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

With no annotations, the description carries the full behavioral burden and does so well: it discloses that this is a write admission, the exact cost and payment mechanisms (x402 USDC on Base, Cashu NUT-24/Lightning L402), that refusals happen before payment, and that the NIP-05 bundle is free. This is unusually rich disclosure for a mutation tool.

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?

Purpose and price are front-loaded, and each clause earns its place (payment, bundle, refusal, free check). It is dense and the raw status URL is slightly awkward, but there is little padding.

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 mutation tool with no annotations and no output schema, the description covers payment, prerequisites, refusal conditions, and the identity bundle. It stops short of describing the successful response or reversibility, but is otherwise sufficient to call correctly.

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 coverage is 100%, so the baseline is 3, but the description adds real meaning: 'add name= to also register name@automatom.matt-d59.workers.dev as your NIP-05 identity' explains the effect and cost of the name parameter and ties the relays param to the NIP-05 record. It goes beyond the terse schema text.

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?

Names a specific verb+resource+scope: one-time write admission to a named Nostr relay for a hex pubkey, and clarifies that reads are free. An agent immediately knows this is a paid admission/mutation tool rather than a generic relay operation.

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?

Gives strong context: two payment rails with exact prices, a free pre-check endpoint, and the fact that already-admitted pubkeys or taken names are refused before payment. It does not explicitly name the sibling nip05_register as the alternative for identity-only registration, so the when-to-use-this-vs-that differentiation is implied by the bundle clause rather than stated.

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