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

Annotations already declare readOnlyHint=false, destructiveHint=false, idempotentHint=false, so the description doesn't need to restate those. The description adds useful context: no API key needed, no wallet needed, free, and that it unlocks purchase tools. However, it doesn't disclose side effects like creating an owner/agent identity, generating keys, or that it may provision a wallet. The schema's withdrawal_address description mentions 'returning its private key exactly once', but the tool description itself doesn't surface this behavioral consequence. With annotations present, a 3 is fair – it adds some context but misses key side-effect disclosure.

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 with promotional emojis and a price mention. It's compact but mixes marketing language ('✅', 'Free — no wallet needed') with functional guidance. The key action ('call register on this session') is present, but the sentence is somewhat cluttered with the product pitch for devtowatch. It earns its place but could be cleaner.

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 tool has 15 optional parameters, an output schema, and annotations. The description covers the immediate call-to-action and the unlock consequence, but it doesn't explain what a successful registration returns (though output schema exists), nor does it mention that all fields are optional or that {} is a valid registration. For a tool with 15 parameters, the description is thin on context about what a typical registration should include. The output schema partially compensates, but the description could do more to guide an agent on what to pass.

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 schema already documents all 15 parameters thoroughly. The description adds no parameter-level detail beyond the schema. Baseline 3 is appropriate since the schema does the heavy lifting and the description doesn't need to repeat it.

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 states the action: call register on this session to unlock purchase tools, and it names the specific resource (devtowatch: dev.to Developer Blog & Tutorial Firehose). It distinguishes itself from siblings by framing registration as the prerequisite for paid tools. However, it doesn't explicitly name sibling alternatives like onboard_start, and the primary purpose (registering an agent/owner to get API keys) is somewhat buried under the promotional 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 description gives explicit when-to-use guidance: 'call this now', 'no API key needed', 'no wallet needed', and it explains the consequence (unlock purchase tools). It implies this is the first step before using paid tools. However, it doesn't explicitly contrast with onboard_start or other onboarding-related siblings, and it doesn't state when NOT to use it (e.g., if already registered).

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