zero filler. The fields and the prerequisite appear before anything else.

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 two-parameter mutation with no annotations and no output schema, the description covers auth and the email side effect, which is the minimum an agent needs. It omits the all-optional/empty-call behavior and the effect of the update on unmentioned fields, leaving real gaps.

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 both parameters and the verification-link behavior are already documented in the schema; the description largely restates that. Baseline 3 applies since the schema does the semantic work and the description adds no format or constraint detail.

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?

Specific verb plus resource ('Update operator profile') with the two mutable fields named. It is clear what the tool does, but it never distinguishes itself from the nearby profile-setting sibling board_set_profile, so an agent must infer which profile surface it targets.

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 'REQUIRES OPERATOR KEY' line establishes a precondition, which implies when the tool is callable, but there is no explicit when-to-use vs alternative and no statement that at least one field must be supplied (required is empty). Usage is inferable rather than stated.

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