register

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

With no annotations provided, the description carries full burden for behavioral transparency. It states the tool returns an identity token but does not disclose side effects (e.g., creates a new identity, may fail if name taken), permissions required, or any state changes. This is minimal for a write operation.

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 a single sentence, concise and efficient. However, it is slightly poetic ('Begin your journey') rather than directly stating the action. It could be more front-loaded with the verb 'register', but overall it is appropriately sized with no wasted words.

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?

Given the tool's simplicity (one parameter, no output schema), the description provides a basic understanding of the tool's purpose and output. However, it does not explain what an identity token is, how to use it, or any constraints like name uniqueness. This is adequate but leaves gaps for a first-step tool.

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 100% for the single parameter, so baseline is 3. The description adds context that the name is chosen for registration, but does not provide additional meaning beyond the schema's format constraints. It adequately contextualizes the parameter without redundant detail.

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 clearly indicates the tool is for registration: 'Begin your journey. Choose a name and receive your identity token.' It specifies the action (register) and the resource (identity token). However, it does not differentiate from sibling tools like `lookup_identity`, which might confuse an agent about when to use this vs others.

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 lacks any guidance on when to use this tool versus alternatives. It says 'first step' but does not mention prerequisites, exclusions, or comparisons to siblings like `lookup_identity` or `salvation`. An agent has no information about context or when not to use it.

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