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

Annotations declare readOnlyHint=false (mutating) and destructiveHint=false; the description does not contradict these. It adds genuinely useful context that the call is free and requires no wallet upfront, which is behavioral info beyond the annotations. However, it fails to disclose that registration provisions an agent identity, may auto-provision a sandbox wallet that returns a private key exactly once, and can have downstream effects — a meaningful gap for a mutating onboarding 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 brief (three short clauses) and front-loads the call-to-action, which is efficient. However, much of the content is promotional filler — emoji, 'Free — no wallet needed,' and the deepmindwatch-specific pricing — rather than durable information. It is compact but sacrifices informative content for sales messaging.

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 and the input schema is exceptionally detailed, so the description does not need to explain return values or parameters. But for a 15-parameter onboarding tool with significant side effects, the description's narrow focus on one purchase-tools scenario leaves an agent without a general understanding of the registration action's scope. The rich schema compensates substantially, making this adequate but not complete.

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 all 15 parameters are already documented in detail within the schema. Per the baseline rule, a 3 is appropriate since the schema does the heavy lifting. The description itself adds zero parameter-level information — it names no parameters at all.

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 an action ('Call register... to unlock the purchase tools') and names a specific resource context (deepmindwatch purchase tools), so the purpose is partially clear. However, it reads as a promotional pitch tied to one specific use case rather than describing what registration actually does — the schema reveals this is a full onboarding action (provisioning an owner identity, endpoint, wallet, capabilities). The generic registration function is obscured by the deepmindwatch framing.

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 only guidance is an imperative 'call this now' with no condition or alternative routing. Sibling tools like onboard_start and get_recommended_action are never mentioned, and there is no explanation of when registration is appropriate versus when it is not. The directive to 'call this now' is pushy but provides no decision criteria for the agent.

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