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

It adds useful behavioral details beyond the annotations: no API key needed, no wallet needed, free upfront, and a per-query cost of 0.01 USDC. It does not disclose side effects such as creating a registration/onboarding record, issuing credentials, or any state change, which matters given idempotentHint=false and readOnlyHint=false. No contradiction with annotations.

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 and front-loaded with the most decision-relevant information: free, no wallet needed, call now. Some marketing filler (✅, repeated 'call this now') is unnecessary, but the overall length is appropriate and the core message is immediately clear.

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 15-parameter tool with no required parameters, the description is light: it never states that all fields are optional, that {} is valid, or what kind of result the agent should expect. The rich schema and presence of an output schema compensate for some of this, but the description alone leaves gaps about the registration's effects and how to invoke it minimally.

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?

The input schema covers 100% of the 15 parameters, each with detailed descriptions, so the description does not need to repeat parameter meanings. It adds no parameter-level guidance (e.g., which fields to set for a minimal registration), but the schema already provides enough for invocation; baseline 3 applies.

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 and outcome: calling register on this session unlocks the purchase tools for CISA KEV (kevwatch) at 0.01 USDC/query. It clearly identifies a verb, resource, and purpose, though it does not explicitly distinguish register from siblings like onboard_start or a2awire_guide.

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 gives a clear trigger—call this now, no API key or wallet needed—and tells the agent what it unlocks. However, it provides no exclusions or comparisons to alternative tools, so the agent gets only implied usage guidance rather than explicit when-to-use vs. when-not-to-use direction.

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