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

Annotations declare destructive/non-idempotent/open-world, and the description goes well beyond them by spelling out exactly what is destroyed: the link is single use, it expires, and the acting session_token stops working afterwards. It even explains the intent ('which is the point'), which is genuinely useful for an agent weighing whether to call it.

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 tight sentences, no filler; the mechanism comes first, then the lifecycle constraints, then the timing advice. Every sentence carries distinct information.

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?

With only two required string parameters and no output schema, the description covers the full decision surface: what it creates, that it is one-shot and expiring, and the irreversible side effect on the session. Nothing an agent needs before calling it is missing.

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% and both parameters are self-describing (session_token 'returned by create_tournament', tournament_id). The description adds no parameter-level detail, 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 and artifact ('make a link that hands this tournament to a person'), plus the concrete flow that follows (recipient sets email/password and takes over the account). No sibling tool covers handoff, so it is unambiguously distinct from create_tournament, publish_tournament, and the get/list tools.

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 explicit timing guidance: hand it over when the tournament is ready, not while still building. It does not need to name an alternative because no sibling performs a similar function, but it stops short of stating prerequisites or what happens if invoked early.

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