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

With no annotations, the description carries the full burden and delivers: one-shot deterministic retrieval, draining only the pinned rendezvous relay, deletion/NACK of mismatched DMs (a destructive side effect), non-disclosure of the expected phrase, and the returned grant envelope. It also states the calling-app obligation to persist and reuse the new dpop_token.

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?

Content is front-loaded (what it is, then the critical timing constraint, then mechanics) and every paragraph carries real information. It is on the verbose side and repeats the flow relationship, but the length is justified by the complexity of the exchange.

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 no-annotation, multi-step cryptographic exchange this is complete: timing rules, relay behavior, error handling, and the downstream obligation on the returned token are all covered. The output schema exists, yet the description still usefully explains the semantic value of the returned dpop_token.

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% and both schema descriptions already document dpop_token and patron_npub, so the baseline is 3. The description reinforces the naming pair (patron_npub, dpop_token) and the origin of dpop_token, but adds little syntax or format detail beyond the schema.

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?

States a specific verb+resource (receive npub ownership confirmation) and explicitly positions itself in a named flow (npub-OWNERSHIP-PROOF), distinguishing its credential-delivery counterpart (receive_credentials) and its initiating sibling (request_npub_proof). An agent can pick it out of the large sibling list without opening any schema.

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 explicit when-to-use (only after the user confirms they have replied) and when-not (if called before the user replies the message is never found), plus a firm prohibition on polling, looping, and retrying. It also names the alternative flow (receive_credentials) for the credential case.

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