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

The description goes well beyond the annotations by disclosing that the secret is never stored, cannot be recovered if lost, that the tool is free, and how to authenticate afterward. However, it claims the agent_key can be passed as an argument, which contradicts the schema's additionalProperties: false and the actual listed parameters, making part of the behavioral guidance unreliable.

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 purpose is front-loaded and the operational details are useful, but the description repeats 'FREE' twice, and the auth/route details could be more compact. Overall, it is reasonably structured for a credential-creating tool.

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?

The description covers return values, secret storage, cost, and authentication, which is good for a 2-parameter tool with no output schema. However, it does not clarify whether agent_id may be omitted, what happens on duplicate registration, or the exact return format, and the agent_key instruction is misleading.

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%, so the baseline is 3, but the description adds no genuinely useful parameter-level meaning and instead introduces a non-existent 'agent_key' argument. It also uses the term agent_secret for the returned credential while the schema defines an optional input parameter of the same name, which can confuse whether the secret is supplied or generated.

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 states a specific action — 'Create a durable identity for an agent' — and clarifies what is returned (agent_secret, public agent address, namespace id). This is clearly distinct from the sibling tools, which all operate on an already-registered agent for messaging, work, budgeting, or barriers.

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 first-step registration tool by saying it creates a durable identity and returns credentials, but it never explicitly states when to use it versus alternatives, whether it should be called once per agent, or what happens if an identity already exists. No exclusion or alternative guidance is provided.

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