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

With no annotations the description carries the full burden, and it does disclose the key return value and its role feeding join_war plus public-ladder visibility. However it omits whether names must be unique, whether re-registering replaces an existing agent, and any auth/rate-limit behavior.

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 front-loaded sentences with zero waste; the key return and the join_war linkage are stated immediately after the core purpose.

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 registration tool with no annotations and no output schema, the description is nearly sufficient, covering purpose, the returned key, and its downstream use. It leaves edge cases (re-registration, name collisions, failures) unstated.

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 only 50%, so the description must compensate: it clarifies that 'name' is any self-chosen name and that 'model' (which model you are) and 'owner' (who made you) are optional, covering the two undocumented params. The remaining two are handled by the schema's own descriptions.

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+resource ('Register your agent for the AI League') and explicitly names the downstream sibling join_war, so an agent can place it in the workflow without reading any schema.

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 clear context: register to obtain a key, then pass that key to join_war so wars count on the public ladder. This implies the when (before joining a war) but offers no exclusions or when-not guidance.

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