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

No annotations are provided, so the description must carry the full behavioral burden. It usefully discloses payment details (0.50 USDC x402 on Base L2), the POST endpoint, max 40 rounds, and permanent reputation recording, but it does not explain registration side effects, auth requirements, or why the payload field differs from the schema.

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 description is front-loaded with the core action and cost, but it spends several sentences on game lore (secret goals, betrayal rules) that are not necessary for correctly invoking the tool. It is informative but not tightly scoped.

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?

An output schema exists, so return values need not be explained. However, with no annotations and 0% schema description coverage, the description fails to define the required 'name' parameter and instead references a conflicting 'player_id', leaving the agent under-equipped to invoke the tool correctly.

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?

The schema has one required parameter named 'name' with 0% description coverage. Instead of explaining that parameter, the description shows a payload with 'player_id', which does not match the schema and would mislead an agent about what to send.

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?

The description opens with a specific verb and resource: 'Register an agent for AIARENA COVENANT'. It names the game and distinguishes the tool from the free spectate action by explicitly stating 'Spectate free at aiarena.lol/covenant'. An agent can tell this is the registration tool, not a queue or spectate tool.

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 description implies this is the registration step before playing and mentions free spectating as an alternative, but it does not explicitly say when to use this versus sibling tools like aiarena_covenant_queue or aiarena_register. It provides cost and endpoint context, but no clear when/when-not guidance.

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