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

Annotations already indicate idempotentHint=true and readOnlyHint=false, so the description doesn't need to repeat those. The description adds genuinely useful behavioral context: the tool is paid via x402 and the exact amount/chain. It also discloses the endpoint. However, it doesn't disclose side effects beyond registration, failure behavior, or what happens to the recovery blob, which is a moderate gap.

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 has no filler. It front-loads the purpose and then gives the endpoint and payment info. Each sentence adds information. It could be improved by adding parameter semantics, but for pure conciseness it scores well.

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?

There is an output schema, so return values don't need description. The description covers purpose, endpoint, and payment. But the low schema coverage leaves parameter semantics missing and there is no mention of error cases or post-registration behavior. For a non-read tool with 4 required params, this is adequate but incomplete.

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 very low at 17% (only 'dev mode only' for agent_wallet is described in schema). The description itself adds no parameter-level meaning: it doesn't explain contact_name, quorum_rules, recovery_blob, or idempotency_key semantics beyond their names. With low coverage, the description must compensate and it doesn't.

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 verb and resource: 'register' a recovery, and clearly notes the monetization mechanism. It somewhat distinguishes the action by naming the exact endpoint and payment requirement, though it doesn't explicitly contrast with sibling tools. For a registration tool with no obvious sibling conflict, this is clear enough.

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?

It implicitly says when to use it: agents paying for work and proving what happened, with the payment requirement. It does not explicitly state when not to use alternatives or mention any sibling alternatives. The context is sufficient to understand the moment of use, but the exclusion/alternatives guidance is missing.

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