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

Annotations already cover mutability and non-idempotency, so the description's value is the auth constraint (personal key only) and the domain consequence of teams as escalation targets that reach every current member. It does not say what happens on duplicate names despite the schema warning about uniqueness.

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?

Three short sentences, mutation intent front-loaded, with auth requirement and semantics following. Each sentence carries information; nothing redundant.

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 non-destructive, non-idempotent create with a fully described two-parameter schema and no output schema, the definition covers the key risk (key type) and the meaning of the created entity. It leaves the identifier of the returned team unstated, which the agent would need for follow-up calls.

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 are already documented, including the list_members dependency for membership_ids. The description only restates that members are optional at creation, adding no format or edge-case detail beyond the schema baseline.

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?

States a specific verb and resource ('Create a team') and adds scope ('optionally with its first members'), which distinguishes it from create-plus-set_team_members flows among the siblings. It stops short of naming a sibling, so it lands just under the top band.

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?

Gives a concrete precondition for use: a personal API key is required and organization keys cannot manage teams. It does not spell out when to prefer this over create_agent or how team creation relates to escalation-policy setup, so a clear context but no exclusions.

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