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

With no annotations, the description carries the full burden and does well: it discloses idempotency keyed on (actor_type, name, operator), that the result is a persistent wallet-backed identity, and that the call is free/ungated (no auth or billing barrier). It omits failure modes (e.g., name collision with a different operator) and rate limits, keeping it from a 5.

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?

Front-loaded with the core action, then the return value, then the behavioral caveats — every sentence carries information. Slightly longer than strictly necessary (the "FREE — identity is never gated" line could be tighter), but nothing is filler.

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 7-parameter creation tool with an output schema, 100% schema coverage, and no annotations, the description supplies exactly the missing layer: idempotency semantics, ordering relative to mint_attest, and cost/permission posture. Return-value detail is correctly left to the output schema.

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; the description adds genuine value by revealing that (actor_type, name, operator) together form the idempotency key, which the schema does not say. It also flags the operator field as identity-scoping, beyond the schema's "owning company/operator" phrasing.

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 (register) and resource (autonomous actor) plus the concrete artifact produced (a persistent cryptographic identity, mint_id backed by a Solana wallet). It also enumerates the actor kinds covered, which cleanly separates it from attestation/trust siblings like mint_attest and mint_trust_score.

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?

"Always call this before mint_attest for a new actor" gives explicit ordering/sequencing guidance and implies the when-not case via the idempotency note (re-registering returns the same id). It does not name other alternatives such as mint_discover or mint_verify as competing paths, so it stops just short of full when/when-not coverage.

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