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

Annotations declare readOnly=false, idempotent=true, destructive=false, and the description is consistent with these while adding real context: the auth requirement as the invited email, the resulting operator access, and the important note that no new token is returned so the caller keeps its own. It doesn't cover reversibility or rate limits, keeping it below 5.

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 action is front-loaded and the sentences are short, but the closing 'Requires: token of the invited email' restates the opening sentence, a small 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?

For a single-parameter tool with full schema coverage, existing annotations, and no output schema, the description supplies the preconditions, effect, and token-rotation behavior an agent needs. Nothing critical is missing, though it could note reversibility or error conditions.

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% and the token parameter is documented in detail in the schema (long random string after `token=`). The description reiterates 'token of the invited email' but adds no syntax or format meaning beyond the schema, so the baseline 3 applies.

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 (accept) and resource (delegation invitation) and explains the effect: it grants operator access to your own account. This clearly distinguishes it from sibling tools like delegate_service, list_delegations, and revoke_delegation.

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 an explicit precondition ('Requires being signed in as the invited email address') and identifies the required input source (the token from the invite link). It does not explicitly name alternatives or when-not-to-use, so it falls short of a 5.

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