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

Annotations already declare idempotentHint=true, destructiveHint=false, and openWorldHint=false, so safety and repeat-call behavior are covered. The description adds a meaningful auth requirement (root-key signature) beyond the annotations, but does not explain effects, failure modes, or what happens if the creator already exists.

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?

A single short sentence with the action and key constraints front-loaded. There is no redundant or filler text.

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 described. Still, for a registration tool whose only parameter is an unconstrained nested object, the description is thin: it gives the kind and signing requirement but not enough payload structure or registration semantics for an agent to confidently construct the object.

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?

There is one opaque free-form object parameter with 0% schema description coverage, so the description must compensate. It reveals two important payload semantics—the kind value and the root-key signature—but does not enumerate the remaining fields expected in the nested object.

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 uses a specific verb (register) and resource (creator), and names the kind identifier m2m-arena/creator/v1, which distinguishes it from register_strategy. It stops short of explicitly contrasting with any sibling, so it is clear but not fully sibling-differentiated.

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 purpose implies when to use it—registering a creator—and adds the prerequisite that the payload must be signed by the root key. However, it offers no explicit when-not guidance or comparison to alternatives such as register_strategy.

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