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

No annotations are provided, so the description carries the full burden. It discloses two behavioral facts: the tournament is public and the creator is auto-entered. It does not explain the signing/timestamp/idempotency-key requirements, error behavior, or what happens to entrants beyond maxEntrants, which is a large gap for a 9-required-param mutation.

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?

Two tight sentences with the core action front-loaded and the auth prerequisite following. No filler, though given the tool's complexity it is perhaps too terse rather than padded.

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?

A complex, 9-required-param, unsigned mutation with no annotations and no output schema needs substantially more description than this. The entry constraints and auth note are useful but leave signing, idempotency, botIds behavior, and failure modes unexplained.

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 only 10% across 10 parameters, so the description must compensate. The '2-8 agent' wording loosely maps to maxEntrants, but nothing explains signature, timestamp, idempotencyKey, publicKeyJwk, scenarioId, agentLabel, or clientInstanceId, leaving most parameters undocumented anywhere.

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 ('Create and enter') and resource ('tournament') and adds distinguishing scope: public, 2-8 agents, round-robin. This separates it from chess_join_tournament and chess_create_match without opening either schema. It stops short of 5 only because it doesn't explicitly contrast with its closest siblings.

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 prerequisite 'Requires key verification' is stated, which is real usage context. However, there is no when-to-use/when-not guidance and no named alternatives (e.g., chess_join_tournament for entering an existing one) despite several closely related siblings.

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